Subrahmanyan Chandrasekhar FRS (//;
Chandrasekhar worked on a wide variety of physical problems in his lifetime, contributing to the contemporary understanding of stellar structure, white dwarfs, stellar dynamics, stochastic process, radiative transfer, the quantum theory of the hydrogen anion, hydrodynamic and hydromagnetic stability, turbulence, equilibrium and the stability of ellipsoidal figures of equilibrium, general relativity, mathematical theory of black holes and theory of colliding gravitational waves. At the University of Cambridge, he developed a theoretical model explaining the structure of white dwarf stars that took into account the relativistic variation of mass with the velocities of electrons that comprise their degenerate matter. He showed that the mass of a white dwarf could not exceed 1.44 times that of the Sun – the Chandrasekhar limit. Chandrasekhar revised the models of stellar dynamics first outlined by Jan Oort and others by considering the effects of fluctuating gravitational fields within the Milky Way on stars rotating about the galactic centre. His solution to this complex dynamical problem involved a set of twenty partial differential equations, describing a new quantity he termed 'dynamical friction', which has the dual effects of decelerating the star and helping to stabilize clusters of stars. Chandrasekhar extended this analysis to the interstellar medium, showing that clouds of galactic gas and dust are distributed very unevenly.
Chandrasekhar studied at Presidency College, Madras (now Chennai) and the University of Cambridge. A long-time professor at the University of Chicago, he did some of his studies at the Yerkes Observatory, and served as editor of The Astrophysical Journal from 1952 to 1971. He was on the faculty at Chicago from 1937 until his death in 1995 at the age of 84, and was the Morton D. Hull Distinguished Service Professor of Theoretical Astrophysics.
Chandrasekhar married Lalitha Doraiswamy in September 1936. He had met her as a fellow student at Presidency College, Madras. Chandrasekhar was the nephew of C. V. Raman, who was awarded the Nobel Prize for Physics in 1930. He became a naturalized citizen of the U.S. in 1953. Others considered him as warm, positive, generous, unassuming, meticulous, and open to debate, as well as private, intimidating, impatient and stubborn regarding non-scientific matters, and unforgiving to those who ridiculed his work.
Early life and education
Chandrasekhar was born on 19 October 1910 in Lahore, Punjab, British India (now Pakistan) in a Tamil Brahmin family, to Sitalakshmi (Divan Bahadur) Balakrishnan (1891–1931) and Chandrasekhara Subrahmanya Ayyar (1885–1960) who was stationed in Lahore as Deputy Auditor General of the Northwestern Railways at the time of Chandrasekhar's birth. He had two elder sisters, Rajalakshmi and Balaparvathi, three younger brothers, Vishwanathan, Balakrishnan, and Ramanathan and four younger sisters, Sarada, Vidya, Savitri, and Sundari. His paternal uncle was the Indian physicist and Nobel laureate C. V. Raman. His mother was devoted to intellectual pursuits, had translated Henrik Ibsen's A Doll's House into Tamil and is credited with arousing Chandra's intellectual curiosity at an early age. The family moved from Lahore to Allahabad in 1916, and finally settled in Madras in 1918.
Chandrasekhar was tutored at home until the age of 12. In middle school his father would teach him Mathematics and Physics and his mother would teach him Tamil. He later attended the Hindu High School, Triplicane, Madras during the years 1922–25. Subsequently, he studied at Presidency College, Madras from 1925 to 1930, writing his first paper, "The Compton Scattering and the New Statistics", in 1929 after being inspired by a lecture by Arnold Sommerfeld. He obtained his bachelor's degree, B.Sc. (Hon.), in physics, in June 1930. In July 1930, Chandrasekhar was awarded a Government of India scholarship to pursue graduate studies at the University of Cambridge, where he was admitted to Trinity College, Cambridge, secured by R. H. Fowler with whom he communicated his first paper. During his travels to England, Chandrasekhar spent his time working out the statistical mechanics of the degenerate electron gas in white dwarf stars, providing relativistic corrections to Fowler's previous work (see Legacy below).
In his first year at Cambridge, as a research student of Fowler, Chandrasekhar spent his time calculating mean opacities and applying his results to the construction of an improved model for the limiting mass of the degenerate star. At the meetings of the Royal Astronomical Society, he met E. A. Milne. At the invitation of Max Born he spent the summer of 1931, his second year of post-graduate studies, at Born's institute at Göttingen, working on opacities, atomic absorption coefficients, and model stellar photospheres. On the advice of P. A. M. Dirac, he spent his final year of graduate studies at the Institute for Theoretical Physics in Copenhagen, where he met Niels Bohr.
After receiving a bronze medal for his work on degenerate stars, in the summer of 1933, Chandrasekhar was awarded his PhD degree at Cambridge with a thesis among his four papers on rotating self-gravitating polytropes, and the following October, he was elected to a Prize Fellowship at Trinity College for the period 1933–1937.
During this time, Chandrasekhar made acquaintance with British physicist Sir Arthur Eddington. In an infamous encounter at the Royal Astronomical Society in London in 1935, Eddington publicly ridiculed the concept of the Chandrasekhar limit. Although Eddington would later be proved wrong by computers and the first positive identification of a black hole in 1972, this encounter caused Chandrasekhar to contemplate employment outside the UK. Later in life, on multiple occasions, Chandrasekhar expressed the view that Eddington's behavior was in part racially motivated.
Career and research
In January 1937, Chandrasekhar was recruited to the University of Chicago faculty as assistant professor by Otto Struve and President Robert Maynard Hutchins. He was to remain at the university for his entire career, becoming Morton D. Hull Distinguished Service Professor of Theoretical Astrophysics in 1952 and attaining emeritus status in 1985. In 1953, he and his wife, Lalitha Chandrasekhar, took American citizenship. Famously, Chandrasekhar declined many offers from other universities, including one to succeed Henry Norris Russell, the preeminent American astronomer, as director of the Princeton University Observatory.
Chandrasekhar did some work at Yerkes Observatory in Williams Bay, Wisconsin, which was run by the University of Chicago. After the Laboratory for Astrophysics and Space Research (LASR) was built by NASA in 1966 at the University, Chandrasekhar occupied one of the four corner offices on the second floor. (The other corners housed John A. Simpson, Peter Meyer, and Eugene N. Parker.) Chandrasekhar lived at 4800 Lake Shore Drive after the high-rise apartment complex was built in the late 1960s, and later at 5550 Dorchester Building.
World War II
During World War II, Chandrasekhar worked at the Ballistic Research Laboratory at the Aberdeen Proving Ground in Maryland. While there, he worked on problems of ballistics, resulting in reports such as 1943's On the decay of plane shock waves, Optimum height for the bursting of a 105mm shell, On the Conditions for the Existence of Three Shock Waves, and The normal reflection of a blast wave. Chandrasekhar's expertise in hydrodynamics led Robert Oppenheimer to invite him to join the Manhattan Project at Los Alamos, but delays in the processing of his security clearance prevented him from contributing to the project. It has been rumoured that he visited the Calutron project, where he suggested that young women be employed to operate the calutrons producing enriched radioactive materials for the atomic weapons.
Philosophy of systematization
He wrote that his scientific research was motivated by his desire to participate in the progress of different subjects in science to the best of his ability, and that the prime motive underlying his work was systematization. "What a scientist tries to do essentially is to select a certain domain, a certain aspect, or a certain detail, and see if that takes its appropriate place in a general scheme which has form and coherence; and, if not, to seek further information which would help him to do that."
Chandrasekhar developed a unique style of mastering several fields of physics and astrophysics; consequently, his working life can be divided into distinct periods. He would exhaustively study a specific area, publish several papers in it and then write a book summarizing the major concepts in the field. He would then move on to another field for the next decade and repeat the pattern. Thus he studied stellar structure, including the theory of white dwarfs, during the years 1929 to 1939, and subsequently focused on stellar dynamics, theory of Brownian motion from 1939 to 1943. Next, he concentrated on the theory of radiative transfer and the quantum theory of the negative ion of hydrogen from 1943 to 1950. This was followed by sustained work on turbulence and hydrodynamic and hydromagnetic stability from 1950 to 1961. In the 1960s, he studied the equilibrium and the stability of ellipsoidal figures of equilibrium, and also general relativity. During the period, 1971 to 1983 he studied the mathematical theory of black holes, and, finally, during the late 80s, he worked on the theory of colliding gravitational waves.
Work with students
Chandra worked closely with his students and expressed pride in the fact that over a 50-year period (from roughly 1930 to 1980), the average age of his co-author collaborators had remained the same, at around 30. He insisted that students address him as "Chandrasekhar" until they received their Ph.D. degree, after which time they (as other colleagues) were encouraged to address him as "Chandra". When Chandrasekhar was working at the Yerkes Observatory in 1940s, he would drive 150 miles (240 km) to and fro every weekend to teach a course at the University of Chicago. Two of the students who took the course, Tsung-Dao Lee and Chen-Ning Yang, won the Nobel prize before he could get one for himself. Regarding classroom interactions during his lectures, noted astrophysicist Carl Sagan stated from firsthand experience that "frivolous questions" from unprepared students were "dealt with in the manner of a summary execution", while questions of merit "were given serious attention and response".
From 1952 to 1971 Chandrasekhar was editor of The Astrophysical Journal. When Eugene Parker submitted a paper on his discovery of solar wind in 1957, two of eminent reviewers rejected the paper. But since Chandra as an editor could not find any mathematical flaws in Parker's work, he went ahead and published the paper in 1958.
During the years 1990 to 1995, Chandrasekhar worked on a project devoted to explaining the detailed geometric arguments in Sir Isaac Newton's Philosophiae Naturalis Principia Mathematica using the language and methods of ordinary calculus. The effort resulted in the book Newton's Principia for the Common Reader, published in 1995. Chandrasekhar was an honorary member of the International Academy of Science.
Chandrasekhar died of a sudden heart attack at the University of Chicago Hospital in 1995, having survived a prior heart attack in 1975. He was survived by his wife, Lalitha Chandrasekhar, who died on 2 September 2013 at the age of 102. He was a serious student of literature and western classical music.
Once when involved in a discussion about the Gita, Chandrasekhar said, "I should like to preface my remarks with a personal statement in order that my later remarks will not be misunderstood. I consider myself an atheist." This was also confirmed many times in his other talks. In an interview with Kevin Krisciunas at the University of Chicago, on 6 October 1987, Chandrasekhar commented: "Of course, he (Otto Struve) knew I was an atheist, and he never brought up the subject with me".
Awards, honours and legacy
Chandrasekhar was awarded the Nobel Prize in Physics in 1983 for his studies on the physical processes important to the structure and evolution of stars. Chandrasekhar accepted this honor, but was upset the citation mentioned only his earliest work, seeing it as a denigration of a lifetime's achievement. He shared it with William A. Fowler.
- Elected a Fellow of the Royal Society (FRS) in 1944
- Henry Norris Russell Lectureship (1949)
- Bruce Medal (1952)
- Gold Medal of the Royal Astronomical Society (1953)
- Rumford Prize of the American Academy of Arts and Sciences (1957)
- National Medal of Science, USA (1966)
- Padma Vibhushan (1968)
- Henry Draper Medal of the National Academy of Sciences (1971)
- Copley Medal of the Royal Society (1984)
- Honorary Fellow of the International Academy of Science (1988)
- Gordon J. Laing Award (1989)
- Jansky Lectureship before the National Radio Astronomy Observatory
- Humboldt Prize
Chandrasekhar's most notable work was the astrophysical Chandrasekhar limit. The limit describes the maximum mass of a white dwarf star, ~1.44 solar masses, or equivalently, the minimum mass which must be exceeded for a star to ultimately collapse into a neutron star or black hole (following a supernova). The limit was first calculated by Chandrasekhar in 1930 during his maiden voyage from India to Cambridge, England for his graduate studies. In 1979, NASA named the third of its four "Great Observatories" after Chandrasekhar. This followed a naming contest which attracted 6,000 entries from fifty states and sixty-one countries. The Chandra X-ray Observatory was launched and deployed by Space Shuttle Columbia on 23 July 1999. The Chandrasekhar number, an important dimensionless number of magnetohydrodynamics, is named after him. The asteroid 1958 Chandra is also named after Chandrasekhar. The Himalayan Chandra Telescope is named after him. In the Biographical Memoirs of the Fellows of the Royal Society of London, R. J. Tayler wrote: "Chandrasekhar was a classical applied mathematician whose research was primarily applied in astronomy and whose like will probably never be seen again."
Chandrasekhar guided 45 students to their PhDs. After his death, his widow Lalitha Chandrasekhar made a gift of his Nobel Prize money to the University of Chicago towards the establishment of the Subrahmanyan Chandrasekhar Memorial Fellowship. First awarded in the year 2000, this fellowship is given annually to an outstanding applicant to graduate school in the PhD programs of the Department of Physics or the Department of Astronomy and Astrophysics.
The Chandra Astrophysics Institute (CAI) is a program offered for high school students who are interested in astrophysics mentored by MIT scientists and sponsored by the Chandra X-ray Observatory. American astronomer Carl Sagan, who studied mathematics under Chandrasekhar at the University of Chicago, praised him in the book The Demon-Haunted World: "I discovered what true mathematical elegance is from Subrahmanyan Chandrasekhar." On 19 October 2017, Google showed a Google Doodle in 28 countries honouring Chandrasekhar's 107th birthday and the Chandrasekhar limit.
In 2010, on account of Chandra's 100th birthday, University of Chicago conducted a symposium titled Chandrasekhar Centennial Symposium 2010 which was attended by leading astrophysicists such as Roger Penrose, Kip Thorne, Freeman Dyson, Jayant V. Narlikar, Rashid Sunyaev, G. Srinivasan, and Clifford Will. Its research talks were published in 2011 as a book titled Fluid flows to Black Holes: A tribute to S Chandrasekhar on his birth centenary.
- Chandrasekhar, S. (1958) . An Introduction to the Study of Stellar Structure. New York: Dover. ISBN 0-486-60413-6.
- Chandrasekhar, S. (2005) . Principles of Stellar Dynamics. New York: Dover. ISBN 0-486-44273-X.
- Chandrasekhar, S. (1960) . Radiative Transfer. New York: Dover. ISBN 0-486-60590-6.
- Chandrasekhar, S. (1975) . Plasma Physics. Chicago: The University of Chicago Press. ISBN 0-226-10084-7.
- Chandrasekhar, S. (1981) . Hydrodynamic and Hydromagnetic Stability. New York: Dover. ISBN 0-486-64071-X.
- Chandrasekhar, S. (1987) . Ellipsoidal Figures of Equilibrium. New York: Dover. ISBN 0-486-65258-0.
- Chandrasekhar, S. (1998) . The Mathematical Theory of Black Holes. New York: Oxford University Press. ISBN 0-19-850370-9.
- Chandrasekhar, S. (1983) . Eddington: The Most Distinguished Astrophysicist of His Time. Cambridge University Press. ISBN 9780521257466.
- Chandrasekhar, S. (1990) . Truth and Beauty. Aesthetics and Motivations in Science. Chicago: The University of Chicago Press. ISBN 0-226-10087-1.
- Chandrasekhar, S. (1995). Newton's Principia for the Common Reader. Oxford: Clarendon Press. ISBN 0-19-851744-0.
- Spiegel, E.A. (2011) . The Theory of Turbulence : Subrahmanyan Chandrasekhar's 1954 Lectures. Netherlands: Springer. ISBN 978-94-007-0117-5.
- Chandrasekhar, S. (1943). Stochastic Problems in Physics and Astronomy. Reviews of modern physics.
- Chandrasekhar, S. (1993). Classical general relativity. Royal Society.
- Chandrasekhar, S. (1979). The Role of General Relativity: Retrospect and Prospect. Proc. IAU Meeting.
- Chandrasekhar, S. (1943). New methods in stellar dynamics. New York Academy of Sciences.
- Chandrasekhar, S. (1954). The illumination and polarization of the sunlit sky on Rayleigh scattering. American Philosophical Society.
- Chandrasekhar, S. (1983). On Stars, their evolution and their stability, Noble lecture. Stockholm: Noble Foundation.
- Chandrasekhar, S. (1981). New horizons of human knowledge: a series of public talks given at Unesco. Unesco Press.
- Chandrasekhar, S. (1975). Shakespeare, Newton, and Beethoven: Or, Patterns of Creativity. University of Chicago.
- Chandrasekhar, S. (1973). P.A.M. Dirac on his seventieth birthday. Contemporary Physics.
- Chandrasekhar, S. (1947). Heywood, Robert B., ed. The Works of the Mind:The Scientist. Chicago: University of Chicago Press. pp. 159–179. OCLC 752682744.
- Chandrasekhar, S. (1995). Reminiscences and discoveries on Ramanujan's bust. Royal Society. ASIN B001B12NJ8.
- Chandrasekhar, S. (1990). How one may explore the physical content of the general theory of relativity. American Mathematical Society. ASIN B001B10QTM.
Chandrasekhar had published around 380 papers in his lifetime. He wrote his first paper in 1928 when he was still an undergraduate student about Compton effect and last paper which was accepted for publication just two months before his death was in 1995 which was about non-radial oscillation of star. The University of Chicago Press published selected papers of Chandrasekhar in seven volumes.
- Chandrasekhar, S. (1989). Selected Papers, Vol 1, Stellar structure and stellar atmospheres. Chicago: University of Chicago Press. ISBN 9780226100890.
- Chandrasekhar, S. (1989). Selected Papers, Vol 2, Radiative transfer and negative ion of hydrogen. Chicago: University of Chicago Press. ISBN 9780226100920.
- Chandrasekhar, S. (1989). Selected Papers, Vol 3, Stochastic, statistical and hydromagnetic problems in Physics and Astronomy. Chicago: University of Chicago Press. ISBN 9780226100944.
- Chandrasekhar, S. (1989). Selected Papers, Vol 4, Plasma Physics, Hydrodynamic and Hydromagnetic stability, and applications of the Tensor-Virial theorem. Chicago: University of Chicago Press. ISBN 9780226100975.
- Chandrasekhar, S. (1990). Selected Papers, Vol 5, Relativistic Astrophysics. Chicago: University of Chicago Press. ISBN 9780226100982.
- Chandrasekhar, S. (1991). Selected Papers, Vol 6, The Mathematical Theory of Black Holes and of Colliding Plane Waves. Chicago: University of Chicago Press. ISBN 9780226101019.
- Chandrasekhar, S. (1997). Selected Papers, Vol 7, The non-radial oscillations of star in General Relativity and other writings. Chicago: University of Chicago Press. ISBN 9780226101040.
Books about Chandrasekhar
- Miller, Arthur I. (2005). Empire of the Stars: Friendship, Obsession, and Betrayal in the Quest for Black Holes. Boston: Houghton Mifflin. ISBN 0-618-34151-X.
- Srinivasan, G., ed. (1997). From White Dwarfs to Black Holes: The Legacy of S. Chandrasekhar. Chicago: The University of Chicago Press. ISBN 0-226-76996-8.
- Penrose, R. (1996). Chandrasekhar, Black Holes and Singularities. J. Astrophys. Astr.
- Parker, E. (1996). S. Chandrasekhar and Magnetohydrodynamics. J. Astrophys. Astr.
- Wali, Kameshwar C. (1991). Chandra: A Biography of S. Chandrasekhar. Chicago: The University of Chicago Press. ISBN 0-226-87054-5.
- Wali, Kameshwar C., ed. (1997). Chandrasekhar: The Man Behind the Legend - Chandra Remembered. London: imperial College Press. ISBN 1-86094-038-2.
- Wignesan, T., ed. (2004). The Man who Dwarfed the Stars. The Asianists' Asia. ISSN 1298-0358.
- Venkataraman, G. (1992). Chandrasekhar and His Limit. Hyderabad, India: Universities Press. ISBN 81-7371-035-X.
- Saikia, D J.; et al., eds. (2011). Fluid flows to Black Holes: A tribute to S Chandrasekhar on his birth centenary. Singapore: World Scientific Publishing Co. Ptd Ltd. ISBN 981-4299-57-X.
- Kameshwar, C Wali, ed. (2001). A Quest For Perspectives. Singapore: World Scientific Publishing Co. Ptd Ltd. ISBN 1-86094-201-6.
- Ramnath, Radhika, ed. (2012). S. Chandrasekhar: Man of Science. Harpercollins. ASIN B00C3EWIME.
- Kameshwar, C Wali, ed. (2011). A Scientific Autobiography: S Chandrasekhar. Singapore: World Scientific Publishing Co. Ptd Ltd. ISBN 981-4299-57-X.
- Salwi, Dilip, ed. (2004). S. Chandrasekhar: The scholar scientist. Rupa. ISBN 8129104911.
- Pandey, Rakesh Kumar, ed. (2017). Chandrasekhar Limit: Size of White Dwarfs. Lap Lambert Academic Publishing. ISBN 3330317663.
- Tayler, R. J. (1996). "Subrahmanyan Chandrasekhar. 19 October 1910 – 21 August 1995". Biographical Memoirs of Fellows of the Royal Society. 42: 80–94. doi:10.1098/rsbm.1996.0006.
- "Subrahmanyan Chandrasekhar – The Mathematics Genealogy Project". www.genealogy.math.ndsu.nodak.edu.
- http://www.nasonline.org, National Academy of Sciences –. "Biographical Memoirs Home". books.nap.edu.
- C.), Wali, K. C. (Kameshwar (1991). Chandra : a biography of S. Chandrasekhar. Chicago: University of Chicago Press. p. 9. ISBN 0226870545. OCLC 21297960.
- Vishveshwara, C.V. (25 April 2000). "Leaves from an unwritten diary: S. Chandrasekhar, Reminiscences and Reflections" (PDF). Current Science. 78 (8): 1025–1033. Retrieved 2008-02-27.
- Horgan, J. (1994). "Profile: Subrahmanyan Chandrasekhar—Confronting the Final Limit". Scientific American. 270 (3): 32–33.
- O'Connor, J. J.; Robertson, E. F. "Subrahmanyan Chandrasekhar". Biographies. School of Mathematics and Statistics University of St Andrews, Scotland. Retrieved 21 May 2012.
- "Subrahmanyan Chandrasekhar". starchild.gsfc.nasa.gov. Retrieved 2017-10-19.
- S. Chandrasekhar : the man behind the legend. Wali, K. C. (Kameshwar C.). London: Imperial College Press. 1997. p. 107. ISBN 1860940382. OCLC 38847561.
- Chandrasekhar, S. 1983. Autobiography Nobel Foundation, Stockholm, Sweden.
- "S Chandrasekhar: Why Google honours him". www.aljazeera.com. Retrieved 2017-10-18.
- K.C. Wali, "Chandrasekhar vs. Eddington: An Unanticipated Confrontation", Physics Today, vol. 35, no. 10, pp. 33–40 (October, 1982)
- "S Chandrashekhar, India's great astrophysicist: Why Google Doodle is celebrating the Nobel prize winner". The Financial Express. 2017-10-19. Retrieved 2017-10-19.
- Chandrasekhar, S. (1943). On the conditions for the existence of three shock waves. Ballistic Research Laboratory, Aberdeen Proving Ground, Report, (367).
- Chandrasekhar, S. (1943). Optimum Height for the Bursting of a 105mm Shell (No. BRL-MR-139). Army Ballistic Research Lab Aberdeen Procing Ground MD. http://www.dtic.mil/dtic/tr/fulltext/u2/492801.pdf
- The Works of the Mind, p.176, edited by Robert B. Heywood, University of Chicago Press, 1947.
- Helmut A. Abt (1 December 1995). "Obituary – Chandrasekhar, Subrahmanyan". Astrophysical Journal. 454: 551. Bibcode:1995ApJ...454..551A. doi:10.1086/176507.
- Parker, E. N. (1958). Dynamics of the interplanetary gas and magnetic fields. The Astrophysical Journal, 128, 664.
- "Nobel laureate's wife Lalitha Chandrasekhar dies at 102". The Hindu. 2013-09-07. Retrieved 2014-01-02.
- S. Chandrasekhar: the man behind the legend, Kameshwar C. Wali. Imperial College Press (1 January 1997) ISBN 978-1860940385
- Kameshwar C. Wali (1991). Chandra: A Biography of Chandrasekhar. University of Chicago Press. p. 304. ISBN 9780226870557.
SC: I am not religious in any sense; in fact, I consider myself an atheist.
- "Interview with Dr. S. Chandrasekhar". American Institute of Physics.
- "Grants, Prizes and Awards". American Astronomical Society. Archived from the original on 24 January 2010. Retrieved 24 February 2011.
- "Past Winners of the Catherine Wolfe Bruce Gold Medal". Astronomical Society of the Pacific. Retrieved 24 February 2011.
- "Winners of the Gold Medal of the Royal Astronomical Society". Royal Astronomical Society. Archived from the original on 25 May 2011. Retrieved 24 February 2011.
- "Past Recipients of the Rumford Prize". American Academy of Arts and Sciences. Retrieved 24 February 2011.
- "The President's National Medal of Science: Recipient Details – NSF – National Science Foundation". www.nsf.gov.
- "Henry Draper Medal". National Academy of Sciences. Archived from the original on 26 January 2013. Retrieved 24 February 2011.
- Singh, Virendra (26 October 2011). "S Chandrasekhar: His Life and Science". Resonance. 16 (10): 960. doi:10.1007/s12045-011-0094-0.
- "Subrahmanyan Chandrasekhar Memorial Fellowship".
- Hartman, Mark; Ashton, Peter; Porro, Irene; Ahmed, Shakib; Kol, Simba. "Chandra Astrophysics Institute". MIT OpenCourseWare. Retrieved 2017-10-20.
- "The Chandra Astrophysics Institute – ChandraBlog – Fresh Chandra News". chandra.harvard.edu.
- "S. Chandrasekhar's 107th Birthday".
- Rajamanickam Antonimuthu (18 October 2017). "S. Chandrasekhar Google Doodle" – via YouTube.
- Chandrasekhar, S. (1973). PAM dirac on his seventieth birthday. Contemporary Physics, 14(4), 389–394.
- "Publications by S. Chandrasekhar" (PDF). Indian Academy of Sciences. Retrieved 15 May 2017.
- Tayler, R. J. (1996). Subrahmanyan Chandrasekhar. 19 October 1910–21 August 1995. Biographical Memoirs of Fellows of the Royal Society, 42, 81–94.
- "Thermodynamics of the Compton Effect with Reference to the Interior of the Stars" (PDF). Indian Journal of Physics. 3: 241–50.
- Chandrasekhar, Subrahmanyan, and Valeria Ferrari. "On the Non-Radial Oscillations of a Star: V. A Fully Relativistic Treatment of a Newtonian Star." Proceedings of the Royal Society of London A: Mathematical, Physical and Engineering Sciences. Vol. 450. No. 1939. The Royal Society, 1995. http://rspa.royalsocietypublishing.org/content/450/1939/463.short
- Great Indians: Professor Subrahmanyan Chandrasekhar – Video of Chandra's last interview at Chicago.
- Audio – Subrahmanyan Chandrasekhar(1988) The founding of general relativity and its excellence
- Audio – Cain/Gay (2010) Astronomy Cast Chandrasekhar
- National Academy of Sciences biography
- Harvard's site on Chandrasekhar
- Subrahmanyan Chandrasekhar
- Subrahmanyan Chandrasekhar
- Subramaniam Chandrashekhar
- Bruce Medal page
- Awarding of Bruce Medal: PASP 64 (1952) 55
- Oral History interview transcript with Subrahmanyan Chandrasekhar 17, 18 May 1977 & 31 October 1977, American Institute of Physics, Niels Bohr Library and Archives
- Oral History interview transcript with Subrahmanyan Chandrasekhar 6 October 1987, American Institute of Physics, Niels Bohr Library and Archives
- Mathematics Genealogy Project
- Concordia University Honorary Degree Citation, June 1988, Concordia University Records Management and Archives
- National Academy of Sciences Biographical Memoir