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Cosmic Evolution of Star Formation Enhancement in Close Major-merger Galaxy Pairs Since z = 1

Xu, C. K. and Shupe, D. L. and Béthermin, M. and Aussel, H. and Berta, S. and Bock, J. and Bridge, C. and Conley, A. and Cooray, A. and Elbaz, D. and Franceschini, A. and Le Floc'h, E. and Lu, N. and Lutz, D. and Magnelli, B. and Marsden, G. and Oliver, S. J. and Pozzi, F. and Riguccini, L. and Schulz, B. and Scoville, N. and Vaccari, M. and Vieira, J. D. and Wang, L. and Zemcov, M. (2012) Cosmic Evolution of Star Formation Enhancement in Close Major-merger Galaxy Pairs Since z = 1. Astrophysical Journal, 760 (1). Art. No. 72. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20121218-105629072

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Abstract

The infrared (IR) emission of "M_* galaxies" (10^(10.4) ≤ M_(star) ≤ 10^(11.0) M_☉) in galaxy pairs, derived using data obtained in Herschel (PEP/HerMES) and Spitzer (S-COSMOS) surveys, is compared to that of single-disk galaxies in well-matched control samples to study the cosmic evolution of the star formation enhancement induced by galaxy-galaxy interaction. Both the mean IR spectral energy distribution and mean IR luminosity of star-forming galaxies (SFGs) in SFG+SFG (S+S) pairs in the redshift bin of 0.6 < z < 1 are consistent with no star formation enhancement. SFGs in S+S pairs in a lower redshift bin of 0.2 < z < 0.6 show marginal evidence for a weak star formation enhancement. Together with the significant and strong sSFR enhancement shown by SFGs in a local sample of S+S pairs (obtained using previously published Spitzer observations), our results reveal a trend for the star formation enhancement in S+S pairs to decrease with increasing redshift. Between z = 0 and z = 1, this decline of interaction-induced star formation enhancement occurs in parallel with the dramatic increase (by a factor of ~10) of the sSFR of single SFGs, both of which can be explained by the higher gas fraction in higher-z disks. SFGs in mixed pairs (S+E pairs) do not show any significant star formation enhancement at any redshift. The difference between SFGs in S+S pairs and in S+E pairs suggests a modulation of the sSFR by the intergalactic medium (IGM) in the dark matter halos hosting these pairs.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/760/1/72DOIArticle
http://iopscience.iop.org/0004-637X/760/1/72PublisherArticle
ORCID:
AuthorORCID
Cooray, A.0000-0002-3892-0190
Lu, N.0000-0002-8948-1044
Scoville, N.0000-0002-0438-3323
Zemcov, M.0000-0001-8253-1451
Additional Information:© 2012 American Astronomical Society. Received 2012 June 15; accepted 2012 October 3; published 2012 November 6. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Dr. Xianzhong Zheng is thanked for kindly providing the software and instructions for the “clean stacking.”We acknowledge support from the Science and Technology Facilities Council (grant No. ST/I000976/1). PACS has been developed by a consortium of institutes led by MPE (Germany) and including UVIE (Austria); KU Leuven, CSL, IMEC (Belgium); CEA, LAM (France); MPIA (Germany); INAF-IFSI/OAA/OAP/OAT, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX (Belgium), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy), and CICYT/MCYT (Spain). SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including: the University of Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, the University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCLMSSL, UKATC, the University of Sussex (UK); and Caltech, JPL, NHSC, the University of Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy);MCINN (Spain); SNSB (Sweden); STFC, UKSA (UK); and NASA (USA). The data presented in this paper will be released through the Herschel Database in Marseille (HeDaM, http://hedam.oamp.fr/HerMES).
Group:TAPIR, Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)ST/I000976/1
Bundesministerium für Verkehr, Innovation und Technologie (BMVIT)UNSPECIFIED
ESA-PRODEX (Belgium)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Deutsches Zentrum für Luft- und Raumfahrt (DLR)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
CICYT/MCYT (Spain)UNSPECIFIED
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
United Kingdom Space Agency (UKSA)UNSPECIFIED
NASAUNSPECIFIED
Istituto Nazionale di Astrofisica (INAF)UNSPECIFIED
Record Number:CaltechAUTHORS:20121218-105629072
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20121218-105629072
Official Citation:Cosmic Evolution of Star Formation Enhancement in Close Major-merger Galaxy Pairs Since z = 1 C. K. Xu, D. L. Shupe, M. Béthermin, H. Aussel, S. Berta, J. Bock, C. Bridge, A. Conley, A. Cooray, D. Elbaz, A. Franceschini, E. Le Floc'h, N. Lu, D. Lutz, B. Magnelli, G. Marsden, S. J. Oliver, F. Pozzi, L. Riguccini, B. Schulz, N. Scoville, M. Vaccari, J. D. Vieira, L. Wang, and M. Zemcov doi:10.1088/0004-637X/760/1/72
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36032
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Dec 2012 15:32
Last Modified:07 Oct 2017 02:32

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