Tag: spectra

18 Why are wavelengths shorter than visible light neglected by new telescopes? 2016-11-09T19:50:03.077

11 What is the Lyman Alpha forest Used For? 2013-10-16T01:00:02.003

11 How to detect emission lines in optical spectra? 2013-10-21T17:23:16.240

8 Typical wavelength of solar flare 2014-12-07T07:39:18.473

7 Why does higher surface gravity broaden spectral lines? 2017-05-02T20:58:20.747

6 Why are O III lines so prominent in the spectra of emission nebulae when the amount of oxygen relative to hydrogen is a million times smaller? 2017-01-07T06:51:54.207

5 How do you estimate the error on the height/width of a Gaussian? 2015-12-01T21:39:47.383

5 Which measurements have shown that 2014 MU69 is red? (New Horizons' next target) 2016-10-20T07:32:42.447

5 Temperature gradient in stars 2018-09-02T14:18:07.173

4 What is an "arc" spectrum ? 2015-12-01T11:13:55.127

4 In galaxy optical spectra, why are Hbeta and Hdelta sometimes absorption lines? 2018-01-15T09:35:54.380

4 Do narrow lines in the spectra of O- and B- type stars always indicate magnetic fields? 2018-06-04T14:30:11.277

3 How to measure distances to stars by means of spectroscopic parallaxes? 2014-01-26T11:15:21.970

3 Spectral analysis of AGN (velocity dispersion of galaxy absorption, doppler shifts) 2015-04-13T15:51:13.947

3 Why isn't everything yellow(ish)? 2016-01-06T11:45:04.163

3 How deep is the "A" Fraunhofer line in the solar spectrum? Is it from the Sun's or Earth's atmosphere? 2016-08-24T11:06:31.557

3 wavelength-based IFU data cubes VS velocity-based IFU data cubes 2016-12-21T01:07:01.980

3 Why the forbidden lines of [OIII],[NII] and [SII],[OII] are sensitive to electron temperature and electron density, respectively? 2018-11-06T05:32:01.397

2 Broadband spectrum of Sun 2014-05-18T04:05:52.370

2 Invisible in visible light but visible in non-visible light? 2014-07-01T19:35:17.980

2 In Chromoscope, what is the X-ray source between Ophiuchus, Libra and Scorpius? 2014-12-02T00:16:47.260

2 How to tell whether an optical spectrum is featureless or just with a low S/N? 2015-04-02T03:30:07.063

2 about H$_\alpha$ and H$_\beta$ lines in astronomical objects' spectra 2015-07-07T01:26:42.480

2 Definition question: continuum-subtracted spectrum 2015-10-05T09:31:22.373

2 How to disentangle a very distant star's relative velocity vs. redshift distance 2015-10-29T01:44:08.577

2 In what manner is the spectrum of a black body really a continuum? 2016-02-23T15:21:27.660

2 How long do hot X-ray sources last? 2016-06-05T14:17:29.027

2 How to calculate the S/N of IFU or long-slit galaxy observations 2016-11-03T08:36:49.327

2 How do I understand a brown dwarf with a M-type spectrum? 2016-11-10T13:28:04.193

2 Source for Identification of Balmer Hydrogen Absorption Lines 2017-11-12T16:35:12.300

2 Who first used two lambdas to typeset the wavelengths of a spectra line doublet? 2018-01-16T08:15:13.230

2 absorption line from the chromosphere 2018-04-09T17:32:42.603

2 Why don't we see purple stars 2018-11-21T14:57:02.550

1 What is this graph showing? 2014-07-22T22:42:04.700

1 Why do we observe spectral lines of specific energy? 2015-07-19T13:16:59.800

1 Are hot stars like O-type stars entirely composed of helium? 2015-11-05T04:26:45.733

1 How do we know which elements are in a galaxy spectra? 2015-11-17T23:13:41.210

1 Why does spectral class and U-V colour correlate slightly differently for main sequence, giant and supergiant stars? 2015-11-19T16:05:53.033

1 Converting ångström spectral dimension to galaxy speed (km/s) 2016-07-05T01:16:35.960

1 What (actually) does "peculiar periodic spectral modulations" refer to in this preprint? 2016-10-25T14:57:15.807

1 What's the differences between one-dimensional spectrum and two-dimensional spectrum? 2016-12-05T05:27:47.850

1 How do elements with only one shell emit light? 2017-03-05T15:32:03.603

1 How did we differentiate lights from stars? 2017-03-05T20:44:21.493

0 Reference for broader spectral lines? 2016-02-15T03:48:32.753

0 Extraction of error spectrum in Sloan Digital Sky Survey 2016-07-16T18:10:10.293

0 How to convert theoretical template spectrum from luminosity density to flux density units? 2017-02-20T02:07:44.770

0 compute magnitude in vega system from fluxes in the unit of photons per unit area 2017-04-29T15:42:53.213

0 How to shift AGN x-ray spectrum to rest frame from 2017-07-06T01:03:37.450

-1 Where can I find a database of elemental spectra? 2018-03-03T17:05:11.760