A2125 and Its Environs: Evidence for an X-Ray–emitting Hierarchical Superstructure | Zendy

Q. Daniel Wang | Zendy; Andrew J. Connolly | Zendy; Róbert Brunner | Zendy

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A2125 and Its Environs: Evidence for an X-Ray–emitting Hierarchical Superstructure

Author(s) -

Q. Daniel Wang,

Andrew J. Connolly,

Róbert Brunner

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310859

Subject(s) - rosat , astrophysics , surface brightness , galaxy , physics , cluster (spacecraft) , superstructure , galaxy cluster , redshift , astronomy , computer science , thermodynamics , programming language

Based on a deep ROSAT/PSPC observation, we reveal an elongated complex ofextended X-ray-emitting objects in and around the galaxy cluster A2125.Multicolor optical imaging of galaxies in the field suggests that this complexrepresents a hierarchical superstructure spanning about 11 Mpc at redshift z =0.247. The multi-peak X-ray morphology of A2125 suggests that the cluster is anongoing coalescence of at least three major subunits. The dynamical youth ofthis cluster is consistent with its large fraction of blue galaxies observed byButcher & Oemler. The superstructure contains two additional clusters,projected at distances of only 3 and 4.3 Mpc from A2125. But the mostinteresting feature is the low-surface-brightness X-ray emission from amoderate galaxy concentration not associated with individual clusters. Theemission likely arises in a hot intergalactic medium, as predicted inN-body/hydro simulations of structure formation.

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