The XMM cluster survey: The dynamical state of XMMXCS J2215.9-1738 at z = 1.457

Matt Hilton; Chris A. Collins; S. Adam Stanford; Chris Lidman; Kyle S. Dawson; Michael Davidson; Scott T. Kay; Andrew R. Liddle; Robert G. Mann; Christopher J. Miller; Robert C. Nichol; A. Kathy Romer; Kivanc Sabirli; Pedro T.P. Viana; Michael J. West

doi:10.1086/522827

The XMM cluster survey: The dynamical state of XMMXCS J2215.9-1738 at z = 1.457

Matt Hilton^*, Chris A. Collins, S. Adam Stanford, Chris Lidman, Kyle S. Dawson, Michael Davidson, Scott T. Kay, Andrew R. Liddle, Robert G. Mann, Christopher J. Miller, Robert C. Nichol, A. Kathy Romer, Kivanc Sabirli, Pedro T.P. Viana, Michael J. West

^*Corresponding author for this work

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

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Abstract

We present new spectroscopic observations of the most distant X-ray-selected galaxy cluster currently known, XMMXCS J2215.9-1738 at z = 1.457, obtained with the DEIMOS instrument at the W. M. Keck Observatory and the FORS2 instrument on the ESO Very Large Telescope. Within the cluster virial radius, as estimated from the cluster X-ray properties, we increase the number of known spectroscopic cluster members to 17 objects, and calculate the line-of-sight velocity dispersion of the cluster to be 580 ± 140 km s^-1. We find mild evidence that the velocity distribution of galaxies within the virial radius deviates from a single Gaussian. We show that the properties of J2215.9-1738 are inconsistent with self-similar evolution of local X-ray scaling relations, finding that the cluster is underluminous given its X-ray temperature, and that the intracluster medium contains ∼2-3 times the kinetic energy per unit mass of the cluster galaxies. These results can perhaps be explained if the cluster is observed in the aftermath of an off-axis merger. Alternatively, heating of the intracluster medium through supernovae and/or active galactic nucleus activity, as is required to explain the observed slope of the local X-ray luminosity-temperature relation, may be responsible.

Original language	English
Pages (from-to)	1000-1009
Number of pages	10
Journal	Astrophysical Journal
Volume	670
Issue number	2
DOIs	https://doi.org/10.1086/522827
Publication status	Published - 1 Dec 2007
Externally published	Yes

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Hilton, M., Collins, C. A., Stanford, S. A., Lidman, C., Dawson, K. S., Davidson, M., Kay, S. T., Liddle, A. R., Mann, R. G., Miller, C. J., Nichol, R. C., Romer, A. K., Sabirli, K., Viana, P. T. P., & West, M. J. (2007). The XMM cluster survey: The dynamical state of XMMXCS J2215.9-1738 at z = 1.457. Astrophysical Journal, 670(2), 1000-1009. https://doi.org/10.1086/522827

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title = "The XMM cluster survey: The dynamical state of XMMXCS J2215.9-1738 at z = 1.457",

abstract = "We present new spectroscopic observations of the most distant X-ray-selected galaxy cluster currently known, XMMXCS J2215.9-1738 at z = 1.457, obtained with the DEIMOS instrument at the W. M. Keck Observatory and the FORS2 instrument on the ESO Very Large Telescope. Within the cluster virial radius, as estimated from the cluster X-ray properties, we increase the number of known spectroscopic cluster members to 17 objects, and calculate the line-of-sight velocity dispersion of the cluster to be 580 ± 140 km s-1. We find mild evidence that the velocity distribution of galaxies within the virial radius deviates from a single Gaussian. We show that the properties of J2215.9-1738 are inconsistent with self-similar evolution of local X-ray scaling relations, finding that the cluster is underluminous given its X-ray temperature, and that the intracluster medium contains ∼2-3 times the kinetic energy per unit mass of the cluster galaxies. These results can perhaps be explained if the cluster is observed in the aftermath of an off-axis merger. Alternatively, heating of the intracluster medium through supernovae and/or active galactic nucleus activity, as is required to explain the observed slope of the local X-ray luminosity-temperature relation, may be responsible.",

keywords = "Galaxies: clusters: individual (XMMXCS J2215.9-1738), X-rays: galaxies: clusters",

author = "Matt Hilton and Collins, {Chris A.} and Stanford, {S. Adam} and Chris Lidman and Dawson, {Kyle S.} and Michael Davidson and Kay, {Scott T.} and Liddle, {Andrew R.} and Mann, {Robert G.} and Miller, {Christopher J.} and Nichol, {Robert C.} and Romer, {A. Kathy} and Kivanc Sabirli and Viana, {Pedro T.P.} and West, {Michael J.}",

year = "2007",

month = dec,

day = "1",

doi = "10.1086/522827",

language = "English",

volume = "670",

pages = "1000--1009",

journal = "Astrophysical Journal",

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T2 - The dynamical state of XMMXCS J2215.9-1738 at z = 1.457

AU - Hilton, Matt

AU - Collins, Chris A.

AU - Stanford, S. Adam

AU - Lidman, Chris

AU - Dawson, Kyle S.

AU - Davidson, Michael

AU - Kay, Scott T.

AU - Liddle, Andrew R.

AU - Mann, Robert G.

AU - Miller, Christopher J.

AU - Nichol, Robert C.

AU - Romer, A. Kathy

AU - Sabirli, Kivanc

AU - Viana, Pedro T.P.

AU - West, Michael J.

PY - 2007/12/1

Y1 - 2007/12/1

N2 - We present new spectroscopic observations of the most distant X-ray-selected galaxy cluster currently known, XMMXCS J2215.9-1738 at z = 1.457, obtained with the DEIMOS instrument at the W. M. Keck Observatory and the FORS2 instrument on the ESO Very Large Telescope. Within the cluster virial radius, as estimated from the cluster X-ray properties, we increase the number of known spectroscopic cluster members to 17 objects, and calculate the line-of-sight velocity dispersion of the cluster to be 580 ± 140 km s-1. We find mild evidence that the velocity distribution of galaxies within the virial radius deviates from a single Gaussian. We show that the properties of J2215.9-1738 are inconsistent with self-similar evolution of local X-ray scaling relations, finding that the cluster is underluminous given its X-ray temperature, and that the intracluster medium contains ∼2-3 times the kinetic energy per unit mass of the cluster galaxies. These results can perhaps be explained if the cluster is observed in the aftermath of an off-axis merger. Alternatively, heating of the intracluster medium through supernovae and/or active galactic nucleus activity, as is required to explain the observed slope of the local X-ray luminosity-temperature relation, may be responsible.

AB - We present new spectroscopic observations of the most distant X-ray-selected galaxy cluster currently known, XMMXCS J2215.9-1738 at z = 1.457, obtained with the DEIMOS instrument at the W. M. Keck Observatory and the FORS2 instrument on the ESO Very Large Telescope. Within the cluster virial radius, as estimated from the cluster X-ray properties, we increase the number of known spectroscopic cluster members to 17 objects, and calculate the line-of-sight velocity dispersion of the cluster to be 580 ± 140 km s-1. We find mild evidence that the velocity distribution of galaxies within the virial radius deviates from a single Gaussian. We show that the properties of J2215.9-1738 are inconsistent with self-similar evolution of local X-ray scaling relations, finding that the cluster is underluminous given its X-ray temperature, and that the intracluster medium contains ∼2-3 times the kinetic energy per unit mass of the cluster galaxies. These results can perhaps be explained if the cluster is observed in the aftermath of an off-axis merger. Alternatively, heating of the intracluster medium through supernovae and/or active galactic nucleus activity, as is required to explain the observed slope of the local X-ray luminosity-temperature relation, may be responsible.

KW - Galaxies: clusters: individual (XMMXCS J2215.9-1738)

KW - X-rays: galaxies: clusters

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U2 - 10.1086/522827

DO - 10.1086/522827

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EP - 1009

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

The XMM cluster survey: The dynamical state of XMMXCS J2215.9-1738 at z = 1.457

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