A2125 and its environs: Evidence for an X-ray-emitting hierarchical superstructure

Q. Daniel Wang; Andrew J. Connolly; Robert J. Brunner

doi:10.1086/310859

A2125 and its environs: Evidence for an X-ray-emitting hierarchical superstructure

Q. Daniel Wang, Andrew J. Connolly, Robert J. Brunner

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

Abstract

Based on a deep ROSAT/PSPC observation, we reveal an elongated complex of extended X-ray-emitting objects in and around the galaxy cluster A2125. Multicolor optical imaging of galaxies in the field suggests that this complex represents a hierarchical superstructure spanning ∼11 h₅₀^-1 Mpc at the redshift ∼0.247. The multiple peak X-ray morphology and large blue galaxy fraction of A2125 indicate that the cluster is undergoing a coalescence of subunits. The superstructure contains two additional clusters, projected at distances of only 3 and 4.3 h₅₀^-1 Mpc from A2125. The most interesting feature is, however, the low surface brightness X-ray emission from a moderate galaxy concentration away from individual clusters. The emission likely arises in a hot (∼10⁷ K) intergalactic medium, as predicted in N-body/hydro simulations of structure formation.

Original language	English (US)
Pages (from-to)	L13-L16
Journal	Astrophysical Journal
Volume	487
Issue number	1 PART II
DOIs	https://doi.org/10.1086/310859
State	Published - 1997
Externally published	Yes

Keywords

Cosmology: observations
Galaxies: clusters: general
Galaxies: clusters: individual (A2125)
Large-scale structure of universe
X-rays: general

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/310859

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title = "A2125 and its environs: Evidence for an X-ray-emitting hierarchical superstructure",

abstract = "Based on a deep ROSAT/PSPC observation, we reveal an elongated complex of extended X-ray-emitting objects in and around the galaxy cluster A2125. Multicolor optical imaging of galaxies in the field suggests that this complex represents a hierarchical superstructure spanning ∼11 h50-1 Mpc at the redshift ∼0.247. The multiple peak X-ray morphology and large blue galaxy fraction of A2125 indicate that the cluster is undergoing a coalescence of subunits. The superstructure contains two additional clusters, projected at distances of only 3 and 4.3 h50-1 Mpc from A2125. The most interesting feature is, however, the low surface brightness X-ray emission from a moderate galaxy concentration away from individual clusters. The emission likely arises in a hot (∼107 K) intergalactic medium, as predicted in N-body/hydro simulations of structure formation.",

keywords = "Cosmology: observations, Galaxies: clusters: general, Galaxies: clusters: individual (A2125), Large-scale structure of universe, X-rays: general",

author = "Wang, {Q. Daniel} and Connolly, {Andrew J.} and Brunner, {Robert J.}",

note = "Funding Information: 1Guest observer at the Kitt Peak National Observatory, National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA), under cooperative agreement with the National Science Foundation. Funding Information: We thank G. Bryan and J. Ostriker for valuable comments on the work and acknowledge the support by NASA under grants NAG-5-2716, NAG-5-2717 (Q. D. W.), and AR-06394 (A. J. C.), as well as the Graduate Student Researchers Program (R. J. B.).",

year = "1997",

doi = "10.1086/310859",

language = "English (US)",

volume = "487",

pages = "L13--L16",

journal = "Astrophysical Journal",

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publisher = "American Astronomical Society",

number = "1 PART II",

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TY - JOUR

T1 - A2125 and its environs

T2 - Evidence for an X-ray-emitting hierarchical superstructure

AU - Wang, Q. Daniel

AU - Connolly, Andrew J.

AU - Brunner, Robert J.

N1 - Funding Information: 1Guest observer at the Kitt Peak National Observatory, National Optical Astronomy Observatories, which is operated by the Association of Universities for Research in Astronomy, Inc. (AURA), under cooperative agreement with the National Science Foundation. Funding Information: We thank G. Bryan and J. Ostriker for valuable comments on the work and acknowledge the support by NASA under grants NAG-5-2716, NAG-5-2717 (Q. D. W.), and AR-06394 (A. J. C.), as well as the Graduate Student Researchers Program (R. J. B.).

PY - 1997

Y1 - 1997

N2 - Based on a deep ROSAT/PSPC observation, we reveal an elongated complex of extended X-ray-emitting objects in and around the galaxy cluster A2125. Multicolor optical imaging of galaxies in the field suggests that this complex represents a hierarchical superstructure spanning ∼11 h50-1 Mpc at the redshift ∼0.247. The multiple peak X-ray morphology and large blue galaxy fraction of A2125 indicate that the cluster is undergoing a coalescence of subunits. The superstructure contains two additional clusters, projected at distances of only 3 and 4.3 h50-1 Mpc from A2125. The most interesting feature is, however, the low surface brightness X-ray emission from a moderate galaxy concentration away from individual clusters. The emission likely arises in a hot (∼107 K) intergalactic medium, as predicted in N-body/hydro simulations of structure formation.

AB - Based on a deep ROSAT/PSPC observation, we reveal an elongated complex of extended X-ray-emitting objects in and around the galaxy cluster A2125. Multicolor optical imaging of galaxies in the field suggests that this complex represents a hierarchical superstructure spanning ∼11 h50-1 Mpc at the redshift ∼0.247. The multiple peak X-ray morphology and large blue galaxy fraction of A2125 indicate that the cluster is undergoing a coalescence of subunits. The superstructure contains two additional clusters, projected at distances of only 3 and 4.3 h50-1 Mpc from A2125. The most interesting feature is, however, the low surface brightness X-ray emission from a moderate galaxy concentration away from individual clusters. The emission likely arises in a hot (∼107 K) intergalactic medium, as predicted in N-body/hydro simulations of structure formation.

KW - Cosmology: observations

KW - Galaxies: clusters: general

KW - Galaxies: clusters: individual (A2125)

KW - Large-scale structure of universe

KW - X-rays: general

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A2125 and its environs: Evidence for an X-ray-emitting hierarchical superstructure

Abstract

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