X-Ray bright active galactic nuclei in massive galaxy clusters - II. The fraction of galaxies hosting active nuclei

S. Ehlert; A. von der Linden; S. W. Allen; W. N. Brandt; Y. Q. Xue; B. Luo; A. Mantz; R. G. Morris; D. Applegate; P. Kelly

doi:10.1093/mnras/stt2025

X-Ray bright active galactic nuclei in massive galaxy clusters - II. The fraction of galaxies hosting active nuclei

S. Ehlert^*, A. von der Linden, S. W. Allen, W. N. Brandt, Y. Q. Xue, B. Luo, A. Mantz, R. G. Morris, D. Applegate, P. Kelly

^*Corresponding author for this work

DARK

26 Citations (Scopus)

Abstract

We present a measurement of the fraction of cluster galaxies hosting X-ray bright active galactic nuclei (AGN) as a function of clustercentric distance scaled in units of r₅₀₀. Our analysis employs high-quality Chandra X-ray and Subaru optical imaging for 42 massive X-ray-selected galaxy cluster fields spanning the redshift range 0.2 < z < 0.7. In total, our study involves 176 AGN with bright (R < 23) optical counterparts above a 0.5-8.0 keV flux limit of 10^-14 erg cm^-2 s^-1. When excluding central dominant galaxies from the calculation, we measure a cluster galaxy AGN fraction in the central regions of the clusters that is~3 times lower than the field value. This fraction increases with clustercentric distance before becoming consistent with the field at ~2.5r₅₀₀. Our data exhibit similar radial trends to those observed for star formation and optically selected AGN in cluster member galaxies, both of which are also suppressed near cluster centres to a comparable extent. These results strongly support the idea that X-ray AGN activity and strong star formation are linked through their common dependence on available reservoirs of cold gas.

Original language	English
Article number	stt2025
Journal	Monthly Notices of the Royal Astronomical Society
Volume	437
Issue number	2
Pages (from-to)	1942-1949
Number of pages	8
ISSN	0035-8711
DOIs	https://doi.org/10.1093/mnras/stt2025
Publication status	Published - 1 Nov 2013

Keywords

Galaxies: Active
Galaxies: Clusters: General
Galaxies: Photometry
X-rays: Galaxies
Xrays: Galaxies: Clusters

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Ehlert, S., von der Linden, A., Allen, S. W., Brandt, W. N., Xue, Y. Q., Luo, B., Mantz, A., Morris, R. G., Applegate, D., & Kelly, P. (2013). X-Ray bright active galactic nuclei in massive galaxy clusters - II. The fraction of galaxies hosting active nuclei. Monthly Notices of the Royal Astronomical Society, 437(2), 1942-1949. [stt2025]. https://doi.org/10.1093/mnras/stt2025

Ehlert, S, von der Linden, A, Allen, SW, Brandt, WN, Xue, YQ, Luo, B, Mantz, A, Morris, RG, Applegate, D & Kelly, P 2013, 'X-Ray bright active galactic nuclei in massive galaxy clusters - II. The fraction of galaxies hosting active nuclei', Monthly Notices of the Royal Astronomical Society, vol. 437, no. 2, stt2025, pp. 1942-1949. https://doi.org/10.1093/mnras/stt2025

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title = "X-Ray bright active galactic nuclei in massive galaxy clusters - II. The fraction of galaxies hosting active nuclei",

abstract = "We present a measurement of the fraction of cluster galaxies hosting X-ray bright active galactic nuclei (AGN) as a function of clustercentric distance scaled in units of r500. Our analysis employs high-quality Chandra X-ray and Subaru optical imaging for 42 massive X-ray-selected galaxy cluster fields spanning the redshift range 0.2 < z < 0.7. In total, our study involves 176 AGN with bright (R < 23) optical counterparts above a 0.5-8.0 keV flux limit of 10-14 erg cm-2 s-1. When excluding central dominant galaxies from the calculation, we measure a cluster galaxy AGN fraction in the central regions of the clusters that is~3 times lower than the field value. This fraction increases with clustercentric distance before becoming consistent with the field at ~2.5r500. Our data exhibit similar radial trends to those observed for star formation and optically selected AGN in cluster member galaxies, both of which are also suppressed near cluster centres to a comparable extent. These results strongly support the idea that X-ray AGN activity and strong star formation are linked through their common dependence on available reservoirs of cold gas.",

keywords = "Galaxies: Active, Galaxies: Clusters: General, Galaxies: Photometry, X-rays: Galaxies, Xrays: Galaxies: Clusters",

author = "S. Ehlert and {von der Linden}, A. and Allen, {S. W.} and Brandt, {W. N.} and Xue, {Y. Q.} and B. Luo and A. Mantz and Morris, {R. G.} and D. Applegate and P. Kelly",

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AU - Ehlert, S.

AU - von der Linden, A.

AU - Allen, S. W.

AU - Brandt, W. N.

AU - Xue, Y. Q.

AU - Luo, B.

AU - Mantz, A.

AU - Morris, R. G.

AU - Applegate, D.

AU - Kelly, P.

PY - 2013/11/1

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N2 - We present a measurement of the fraction of cluster galaxies hosting X-ray bright active galactic nuclei (AGN) as a function of clustercentric distance scaled in units of r500. Our analysis employs high-quality Chandra X-ray and Subaru optical imaging for 42 massive X-ray-selected galaxy cluster fields spanning the redshift range 0.2 < z < 0.7. In total, our study involves 176 AGN with bright (R < 23) optical counterparts above a 0.5-8.0 keV flux limit of 10-14 erg cm-2 s-1. When excluding central dominant galaxies from the calculation, we measure a cluster galaxy AGN fraction in the central regions of the clusters that is~3 times lower than the field value. This fraction increases with clustercentric distance before becoming consistent with the field at ~2.5r500. Our data exhibit similar radial trends to those observed for star formation and optically selected AGN in cluster member galaxies, both of which are also suppressed near cluster centres to a comparable extent. These results strongly support the idea that X-ray AGN activity and strong star formation are linked through their common dependence on available reservoirs of cold gas.

AB - We present a measurement of the fraction of cluster galaxies hosting X-ray bright active galactic nuclei (AGN) as a function of clustercentric distance scaled in units of r500. Our analysis employs high-quality Chandra X-ray and Subaru optical imaging for 42 massive X-ray-selected galaxy cluster fields spanning the redshift range 0.2 < z < 0.7. In total, our study involves 176 AGN with bright (R < 23) optical counterparts above a 0.5-8.0 keV flux limit of 10-14 erg cm-2 s-1. When excluding central dominant galaxies from the calculation, we measure a cluster galaxy AGN fraction in the central regions of the clusters that is~3 times lower than the field value. This fraction increases with clustercentric distance before becoming consistent with the field at ~2.5r500. Our data exhibit similar radial trends to those observed for star formation and optically selected AGN in cluster member galaxies, both of which are also suppressed near cluster centres to a comparable extent. These results strongly support the idea that X-ray AGN activity and strong star formation are linked through their common dependence on available reservoirs of cold gas.

KW - Galaxies: Active

KW - Galaxies: Clusters: General

KW - Galaxies: Photometry

KW - X-rays: Galaxies

KW - Xrays: Galaxies: Clusters

U2 - 10.1093/mnras/stt2025

DO - 10.1093/mnras/stt2025

M3 - Journal article

AN - SCOPUS:84890932106

SN - 0035-8711

VL - 437

SP - 1942

EP - 1949

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 2

M1 - stt2025

ER -

X-Ray bright active galactic nuclei in massive galaxy clusters - II. The fraction of galaxies hosting active nuclei

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Keywords

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