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CANDELS: The progenitors of compact quiescent galaxies at z~2 | | Guillermo Barro
; S. M. Faber
; Pablo G. Perez-Gonzalez
; David C. Koo
; Christina C. Williams
; Dale D. Kocevski
; Jonathan R. Trump
; Mark Mozena
; Elizabeth McGrath
; Arjen van der Wel
; Stijn Wuyts
; Eric F. Bell
; Darren J. Croton
; Avishai Dekel
; M. L. N. Ashby
; Henry C. Ferguson
; Adriano Fontana
; Mauro Giavalisco
; Norman A. Grogin
; Yicheng Guo
; Nimish P. Hathi
; Philip F. Hopkins
; Kuang-Han Huang
; Anton M. Koekemoer
; Jeyhan S. Kartaltepe
; Kyoung-Soo Lee
; Jeffrey A. Newman
; Lauren A. Porter
; Joel R. Primack
; Russell E. Ryan
; David Rosario
; Rachel S. Somerville
; | | Date: |
21 Jun 2012 | | Abstract: | We combine high-resolution HST/WFC3 images with multi-wavelength photometry
to track the evolution of structure and activity of massive (log(M*) > 10)
galaxies at redshifts z = 1.4 - 3 in two fields of the Cosmic Assembly
Near-infrared Deep Extragalactic Legacy Survey (CANDELS). We detect compact,
star-forming galaxies (cSFGs) whose number densities, masses, sizes, and star
formation rates qualify them as likely progenitors of compact, quiescent,
massive galaxies (cQGs) at z = 1.5 - 3. At z > 2 most cSFGs have specific
star-formation rates (sSFR = 10^-9 yr^-1) half that of typical, massive SFGs at
the same epoch, and host X-ray luminous AGN 30 times (~30%) more frequently.
These properties suggest that cSFGs are formed by gas-rich processes (mergers
or disk-instabilities) that induce a compact starburst and feed an AGN, which,
in turn, quench the star formation on dynamical timescales (few 10^8 yr). The
cSFGs are continuously being formed at z = 2 - 3 and fade to cQGs by z = 1.5.
After this epoch, cSFGs are rare, thereby truncating the formation of new cQGs.
Meanwhile, down to z = 1, existing cQGs continue to enlarge to match local QGs
in size, while less-gas-rich mergers and other secular mechanisms shepherd
(larger) SFGs as later arrivals to the red sequence. In summary, we propose two
evolutionary scenarios of QG formation: an early (z > 2), fast-formation path
of rapidly-quenched cSFGs that evolve into cQGs that later enlarge within the
quiescent phase, and a slow, late-arrival (z < 2) path for SFGs to form QGs
without passing through a compact state. | | Source: | arXiv, 1206.5000 | | Services: | Forum | Review | PDF | Favorites | |
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