The Gentle Growth of Galaxies at High Redshifts in Overdense Environments
Abstract
We have explored prevailing modes of galaxy growth for redshifts z similar to 6-14, comparing substantially overdense and normal regions of the universe, using high-resolution zoom-in cosmological simulations. Such rare overdense regions have been projected to host high-z quasars. We demonstrate that galaxies in such environments grow predominantly by a smooth accretion from cosmological filaments which dominates the mass input from major, intermediate, and minor mergers. We find that by z similar to 6, the accumulated galaxy mass fraction from mergers falls short by a factor of 10 of the cumulative accretion mass for galaxies in the overdense regions, and by a factor of 5 in the normal environments. Moreover, the rate of the stellar mass input from mergers also lies below that of an in situ star Formation (SF) rate. The fraction of stellar masses in galaxies contributed by mergers in overdense regions is similar to 12%, and similar to 33% in the normal regions, at these redshifts. Our median SF rates for similar to few x 10(9) M-circle dot galaxies agrees well with the recently estimated rates for z similar to 7 galaxies from Spitzer's SURF-UP survey. Finally, we find that the main difference between the normal and overdense regions lies in the amplified growth of massive galaxies in massive dark matter halos. This leads to the Formation of similar to 10(10) M-circle dot galaxies due to the similar to 100 fold increase in mass during the above time period. Such galaxies are basically absent in the normal regions at these redshifts.
Department
Subject
galaxies: evolution
galaxies: Formation
galaxies: halos
galaxies:
high-redshift
galaxies: interactions
galaxies: star Formation
particle hydrodynamics simulations
star-forming galaxies
stellar
populations
luminosity function
dark-matter
reionization
quasars
qso
i.
z-greater-than-6
astronomy & astrophysics
galaxies: Formation
galaxies: halos
galaxies:
high-redshift
galaxies: interactions
galaxies: star Formation
particle hydrodynamics simulations
star-forming galaxies
stellar
populations
luminosity function
dark-matter
reionization
quasars
qso
i.
z-greater-than-6
astronomy & astrophysics
xmlui.dri2xhtml.METS-1.0.item-citation
Romano-Diaz, Emilio, Isaac Shlosman, Jun-Hwan Choi, and Raphael Sadoun. "The Gentle Growth of Galaxies at High Redshifts in Overdense Environments." The Astrophysical Journal Letters, Vol. 790, No. 2 (Aug., 2014): L32.Collections
Related items
Showing items related by title, author, creator and subject.
-
CANDELS Observations Of The Structural Properties Of Cluster Galaxies At Z=1.62
Papovich, Casey; Bassett, Robert; Lotz, Jennifer M.; van der Wel, A.; Tran, K. V.; Finkelstein, Steven L.; Bell, Eric F.; Conselice, Christopher J.; Dekel, Avishai; Dunlop, J. S.; Guo, Y. C.; Faber, S. M.; Farrah, D.; Ferguson, Henry C.; Finkelstein, Keely D.; Haussler, Boris; Kocevski, D. D.; Koekemoer, A. M.; Koo, D. C.; McGrath, E. J.; McLure, R. J.; McIntosh, Daniel H.; Momcheva, I.; Newman, Jeffrey A.; Rudnick, Gregory; Weiner, B.; Willmer, Christopher N. A.; Wuyts, S. (2012-05)We discuss the structural and morphological properties of galaxies in a z = 1.62 proto-cluster using near-IR imaging data from Hubble Space Telescope Wide Field Camera 3 data of the Cosmic Assembly Near-IR Deep Extragalactic ... -
The Hubble Space Telescope Advanced Camera for Surveys Coma Cluster Survey. I. Survey Objectives and Design
Carter, David; Goudfrooij, Paul; Mobasher, Bahram; Ferguson, Henry C.; Puzia, Thomas H.; Aguerri, Alfonso L.; Balcells, Marc; Batcheldor, Dan; Bridges, Terry J.; Davies, Jonathan I.; Erwin, Peter; Graham, Alister W.; Guzman, Rafael; Hammer, Derek; Hornschemeier, Ann; Hoyos, Carlos; Hudson, Michael J.; Huxor, Avon; Jogee, Shardha; Komiyama, Yutaka; Lotz, Jennifer; Lucey, John R.; Marzke, Ronald O.; Merritt, David; Miller, Bryan W.; Miller, Neal A.; Mouhcine, Mustapha; Okamura, Sadanori; Peletier, Reynier F.; Phillipps, Steven; Poggianti, Bianca M.; Sharples, Ray M.; Smith, Russell J.; Trentham, Neil; Tully, R. Brent; Valentijn, Edwin; Kleijn, Gijs Verdoes (2008-06)We describe the HST ACS Coma Cluster Treasury survey, a deep two-passband imaging survey of one of the nearest rich clusters of galaxies, the Coma Cluster (Abell 1656). The survey was designed to cover an area of 740 ... -
Are Dusty Galaxies Blue? Insights On Uv Attenuation From Dust-Selected Galaxies
Casey, C. M.; Scoville, N. Z.; Sanders, D. B.; Lee, N.; Cooray, Asantha; Finkelstein, Steven L.; Capak, P.; Conley, A.; De Zotti, G.; Farrah, D.; Fu, H.; Le Floc'h, E.; Ilbert, O.; Ivison, Rob J.; Takeuchi, T. T. (2014-12)Galaxies' rest-frame ultraviolet (UV) properties are often used to directly infer the degree to which dust obscuration affects the measurement of star formation rates (SFRs). While much recent work has focused on calibrating ...