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Bulge Growth and Quenching Since Z=2.5 in Candels/3D-HSTExploiting the deep high-resolution imaging of all 5 CANDELS fields, and accurate redshift informationprovided by 3D-HST, we investigate the relation between structure and stellar populations fora mass-selected sample of 6764 galaxies above 1010 M, spanning the redshift range 0.5 z 2.5.For the first time, we fit 2-dimensional models comprising a single Sersic fit and two-component (i.e.,bulge + disk) decompositions not only to the H-band light distributions, but also to the stellar massmaps reconstructed from resolved stellar population modeling. We confirm that the increased bulgeprominence among quiescent galaxies, as reported previously based on rest-optical observations, remainsin place when considering the distributions of stellar mass. Moreover, we observe an increaseof the typical Sersic index and bulge-to-total ratio (with median BT reaching 40-50) among starforminggalaxies above 1011 M. Given that quenching for these most massive systems is likely tobe imminent, our findings suggest that significant bulge growth precedes a departure from the starformingmain sequence. We demonstrate that the bulge mass (and ideally knowledge of the bulge andtotal mass) is a more reliable predictor of the star-forming versus quiescent state of a galaxy thanthe total stellar mass. The same trends are predicted by the state-of-the-art semi-analytic model bySomerville et al. In the latter, bulges and black holes grow hand in hand through merging andordisk instabilities, and AGN-feedback shuts off star formation. Further observations will be requiredto pin down star formation quenching mechanisms, but our results imply they must be internal to thegalaxies and closely associated with bulge growth.
Document ID
20140016557
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1088/0004-637X/788/1/11
Authors
Lang, Phillip (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Wuyts, Stijn (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Somerville, Rachel S. (State Univ. of New Jersey Piscataway, NJ, United States)
Schreiber, Natascha M. Foerster (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Genzel, Reinhard (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Bell, Eric F. (Michigan Univ. Hospitals Ann Arbor, MI, United States)
Brammer, Gabe (European Southern Observatory Santiago, Chile)
Dekel, Avishai (Hebrew Univ. Jerusalem, Israel)
Faber, Sandra M. (Lick Observatory Santa Cruz, CA, United States)
Ferguson, Henry C. (Space Telescope Science Inst. Baltimore, MD, United States)
Grogin, Norman A. (Space Telescope Science Inst. Baltimore, MD, United States)
Kocevski, Dale D. (Kentucky Univ. Lexington, KY, United States)
Koekemoer, Anton M. (Space Telescope Science Inst. Baltimore, MD, United States)
Lutz, Dieter (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
McGrath, Elizabeth J. (Colby Coll. Waterville, ME, United States)
Momcheva, Ivelina (Lick Observatory Santa Cruz, CA, United States)
Nelson, Erica J. (Yale Univ. New Haven, CT, United States)
Primack, Joel R. (California Univ. Santa Cruz, CA, United States)
Rosario, David J. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Skelton, Rosalind E. (South Africian Astronomical Observatory Cape Town, South Africa)
Tacconi, Linda J. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
van Dokkum, Peter G. (Yale Univ. New Haven, CT, United States)
Whitaker, Katherine E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
November 21, 2014
Publication Date
May 16, 2014
Publication Information
Publication: The Astrophysical Journal
Publisher: The Astrophysical Journal
Volume: 788
Issue: 1
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN14869
Funding Number(s)
CONTRACT_GRANT: NNH06CC03B
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Quenching
Bulge
Growth

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