1. Cosmic Evolution of Star Formation Enhancement in Close Major-merger Galaxy Pairs Since z = 1
- Author
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L. Riguccini, James J. Bock, Alberto Franceschini, Gaelen Marsden, David Elbaz, Carrie Bridge, C. K. Xu, Lian-Tao Wang, Francesca Pozzi, Bernhard Schulz, N. Z. Scoville, A. Cooray, Dieter Lutz, Matthieu Béthermin, Benjamin Magnelli, Seb Oliver, Michael Zemcov, E. Le Floc'h, David L. Shupe, Herve Aussel, Nanyao Y. Lu, A. Conley, S. Berta, Joaquin Vieira, Mattia Vaccari, 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
- Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,010504 meteorology & atmospheric sciences ,Infrared ,Dark matter ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,Physical cosmology ,Luminosity ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,galaxies: evolution – galaxies: general – galaxies: interactions – galaxies: starburst ,010303 astronomy & astrophysics ,Astrophysics::Galaxy Astrophysics ,QB ,0105 earth and related environmental sciences ,Physics ,Star formation ,Astronomy and Astrophysics ,Galaxy ,Redshift ,Space and Planetary Science ,Halo ,Astrophysics::Earth and Planetary Astrophysics ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
The infrared (IR) emission of M_* galaxies (10^{10.4} < M_{star} < 10^{11.0} M_\sun) 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 SED 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 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 inter-galactic medium IGM in the dark matter halos (DMH) hosting these pairs., 7 pages, 4 figures; accepted by ApJ
- Published
- 2012