Why are early objects so massive?

[DarkStar8]

If we had a universe which was full of copies of our Local Group throughout the entire universe I would have thought that given the tremendous distances in the universe that eventually objects far away would be too small to resolve. So why do we still see objects like Quasars that are far more massive more brighter and more powerful than anything we have in our neighbourhood.

[ACG52]

 

If we had a universe which was full of copies of our Local Group throughout the entire universe I would have thought that given the tremendous distances in the universe that eventually objects far away would be too small to resolve.

 

 

It used to be they were too far away to resolve.

 

We have better telescopes now.

[Arch2008]

Images from billions of light years away are of events that actually happened billions of years ago. Billions of years ago our local group of galaxies probably had Quasars, but not anymore. "Quasi-stellar" objects are most likely black holes accreting mass from surrounding dust particles all the way up to nearby stars. During early galaxy formation, a super massive black hole was able to "feed" on surrounding matter. However, at one point the accretion creates a shockwave that drives matter beyond a certain distance away, thus turning off the feeding. So we see this in distant young galaxies but not in the surrounding mature galaxies.