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Jim421616
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14 votes
2 answers
1k views

Quasar mass and accretion rates

11 votes
1 answer
2k views

A "strange" unit radio astronomy

10 votes
3 answers
1k views

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

9 votes
1 answer
551 views

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

7 votes
1 answer
132 views

Why is the Milky Way's SMBH inactive?

6 votes
1 answer
88 views

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

6 votes
1 answer
110 views

3C273 jet mass estimate

4 votes
1 answer
157 views

Tuning radio telescopes

3 votes
1 answer
70 views

An image for the unified model of AGN

3 votes
0 answers
120 views

Number of obscured AGN compared to unobscured AGN

3 votes
0 answers
34 views

How does SDSS estimate photometric redshift of sources?

2 votes
0 answers
116 views

Cross-matching astronomical catalogs

2 votes
1 answer
28 views

Where can I find data on SDSS filter profiles?

2 votes
1 answer
45 views

Radio SEDs for quasars

2 votes
1 answer
56 views

Photometry templates -- what are the templates of?

2 votes
0 answers
22 views

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

2 votes
1 answer
59 views

Meaning of "blue continuum spectrum"?

2 votes
0 answers
110 views

Luminosity of the Milky Way compared to Seyfert galaxies

2 votes
2 answers
199 views

Wavelengths for observed objects -- emitted or observed?

2 votes
2 answers
1k views

Practicing image processing and analysis

2 votes
1 answer
117 views

Units of integrated flux density (irradiance) along longitudes

2 votes
0 answers
71 views

Correction to inverse square law for cosmology

1 vote
2 answers
380 views

Problems with FITS headers

1 vote
2 answers
79 views

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

1 vote
3 answers
171 views

Ratios of magnitudes instead of differences

1 vote
0 answers
83 views

Regression line in a colour-colour diagram

1 vote
0 answers
50 views

Causes of emission of accretion disk

1 vote
1 answer
282 views

Exposure time for spectroscopy compared to photometry

1 vote
1 answer
99 views

Relationship between photometric colour and redshift

1 vote
0 answers
40 views

Relationship between photometric colour and redshift, part two