User Jim421616

14 votes

2 answers

1k views

Quasar mass and accretion rates

quasars accretion-discs

asked Jul 3, 2018 at 22:07

11 votes

1 answer

2k views

A "strange" unit radio astronomy

radio-astronomy units

asked Mar 4, 2019 at 22:16

10 votes

3 answers

1k views

What's the meaning of virial in Astronomy, and in particular the expression "a virialized cluster of galaxies"?

terminology celestial-mechanics thermodynamics

asked Sep 9, 2021 at 21:59

9 votes

1 answer

551 views

What does "Effective radius of [CII] line is 1.4 kpc" mean?

spectroscopy quasars

asked Jun 16 at 4:46

7 votes

1 answer

132 views

Why is the Milky Way's SMBH inactive?

galaxy milky-way supermassive-black-hole active-galaxy

asked Jun 23, 2021 at 22:20

6 votes

1 answer

88 views

Why are the radio images of the jet of 3C 273 different?

quasars image-processing

asked Aug 1, 2021 at 20:37

6 votes

1 answer

110 views

3C273 jet mass estimate

quasars resource-request astronomical-jet estimate synchrotron-radiation

asked Jul 5, 2018 at 2:20

4 votes

1 answer

157 views

Tuning radio telescopes

radio-astronomy redshift radio-telescope hydrogen

asked Mar 11, 2019 at 22:46

3 votes

1 answer

70 views

An image for the unified model of AGN

active-galaxy resource-request

asked Mar 5, 2019 at 9:20

3 votes

0 answers

120 views

Number of obscured AGN compared to unobscured AGN

galaxy quasars active-galaxy

asked Jun 30, 2019 at 23:20

3 votes

0 answers

34 views

How does SDSS estimate photometric redshift of sources?

telescope spectroscopy redshift photometry sky-survey

asked Jun 7 at 21:51

2 votes

0 answers

116 views

Cross-matching astronomical catalogs

observational-astronomy star-catalogues

asked Jan 19, 2021 at 23:12

2 votes

1 answer

28 views

Where can I find data on SDSS filter profiles?

telescope photometry

asked May 19 at 23:15

2 votes

1 answer

45 views

Radio SEDs for quasars

radio-astronomy spectroscopy quasars

asked Jul 16, 2021 at 22:28

2 votes

1 answer

56 views

Photometry templates -- what are the templates of?

distances redshift photometry

asked Jul 20, 2021 at 20:31

2 votes

0 answers

22 views

Why are the sky distributions of SDSS DR16 and DR16Q different?

coordinate sky-survey

asked Jun 20 at 20:42

2 votes

1 answer

59 views

Meaning of "blue continuum spectrum"?

spectra active-galaxy

asked Sep 23, 2021 at 20:57

2 votes

0 answers

110 views

Luminosity of the Milky Way compared to Seyfert galaxies

galaxy milky-way luminosity seyfert-galaxy

asked Apr 8, 2019 at 22:58

2 votes

2 answers

199 views

Wavelengths for observed objects -- emitted or observed?

redshift wavelength

asked Aug 7, 2018 at 3:40

2 votes

2 answers

1k views

Practicing image processing and analysis

data-analysis photography

asked Aug 10, 2017 at 21:57

2 votes

1 answer

117 views

Units of integrated flux density (irradiance) along longitudes

fundamental-astronomy units

asked Oct 30, 2017 at 1:31

2 votes

0 answers

71 views

Correction to inverse square law for cosmology

cosmology spectroscopy quasars

asked Feb 1, 2019 at 2:04

1 vote

2 answers

380 views

Problems with FITS headers

data-analysis python fits-header

asked Sep 24, 2017 at 21:15

1 vote

2 answers

79 views

Can I take logarithms of magnitudes (which are already log) [closed]

redshift quasars magnitude

asked Aug 15, 2018 at 0:31

1 vote

3 answers

171 views

Ratios of magnitudes instead of differences

star observational-astronomy magnitude

asked Aug 16, 2018 at 22:55

1 vote

0 answers

83 views

Regression line in a colour-colour diagram

photometry magnitude

asked Sep 24, 2018 at 23:31

1 vote

0 answers

50 views

Causes of emission of accretion disk

black-hole quasars accretion-discs

asked Jun 12, 2019 at 3:03

1 vote

1 answer

282 views

Exposure time for spectroscopy compared to photometry

observational-astronomy spectroscopy photometry

asked Jun 12, 2019 at 3:26

1 vote

1 answer

99 views

Relationship between photometric colour and redshift

redshift photometry

asked Mar 27, 2019 at 22:17

1 vote

0 answers

40 views

Relationship between photometric colour and redshift, part two

redshift photometry

asked Mar 28, 2019 at 0:04

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41 Questions

Quasar mass and accretion rates

A "strange" unit radio astronomy

What's the meaning of virial in Astronomy, and in particular the expression "a virialized cluster of galaxies"?

What does "Effective radius of [CII] line is 1.4 kpc" mean?

Why is the Milky Way's SMBH inactive?

Why are the radio images of the jet of 3C 273 different?

3C273 jet mass estimate

Tuning radio telescopes

An image for the unified model of AGN

Number of obscured AGN compared to unobscured AGN

How does SDSS estimate photometric redshift of sources?

Cross-matching astronomical catalogs

Where can I find data on SDSS filter profiles?

Radio SEDs for quasars

Photometry templates -- what are the templates of?

Why are the sky distributions of SDSS DR16 and DR16Q different?

Meaning of "blue continuum spectrum"?

Luminosity of the Milky Way compared to Seyfert galaxies

Wavelengths for observed objects -- emitted or observed?

Practicing image processing and analysis

Units of integrated flux density (irradiance) along longitudes

Correction to inverse square law for cosmology

Problems with FITS headers

Can I take logarithms of magnitudes (which are already log) [closed]

Ratios of magnitudes instead of differences

Regression line in a colour-colour diagram

Causes of emission of accretion disk

Exposure time for spectroscopy compared to photometry

Relationship between photometric colour and redshift

Relationship between photometric colour and redshift, part two