The Formation And Evolution Of Massive Galaxies And Their Supermassive Black Holes Over The Past 12 Billion Years
Bluck, Asa F.L.
Conselice, Christopher J.
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We present results from the recently completed GOODS NICMOS Survey,which utilizes 180 orbits of the HST with NIC-3 H-band imaging of$\gt$8000 galaxies in the GOODS fields. Moreover, we construct a uniquesample of 80 extremely massive galaxies (with log(M*) $\gt$ 11) at highredshifts (z = 1.7 - 3) and examine their merger properties throughmorphological and close pair methods. This represents the largest andmost thorough merger history examination to date for massive galaxies athigh redshifts. We conclude that these galaxies will experience onaverage 4 - 5 mergers with companion galaxies greater than log(M*) = 9,leading to a stellar mass increase of a factor of two from z = 3 to thepresent. We present arguments that this merging can explain most of theobserved size evolution of up to a factor of five in effective radiiover the same epoch of cosmic history. We also examine the AGNsub-sample of these galaxies, concluding that at least one third of allmassive galaxies will go through a Seyfert luminosity (or brighter) AGNphase leading to an average massive galaxy releasing through its AGN atleast 35 times its binding energy in radiation throughout its lifetime.We observe no strong evolution in the local black hole mass - galaxystellar mass relation, suggesting that supermassive black holes andtheir hosts grow principally together over the history of the Universe.We also note that it is massive galaxy Seyferts which dominate the X-rayluminosity function at all redshifts, up to z = 3. The profoundimplications of these processes will be discussed in relation to massivegalaxy formation and evolution. This work was funded by the STFC, theLeverhulme Trust, and NASA/STSci grant HST-GO11082. Show more
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Book title219th AAS Meeting, Austin, TX, January 2012. AAS Winter Meeting Abstracts
Pages / Article No.
PublisherAmerican Astronomical Society
Organisational unit03612 - Carollo, Marcella / Carollo, Marcella
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