← Back to Training
MCQAdvancedCosmology & Universe2 parts
USAAAO — 2019 First Round
Questions 3–4
This question has 2 parts that build on each other. Answer both — it only counts as correct if every part is right.
Part AQuestion 3
A quasar with a bolometric flux of approximately 10⁻¹² erg s⁻¹ cm⁻² is observed at a redshift of 1.5, i.e. its comoving radial distance is about 4.4 Gpc. What is the bolometric luminosity of the quasar?
Part BQuestion 4
Now, let’s assume that the quasar in the previous question is observed to have a companion galaxy which is 5 arcseconds apart. What is the projected linear separation of the companion galaxy from the quasar?
Sign in to save your progress.
Answer both parts to check. Both must be correct to count as correct.