Which of the following best describes the 'quenching' phenomenon in galaxy evolution?
Question 2
What is the primary method by which astronomers determine the star formation rate (SFR) of a distant galaxy?
Question 3
Consider a galaxy merger where a smaller galaxy with a stellar mass of $10^{10} M_{\odot}$ merges with a larger galaxy of stellar mass $5 \times 10^{10} M_{\odot}$. If the merger efficiency is 90\% (meaning 10\% of the mass is lost to the intergalactic medium), what is the approximate stellar mass of the resulting merged galaxy?
Question 4
Which of the following is a direct consequence of 'AGN feedback' on the interstellar medium of a galaxy?
Question 5
When observing galaxies at different cosmic times, what does the 'main sequence of star-forming galaxies' primarily represent?
