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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
GOODS-Herschel and candels: The morphologies of ultraluminous infrared galaxies at z ∼ 2
Astrophysical Journal, Volume 757, No. 1, Article 23, Year 2012
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Description
Using deep 100 and 160 μm observations in GOODS-South from GOODS-Herschel, combined with high-resolution HST/WFC3 near-infrared imaging from CANDELS, we present the first detailed morphological analysis of a complete, far-infrared (FIR) selected sample of 52 ultraluminous infrared galaxies (ULIRGs; LIR > 1012 L⊙) at z ∼ 2. We also make use of a comparison sample of galaxies with lower IR luminosities but with the same redshift and H-band magnitude distribution. Our visual classifications of these two samples indicate that the fractions of objects with disk and spheroid morphologies are roughly the same but that there are significantly more mergers, interactions, and irregular galaxies among the ULIRGs (72+5-7% versus 32 ± 3%). The combination of disk and irregular/interacting morphologies suggests that early-stage interactions, minor mergers, and disk instabilities could play an important role in ULIRGs at z ∼ 2. We compare these fractions with those of a z ∼ 1 sample selected from GOODS-H and COSMOS across a wide luminosity range and find that the fraction of disks decreases systematically with LIR while the fraction of mergers and interactions increases, as has been observed locally. At comparable luminosities, the fraction of ULIRGs with various morphological classifications is similar at z ∼ 2 and z ∼ 1, though there are slightly fewer mergers and slightly more disks at higher redshift. We investigate the position of the z ∼ 2 ULIRGs, along with 70 z ∼ 2 LIRGs, on the specific star formation rate versus redshift plane, and find 52 systems to be starbursts (i.e., they lie more than a factor of three above the main-sequence relation). We find that many of these systems are clear interactions and mergers (∼50%) compared to only 24% of systems on the main sequence relation. If irregular disks are included as potential minor mergers, then we find that up to ∼73% of starbursts are involved in a merger or interaction at some level. Although the final coalescence of a major merger may not be required for the high luminosities of ULIRGs at z ∼ 2 as is the case locally, the large fraction (50%-73%) of interactions at all stages and potential minor mergers suggests that these processes contribute significantly to the high star formation rates of ULIRGs at z ∼ 2. © 2012. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Kartaltepe, Jeyhan S.
United States, Tucson
National Optical Astronomy Observatory
Dickinson, Mark E.
United States, Tucson
National Optical Astronomy Observatory
Alexander, David M.
United Kingdom, Durham
Durham University
Bell, Eric F.
United States, Ann Arbor
University of Michigan, Ann Arbor
Dahlén, Tomas
United States, Baltimore
Space Telescope Science Institute
Elbaz, David
Chile, Santiago
Atacama Large Millimeter-submillimeter Array
Faber, Sandra M.
France, Gif-sur-yvette
Cea Saclay
Lotz, Jennifer M.
United States, Baltimore
Space Telescope Science Institute
McIntosh, Daniel H.
United States, Santa Cruz
University of California, Santa Cruz
United States, Kansas City
University of Missouri-kansas City
Wiklind, Thomas G.
Chile, Santiago
Atacama Large Millimeter-submillimeter Array
Altieri, Bruno
Spain, Madrid
European Space Astronomy Centre
Aussel, Hervé
France, Gif-sur-yvette
Cea Saclay
Béthermin, Matthieu M.
France, Gif-sur-yvette
Cea Saclay
Bournaud, Frédéric
France, Gif-sur-yvette
Cea Saclay
Charmandaris, V.
Greece, Rethymnon
University of Crete
Greece, Heraklion
Institute of Electronic Structure and Laser of the Foundation for Research and Technology-hellas
France, Paris
L'observatoire de Paris
Conselice, Christopher J.
United Kingdom, Nottingham
University of Nottingham
Cooray, Asantha Roshan
United States, Irvine
University of California, Irvine
Dannerbauer, Helmut
France, Gif-sur-yvette
Cea Saclay
Austria, Vienna
Universität Wien
Dav́e, Romeel
United States, Tucson
The University of Arizona
James S. Dunlop, James S.
United Kingdom, Edinburgh
The University of Edinburgh
Dekel, Avishai
Israel, Jerusalem
Hebrew University of Jerusalem
Ferguson, Henry C.
United States, Baltimore
Space Telescope Science Institute
Grogin, Norman A.
United States, Baltimore
Space Telescope Science Institute
Hwang, Ho-seong
France, Gif-sur-yvette
Cea Saclay
Ivison, Robert J.
United Kingdom, Edinburgh
Uk Astronomy Technology Centre
Kocevski, Dale D.
United States, Santa Cruz
University of California, Santa Cruz
Koekemoer, Anton M.
United States, Baltimore
Space Telescope Science Institute
Koo, David C.
United States, Santa Cruz
University of California, Santa Cruz
Lai, Kamson
United States, Santa Cruz
University of California, Santa Cruz
Leiton, Roger
France, Gif-sur-yvette
Cea Saclay
Lucas, Ray A.
Israel, Jerusalem
Hebrew University of Jerusalem
Lutz, Dieter
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Magdis, Georgios E.
United Kingdom, Oxford
University of Oxford
Magnelli, Benjamin
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Morrison, Glenn E.
United States, Honolulu
University of Hawaiʻi at Mānoa
United States, Kamuela
Télescope Canada-france-hawaii
Mozena, Mark
United States, Santa Cruz
University of California, Santa Cruz
Mullaney, James R.
France, Gif-sur-yvette
Cea Saclay
Newman, Jeffrey Allen
United States, Pittsburgh
University of Pittsburgh
Pope, Alexandra
United States, Amherst
University of Massachusetts Amherst
Popesso, Paola
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
van der Wel, Arjen
Germany, Heidelberg
Max Planck Institute for Astronomy
Weiner, Benjamin J.
United States, Tucson
The University of Arizona
Wuyts, Stijn
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Statistics
Citations: 151
Authors: 43
Affiliations: 26
Identifiers
Doi:
10.1088/0004-637X/757/1/23
ISSN:
0004637X