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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Bulge growth and quenching since z = 2.5 in candels/3D-HST
Astrophysical Journal, Volume 788, No. 1, Article 11, Year 2014
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Description
Exploiting the deep high-resolution imaging of all five CANDELS fields, and accurate redshift information provided by 3D-HST, we investigate the relation between structure and stellar populations for a mass-selected sample of 6764 galaxies above 1010 M , spanning the redshift range 0.5 < z < 2.5. For the first time, we fit two-dimensional models comprising a single Sérsic fit and two-component (i.e., bulge + disk) decompositions not only to the H-band light distributions, but also to the stellar mass maps reconstructed from resolved stellar population modeling. We confirm that the increased bulge prominence among quiescent galaxies, as reported previously based on rest-optical observations, remains in place when considering the distributions of stellar mass. Moreover, we observe an increase of the typical Sérsic index and bulge-to-total ratio (with median B/T reaching 40%-50%) among star-forming galaxies above 1011 M . Given that quenching for these most massive systems is likely to be imminent, our findings suggest that significant bulge growth precedes a departure from the star-forming main sequence. We demonstrate that the bulge mass (and ideally knowledge of the bulge and total mass) is a more reliable predictor of the star-forming versus quiescent state of a galaxy than the total stellar mass. The same trends are predicted by the state-of-the-art, semi-analytic model by Somerville et al. In this model, bulges and black holes grow hand in hand through merging and/or disk instabilities, and feedback from active galactic nuclei shuts off star formation. Further observations will be required to pin down star formation quenching mechanisms, but our results imply that they must be internal to the galaxies and closely associated with bulge growth. © 2014. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Lang, Philipp
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Wuyts, Stijn
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Somerville, Rachel S.
United States, New Brunswick
Rutgers University–new Brunswick
Förster-Schreiber, Natascha M.F.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Genzel, Reinhardt
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Bell, Eric F.
United States, Ann Arbor
University of Michigan, Ann Arbor
Brammer, Gabriel B.
Chile, Santiago
European Southern Observatory Santiago
Dekel, Avishai
Israel, Jerusalem
Hebrew University of Jerusalem
Faber, Sandra M.
United States, Mount Hamilton
Lick Observatory
Ferguson, Henry C.
United States, Baltimore
Space Telescope Science Institute
Grogin, Norman A.
United States, Baltimore
Space Telescope Science Institute
Kocevski, Dale D.
United States, Lexington
University of Kentucky
Koekemoer, Anton M.
United States, Baltimore
Space Telescope Science Institute
Lutz, Dieter
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
McGrath, Elizabeth J.
United States, Waterville
Colby College
Momcheva, Ivelina G.
United States, Mount Hamilton
Lick Observatory
Nelson, Erica June
United States, New Haven
Yale University
Primack, Joel R.
United States, Santa Cruz
University of California, Santa Cruz
Rosario, David J.V.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Skelton, Rosalind E.
South Africa, Cape Town
South African Astronomical Observatory
Tacconi, Linda J.
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Van Dokkum, Pieter G.
United States, New Haven
Yale University
Whitaker, Katherine E.
United States, Greenbelt
Nasa Goddard Space Flight Center
Statistics
Citations: 193
Authors: 23
Affiliations: 13
Identifiers
Doi:
10.1088/0004-637X/788/1/11
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study