The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies

K. Brand; A. Dey; D. Weedman; V. Desai; E. L.E. Floc'H; B. T. Jannuzi; B. T. Soifer; M. J.I. Brown; P. Eisenhardt; V. Gorjian; C. Papovich; H. A. Smith; S. P. Willner; R. J. Cool

doi:10.1086/503416

The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies

K. Brand, A. Dey, D. Weedman, V. Desai, E. L.E. Floc'H, B. T. Jannuzi, B. T. Soifer, M. J.I. Brown, P. Eisenhardt, V. Gorjian, C. Papovich, H. A. Smith, S. P. Willner, R. J. Cool

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

78 Scopus citations

Abstract

We determine the contribution of AGN to the mid-IR emission of luminous infrared galaxies (LIRGs) at z > 0.6 by measuring the mid-IR dust continuum slope of 20,039 mid-IR sources. The 24 μm sources are selected from a Spitzer MIPS survey of the NOAO Deep Wide-Field Survey Boötes field and have corresponding 8 μm data from the IRAC Shallow Survey. There is a clear bimodal distribution in the 24 to 8 μm flux ratio. The X-ray-detected sources fall within the peak corresponding to a flat spectrum in vf _v, implying that it is populated by AGN-dominated LIRGs, whereas the peak corresponding to a higher 24 to 8 μm flux ratio is likely due to LIRGs whose IR emission is powered by starbursts. The 24 μm emission is increasingly dominated by AGN at higher 24 μm flux densities (f ₂₄): the AGN fraction of the z > 0.6 sources increases from 9% at f₂₄ ≈ 0.35 mJy to 74% ±20% at f₂₄ ≈ 3 mJy, in good agreement with model predictions. Deep 24 μm, small-area surveys, like GOODS, will be strongly dominated by starburst galaxies. AGN are responsible for ∼3%-7% of the total 24 μm background.

Original language	English (US)
Pages (from-to)	143-147
Number of pages	5
Journal	Astrophysical Journal
Volume	644
Issue number	1
DOIs	https://doi.org/10.1086/503416
State	Published - Jun 10 2006
Externally published	Yes

Keywords

Galaxies: active
Galaxies: starburst
Infrared: galaxies
X-rays

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/503416

Fingerprint Dive into the research topics of 'The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies'. Together they form a unique fingerprint.

Cite this

Brand, K., Dey, A., Weedman, D., Desai, V., Floc'H, E. L. E., Jannuzi, B. T., Soifer, B. T., Brown, M. J. I., Eisenhardt, P., Gorjian, V., Papovich, C., Smith, H. A., Willner, S. P., & Cool, R. J. (2006). The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies. Astrophysical Journal, 644(1), 143-147. https://doi.org/10.1086/503416

The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies. / Brand, K.; Dey, A.; Weedman, D.; Desai, V.; Floc'H, E. L.E.; Jannuzi, B. T.; Soifer, B. T.; Brown, M. J.I.; Eisenhardt, P.; Gorjian, V.; Papovich, C.; Smith, H. A.; Willner, S. P.; Cool, R. J.

In: Astrophysical Journal, Vol. 644, No. 1, 10.06.2006, p. 143-147.

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

Brand, K. ; Dey, A. ; Weedman, D. ; Desai, V. ; Floc'H, E. L.E. ; Jannuzi, B. T. ; Soifer, B. T. ; Brown, M. J.I. ; Eisenhardt, P. ; Gorjian, V. ; Papovich, C. ; Smith, H. A. ; Willner, S. P. ; Cool, R. J. / The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies. In: Astrophysical Journal. 2006 ; Vol. 644, No. 1. pp. 143-147.

@article{8cc81ab93dee417ea4fe5c6ac9210867,

title = "The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies",

abstract = "We determine the contribution of AGN to the mid-IR emission of luminous infrared galaxies (LIRGs) at z > 0.6 by measuring the mid-IR dust continuum slope of 20,039 mid-IR sources. The 24 μm sources are selected from a Spitzer MIPS survey of the NOAO Deep Wide-Field Survey Bo{\"o}tes field and have corresponding 8 μm data from the IRAC Shallow Survey. There is a clear bimodal distribution in the 24 to 8 μm flux ratio. The X-ray-detected sources fall within the peak corresponding to a flat spectrum in vf v, implying that it is populated by AGN-dominated LIRGs, whereas the peak corresponding to a higher 24 to 8 μm flux ratio is likely due to LIRGs whose IR emission is powered by starbursts. The 24 μm emission is increasingly dominated by AGN at higher 24 μm flux densities (f 24): the AGN fraction of the z > 0.6 sources increases from 9% at f24 ≈ 0.35 mJy to 74% ±20% at f24 ≈ 3 mJy, in good agreement with model predictions. Deep 24 μm, small-area surveys, like GOODS, will be strongly dominated by starburst galaxies. AGN are responsible for ∼3%-7% of the total 24 μm background.",

keywords = "Galaxies: active, Galaxies: starburst, Infrared: galaxies, X-rays",

author = "K. Brand and A. Dey and D. Weedman and V. Desai and Floc'H, {E. L.E.} and Jannuzi, {B. T.} and Soifer, {B. T.} and Brown, {M. J.I.} and P. Eisenhardt and V. Gorjian and C. Papovich and Smith, {H. A.} and Willner, {S. P.} and Cool, {R. J.}",

year = "2006",

month = jun,

day = "10",

doi = "10.1086/503416",

language = "English (US)",

volume = "644",

pages = "143--147",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1",

}

TY - JOUR

T1 - The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies

AU - Brand, K.

AU - Dey, A.

AU - Weedman, D.

AU - Desai, V.

AU - Floc'H, E. L.E.

AU - Jannuzi, B. T.

AU - Soifer, B. T.

AU - Brown, M. J.I.

AU - Eisenhardt, P.

AU - Gorjian, V.

AU - Papovich, C.

AU - Smith, H. A.

AU - Willner, S. P.

AU - Cool, R. J.

PY - 2006/6/10

Y1 - 2006/6/10

N2 - We determine the contribution of AGN to the mid-IR emission of luminous infrared galaxies (LIRGs) at z > 0.6 by measuring the mid-IR dust continuum slope of 20,039 mid-IR sources. The 24 μm sources are selected from a Spitzer MIPS survey of the NOAO Deep Wide-Field Survey Boötes field and have corresponding 8 μm data from the IRAC Shallow Survey. There is a clear bimodal distribution in the 24 to 8 μm flux ratio. The X-ray-detected sources fall within the peak corresponding to a flat spectrum in vf v, implying that it is populated by AGN-dominated LIRGs, whereas the peak corresponding to a higher 24 to 8 μm flux ratio is likely due to LIRGs whose IR emission is powered by starbursts. The 24 μm emission is increasingly dominated by AGN at higher 24 μm flux densities (f 24): the AGN fraction of the z > 0.6 sources increases from 9% at f24 ≈ 0.35 mJy to 74% ±20% at f24 ≈ 3 mJy, in good agreement with model predictions. Deep 24 μm, small-area surveys, like GOODS, will be strongly dominated by starburst galaxies. AGN are responsible for ∼3%-7% of the total 24 μm background.

AB - We determine the contribution of AGN to the mid-IR emission of luminous infrared galaxies (LIRGs) at z > 0.6 by measuring the mid-IR dust continuum slope of 20,039 mid-IR sources. The 24 μm sources are selected from a Spitzer MIPS survey of the NOAO Deep Wide-Field Survey Boötes field and have corresponding 8 μm data from the IRAC Shallow Survey. There is a clear bimodal distribution in the 24 to 8 μm flux ratio. The X-ray-detected sources fall within the peak corresponding to a flat spectrum in vf v, implying that it is populated by AGN-dominated LIRGs, whereas the peak corresponding to a higher 24 to 8 μm flux ratio is likely due to LIRGs whose IR emission is powered by starbursts. The 24 μm emission is increasingly dominated by AGN at higher 24 μm flux densities (f 24): the AGN fraction of the z > 0.6 sources increases from 9% at f24 ≈ 0.35 mJy to 74% ±20% at f24 ≈ 3 mJy, in good agreement with model predictions. Deep 24 μm, small-area surveys, like GOODS, will be strongly dominated by starburst galaxies. AGN are responsible for ∼3%-7% of the total 24 μm background.

KW - Galaxies: active

KW - Galaxies: starburst

KW - Infrared: galaxies

KW - X-rays

UR - http://www.scopus.com/inward/record.url?scp=33747070759&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33747070759&partnerID=8YFLogxK

U2 - 10.1086/503416

DO - 10.1086/503416

M3 - Article

AN - SCOPUS:33747070759

VL - 644

SP - 143

EP - 147

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

ER -

The active galactic nuclei contribution to the mid-infrared emission of luminous infrared galaxies

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Cite this