AEGIS: Enhancement of dust-enshrouded star formation in close galaxy pairs and merging galaxies up to z ∼ 1

Lin Lihwai; David C. Koo; Benjamin J. Weiner; Tzihong Chiueh; Alison L. Coil; Jennifer Lotz; Christopher J. Conselice; S. P. Willner; H. A. Smith; Puragra Guhathakurta; J. S. Huang; Emeric Le Floc'h; Kai G. Noeske; Christopher N.A. Willmer; Michael C. Cooper; Andrew C. Phillips

doi:10.1086/517919

AEGIS: Enhancement of dust-enshrouded star formation in close galaxy pairs and merging galaxies up to z ∼ 1

Lin Lihwai, David C. Koo, Benjamin J. Weiner, Tzihong Chiueh, Alison L. Coil, Jennifer Lotz, Christopher J. Conselice, S. P. Willner, H. A. Smith, Puragra Guhathakurta, J. S. Huang, Emeric Le Floc'h, Kai G. Noeske, Christopher N.A. Willmer, Michael C. Cooper, Andrew C. Phillips

Steward Observatory

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

78 Scopus citations

Abstract

Using data from the DEEP2 Galaxy Redshift Survey and HST/ACS imaging in the Extended Groth Strip, we select nearly 100 interacting galaxy systems, including kinematic close pairs and morphologically identified merging galaxies. Spitzer MIPS 24 μm fluxes of these systems reflect the current dusty star formation activity, and at a fixed stellar mass (M*) the median infrared luminosity (L_IR) among merging galaxies and close pairs of blue galaxies is twice (1.9 plusmn; 0.4) that of control pairs drawn from isolated blue galaxies. Enhancement declines with galaxy separation, being strongest in close pairs and mergers and weaker in wide pairs compared to the control sample. At z̄ ∼ 0.9, 7.1% ± 4.3% of massive interacting galaxies (M* > 2 × 10¹⁰ M_⊙) are found to be ULIRGs, compared to 2.6% ± 0.7% in the control sample. The large spread of L_IR/M* among interacting galaxies suggests that this enhancement may depend on the merger stage as well as other as yet unidentified factors (e.g., galaxy structure, mass ratio, orbital characteristics, presence of AGN or bar). The contribution of interacting systems to the total IR luminosity density is moderate (≲36%).

Original language	English (US)
Pages (from-to)	L51-L54
Journal	Astrophysical Journal
Volume	660
Issue number	1 II
DOIs	https://doi.org/10.1086/517919
State	Published - May 1 2007

Keywords

Galaxies: evolution
Galaxies: interactions
Infrared: galaxies
Large-scale structure of universe

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/517919

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Lihwai, L., Koo, D. C., Weiner, B. J., Chiueh, T., Coil, A. L., Lotz, J., Conselice, C. J., Willner, S. P., Smith, H. A., Guhathakurta, P., Huang, J. S., Le Floc'h, E., Noeske, K. G., Willmer, C. N. A., Cooper, M. C., & Phillips, A. C. (2007). AEGIS: Enhancement of dust-enshrouded star formation in close galaxy pairs and merging galaxies up to z ∼ 1. Astrophysical Journal, 660(1 II), L51-L54. https://doi.org/10.1086/517919

Lihwai, L, Koo, DC, Weiner, BJ, Chiueh, T, Coil, AL, Lotz, J, Conselice, CJ, Willner, SP, Smith, HA, Guhathakurta, P, Huang, JS, Le Floc'h, E, Noeske, KG, Willmer, CNA, Cooper, MC & Phillips, AC 2007, 'AEGIS: Enhancement of dust-enshrouded star formation in close galaxy pairs and merging galaxies up to z ∼ 1', Astrophysical Journal, vol. 660, no. 1 II, pp. L51-L54. https://doi.org/10.1086/517919

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title = "AEGIS: Enhancement of dust-enshrouded star formation in close galaxy pairs and merging galaxies up to z ∼ 1",

abstract = "Using data from the DEEP2 Galaxy Redshift Survey and HST/ACS imaging in the Extended Groth Strip, we select nearly 100 interacting galaxy systems, including kinematic close pairs and morphologically identified merging galaxies. Spitzer MIPS 24 μm fluxes of these systems reflect the current dusty star formation activity, and at a fixed stellar mass (M*) the median infrared luminosity (LIR) among merging galaxies and close pairs of blue galaxies is twice (1.9 plusmn; 0.4) that of control pairs drawn from isolated blue galaxies. Enhancement declines with galaxy separation, being strongest in close pairs and mergers and weaker in wide pairs compared to the control sample. At {\=z} ∼ 0.9, 7.1% ± 4.3% of massive interacting galaxies (M* > 2 × 1010 M⊙) are found to be ULIRGs, compared to 2.6% ± 0.7% in the control sample. The large spread of LIR/M* among interacting galaxies suggests that this enhancement may depend on the merger stage as well as other as yet unidentified factors (e.g., galaxy structure, mass ratio, orbital characteristics, presence of AGN or bar). The contribution of interacting systems to the total IR luminosity density is moderate (≲36%).",

keywords = "Galaxies: evolution, Galaxies: interactions, Infrared: galaxies, Large-scale structure of universe",

author = "Lin Lihwai and Koo, {David C.} and Weiner, {Benjamin J.} and Tzihong Chiueh and Coil, {Alison L.} and Jennifer Lotz and Conselice, {Christopher J.} and Willner, {S. P.} and Smith, {H. A.} and Puragra Guhathakurta and Huang, {J. S.} and {Le Floc'h}, Emeric and Noeske, {Kai G.} and Willmer, {Christopher N.A.} and Cooper, {Michael C.} and Phillips, {Andrew C.}",

year = "2007",

month = may,

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doi = "10.1086/517919",

language = "English (US)",

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T1 - AEGIS

T2 - Enhancement of dust-enshrouded star formation in close galaxy pairs and merging galaxies up to z ∼ 1

AU - Lihwai, Lin

AU - Koo, David C.

AU - Weiner, Benjamin J.

AU - Chiueh, Tzihong

AU - Coil, Alison L.

AU - Lotz, Jennifer

AU - Conselice, Christopher J.

AU - Willner, S. P.

AU - Smith, H. A.

AU - Guhathakurta, Puragra

AU - Huang, J. S.

AU - Le Floc'h, Emeric

AU - Noeske, Kai G.

AU - Willmer, Christopher N.A.

AU - Cooper, Michael C.

AU - Phillips, Andrew C.

PY - 2007/5/1

Y1 - 2007/5/1

N2 - Using data from the DEEP2 Galaxy Redshift Survey and HST/ACS imaging in the Extended Groth Strip, we select nearly 100 interacting galaxy systems, including kinematic close pairs and morphologically identified merging galaxies. Spitzer MIPS 24 μm fluxes of these systems reflect the current dusty star formation activity, and at a fixed stellar mass (M*) the median infrared luminosity (LIR) among merging galaxies and close pairs of blue galaxies is twice (1.9 plusmn; 0.4) that of control pairs drawn from isolated blue galaxies. Enhancement declines with galaxy separation, being strongest in close pairs and mergers and weaker in wide pairs compared to the control sample. At z̄ ∼ 0.9, 7.1% ± 4.3% of massive interacting galaxies (M* > 2 × 1010 M⊙) are found to be ULIRGs, compared to 2.6% ± 0.7% in the control sample. The large spread of LIR/M* among interacting galaxies suggests that this enhancement may depend on the merger stage as well as other as yet unidentified factors (e.g., galaxy structure, mass ratio, orbital characteristics, presence of AGN or bar). The contribution of interacting systems to the total IR luminosity density is moderate (≲36%).

AB - Using data from the DEEP2 Galaxy Redshift Survey and HST/ACS imaging in the Extended Groth Strip, we select nearly 100 interacting galaxy systems, including kinematic close pairs and morphologically identified merging galaxies. Spitzer MIPS 24 μm fluxes of these systems reflect the current dusty star formation activity, and at a fixed stellar mass (M*) the median infrared luminosity (LIR) among merging galaxies and close pairs of blue galaxies is twice (1.9 plusmn; 0.4) that of control pairs drawn from isolated blue galaxies. Enhancement declines with galaxy separation, being strongest in close pairs and mergers and weaker in wide pairs compared to the control sample. At z̄ ∼ 0.9, 7.1% ± 4.3% of massive interacting galaxies (M* > 2 × 1010 M⊙) are found to be ULIRGs, compared to 2.6% ± 0.7% in the control sample. The large spread of LIR/M* among interacting galaxies suggests that this enhancement may depend on the merger stage as well as other as yet unidentified factors (e.g., galaxy structure, mass ratio, orbital characteristics, presence of AGN or bar). The contribution of interacting systems to the total IR luminosity density is moderate (≲36%).

KW - Galaxies: evolution

KW - Galaxies: interactions

KW - Infrared: galaxies

KW - Large-scale structure of universe

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JF - Astrophysical Journal

IS - 1 II

ER -

AEGIS: Enhancement of dust-enshrouded star formation in close galaxy pairs and merging galaxies up to z ∼ 1

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