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; M. Zemcov

doi:10.1088/0004-637X/760/1/72

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. SchulzN. Scoville, M. Vaccari, J. D. Vieira, L. Wang, M. Zemcov

Research output: Contribution to journal › Article › peer-review

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.

Original language	English (US)
Article number	72
Journal	Astrophysical Journal
Volume	760
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/760/1/72
State	Published - Nov 20 2012
Externally published	Yes

Keywords

galaxies: evolution
galaxies: general
galaxies: interactions
galaxies: starburst

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Online availability

10.1088/0004-637X/760/1/72

Library availability

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Xu, C. K., Shupe, D. L., Béthermin, M., Aussel, H., Berta, S., Bock, J., Bridge, C., Conley, A., Cooray, A., Elbaz, D., Franceschini, A., Le Floc'H, E., Lu, N., Lutz, D., Magnelli, B., Marsden, G., Oliver, S. J., Pozzi, F., Riguccini, L., ... Zemcov, M. (2012). Cosmic evolution of star formation enhancement in close major-merger galaxy pairs since z = 1. Astrophysical Journal, 760(1), Article 72. https://doi.org/10.1088/0004-637X/760/1/72

Xu, CK, Shupe, DL, Béthermin, M, Aussel, H, Berta, S, Bock, J, Bridge, C, Conley, A, Cooray, A, Elbaz, D, Franceschini, A, Le Floc'H, E, Lu, N, Lutz, D, Magnelli, B, Marsden, G, Oliver, SJ, Pozzi, F, Riguccini, L, Schulz, B, Scoville, N, Vaccari, M, Vieira, JD, Wang, L & Zemcov, M 2012, 'Cosmic evolution of star formation enhancement in close major-merger galaxy pairs since z = 1', Astrophysical Journal, vol. 760, no. 1, 72. https://doi.org/10.1088/0004-637X/760/1/72

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title = "Cosmic evolution of star formation enhancement in close major-merger galaxy pairs since z = 1",

abstract = "The infrared (IR) emission of {"}M * galaxies{"} (1010.4 ≤ M star ≤ 1011.0 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.",

keywords = "galaxies: evolution, galaxies: general, galaxies: interactions, galaxies: starburst",

author = "Xu, {C. K.} and Shupe, {D. L.} and M. B{\'e}thermin and H. Aussel and S. Berta and J. Bock and C. Bridge and A. Conley and A. Cooray and D. Elbaz and A. Franceschini and {Le Floc'H}, E. and N. Lu and D. Lutz and B. Magnelli and G. Marsden and Oliver, {S. J.} and F. Pozzi and L. Riguccini and B. Schulz and N. Scoville and M. Vaccari and Vieira, {J. D.} and L. Wang and M. Zemcov",

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T1 - Cosmic evolution of star formation enhancement in close major-merger galaxy pairs since z = 1

AU - Xu, C. K.

AU - Shupe, D. L.

AU - Béthermin, M.

AU - Aussel, H.

AU - Berta, S.

AU - Bock, J.

AU - Bridge, C.

AU - Conley, A.

AU - Cooray, A.

AU - Elbaz, D.

AU - Franceschini, A.

AU - Le Floc'H, E.

AU - Lu, N.

AU - Lutz, D.

AU - Magnelli, B.

AU - Marsden, G.

AU - Oliver, S. J.

AU - Pozzi, F.

AU - Riguccini, L.

AU - Schulz, B.

AU - Scoville, N.

AU - Vaccari, M.

AU - Vieira, J. D.

AU - Wang, L.

AU - Zemcov, M.

PY - 2012/11/20

Y1 - 2012/11/20

N2 - The infrared (IR) emission of "M * galaxies" (1010.4 ≤ M star ≤ 1011.0 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.

AB - The infrared (IR) emission of "M * galaxies" (1010.4 ≤ M star ≤ 1011.0 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.

KW - galaxies: evolution

KW - galaxies: general

KW - galaxies: interactions

KW - galaxies: starburst

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JO - Astrophysical Journal

JF - Astrophysical Journal

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ER -

Cosmic evolution of star formation enhancement in close major-merger galaxy pairs since z = 1

Abstract

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