AEGIS: Host galaxy morphologies of X-ray-selected and infrared-selected active galactic nuclei at 0.2 ≤ z < 1.2

C. M. Pierce; J. M. Lotz; E. S. Laird; L. Lin; K. Nandra; J. R. Primack; S. M. Faber; P. Barmby; S. Q. Park; S. P. Willner; S. Gwyn; D. C. Koo; A. L. Coil; M. C. Cooper; A. Georgakakis; A. M. Koekemoer; K. G. Noeske; B. J. Weiner; C. N.A. Willmer

doi:10.1086/517922

AEGIS: Host galaxy morphologies of X-ray-selected and infrared-selected active galactic nuclei at 0.2 ≤ z < 1.2

C. M. Pierce, J. M. Lotz, E. S. Laird, L. Lin, K. Nandra, J. R. Primack, S. M. Faber, P. Barmby, S. Q. Park, S. P. Willner, S. Gwyn, D. C. Koo, A. L. Coil, M. C. Cooper, A. Georgakakis, A. M. Koekemoer, K. G. Noeske, B. J. Weiner, C. N.A. Willmer

Steward Observatory

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

100 Scopus citations

Abstract

We visually and quantitatively determine the host galaxy morphologies of 94 intermediate-redshift (0.2 ≤ z < 1.2) active galactic nuclei (AGNs), selected using Chandra X-ray data and Spitzer mid-infrared data in the Extended Groth Strip. Using recently developed morphology measures, the second-order moment of the brightest 20% of a galaxy's flux (M₂₀) and the Gini coefficient, we find that X-ray-selected AGNs mostly reside in E/S0/Sa galaxies (53_-10⁺¹¹%), while IR-selected AGNs show no clear preference for host morphology. X-ray-selected AGN hosts are members of close pairs more often than the field population by a factor of 3.3 ± 1.4, but most of these pair members appear to be undisturbed early-type galaxies and do not tend to show direct evidence of gravitational perturbations or interactions. Thus, the activation mechanism for AGN activity remains unknown, even for pair members.

Original language	English (US)
Pages (from-to)	L19-L22
Journal	Astrophysical Journal
Volume	660
Issue number	1 II
DOIs	https://doi.org/10.1086/517922
State	Published - May 1 2007

Keywords

Galaxies: active
Galaxies: interactions
Galaxies: nuclei
Infrared: galaxies
X-rays: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/517922

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Pierce, C. M., Lotz, J. M., Laird, E. S., Lin, L., Nandra, K., Primack, J. R., Faber, S. M., Barmby, P., Park, S. Q., Willner, S. P., Gwyn, S., Koo, D. C., Coil, A. L., Cooper, M. C., Georgakakis, A., Koekemoer, A. M., Noeske, K. G., Weiner, B. J., & Willmer, C. N. A. (2007). AEGIS: Host galaxy morphologies of X-ray-selected and infrared-selected active galactic nuclei at 0.2 ≤ z < 1.2. Astrophysical Journal, 660(1 II), L19-L22. https://doi.org/10.1086/517922

Pierce, CM, Lotz, JM, Laird, ES, Lin, L, Nandra, K, Primack, JR, Faber, SM, Barmby, P, Park, SQ, Willner, SP, Gwyn, S, Koo, DC, Coil, AL, Cooper, MC, Georgakakis, A, Koekemoer, AM, Noeske, KG, Weiner, BJ & Willmer, CNA 2007, 'AEGIS: Host galaxy morphologies of X-ray-selected and infrared-selected active galactic nuclei at 0.2 ≤ z < 1.2', Astrophysical Journal, vol. 660, no. 1 II, pp. L19-L22. https://doi.org/10.1086/517922

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title = "AEGIS: Host galaxy morphologies of X-ray-selected and infrared-selected active galactic nuclei at 0.2 ≤ z < 1.2",

abstract = "We visually and quantitatively determine the host galaxy morphologies of 94 intermediate-redshift (0.2 ≤ z < 1.2) active galactic nuclei (AGNs), selected using Chandra X-ray data and Spitzer mid-infrared data in the Extended Groth Strip. Using recently developed morphology measures, the second-order moment of the brightest 20% of a galaxy's flux (M20) and the Gini coefficient, we find that X-ray-selected AGNs mostly reside in E/S0/Sa galaxies (53-10+11%), while IR-selected AGNs show no clear preference for host morphology. X-ray-selected AGN hosts are members of close pairs more often than the field population by a factor of 3.3 ± 1.4, but most of these pair members appear to be undisturbed early-type galaxies and do not tend to show direct evidence of gravitational perturbations or interactions. Thus, the activation mechanism for AGN activity remains unknown, even for pair members.",

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

author = "Pierce, {C. M.} and Lotz, {J. M.} and Laird, {E. S.} and L. Lin and K. Nandra and Primack, {J. R.} and Faber, {S. M.} and P. Barmby and Park, {S. Q.} and Willner, {S. P.} and S. Gwyn and Koo, {D. C.} and Coil, {A. L.} and Cooper, {M. C.} and A. Georgakakis and Koekemoer, {A. M.} and Noeske, {K. G.} and Weiner, {B. J.} and Willmer, {C. N.A.}",

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T2 - Host galaxy morphologies of X-ray-selected and infrared-selected active galactic nuclei at 0.2 ≤ z < 1.2

AU - Pierce, C. M.

AU - Lotz, J. M.

AU - Laird, E. S.

AU - Lin, L.

AU - Nandra, K.

AU - Primack, J. R.

AU - Faber, S. M.

AU - Barmby, P.

AU - Park, S. Q.

AU - Willner, S. P.

AU - Gwyn, S.

AU - Koo, D. C.

AU - Coil, A. L.

AU - Cooper, M. C.

AU - Georgakakis, A.

AU - Koekemoer, A. M.

AU - Noeske, K. G.

AU - Weiner, B. J.

AU - Willmer, C. N.A.

PY - 2007/5/1

Y1 - 2007/5/1

N2 - We visually and quantitatively determine the host galaxy morphologies of 94 intermediate-redshift (0.2 ≤ z < 1.2) active galactic nuclei (AGNs), selected using Chandra X-ray data and Spitzer mid-infrared data in the Extended Groth Strip. Using recently developed morphology measures, the second-order moment of the brightest 20% of a galaxy's flux (M20) and the Gini coefficient, we find that X-ray-selected AGNs mostly reside in E/S0/Sa galaxies (53-10+11%), while IR-selected AGNs show no clear preference for host morphology. X-ray-selected AGN hosts are members of close pairs more often than the field population by a factor of 3.3 ± 1.4, but most of these pair members appear to be undisturbed early-type galaxies and do not tend to show direct evidence of gravitational perturbations or interactions. Thus, the activation mechanism for AGN activity remains unknown, even for pair members.

AB - We visually and quantitatively determine the host galaxy morphologies of 94 intermediate-redshift (0.2 ≤ z < 1.2) active galactic nuclei (AGNs), selected using Chandra X-ray data and Spitzer mid-infrared data in the Extended Groth Strip. Using recently developed morphology measures, the second-order moment of the brightest 20% of a galaxy's flux (M20) and the Gini coefficient, we find that X-ray-selected AGNs mostly reside in E/S0/Sa galaxies (53-10+11%), while IR-selected AGNs show no clear preference for host morphology. X-ray-selected AGN hosts are members of close pairs more often than the field population by a factor of 3.3 ± 1.4, but most of these pair members appear to be undisturbed early-type galaxies and do not tend to show direct evidence of gravitational perturbations or interactions. Thus, the activation mechanism for AGN activity remains unknown, even for pair members.

KW - Galaxies: active

KW - Galaxies: interactions

KW - Galaxies: nuclei

KW - Infrared: galaxies

KW - X-rays: galaxies

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JF - Astrophysical Journal

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ER -

AEGIS: Host galaxy morphologies of X-ray-selected and infrared-selected active galactic nuclei at 0.2 ≤ z < 1.2

Abstract

Keywords

ASJC Scopus subject areas

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