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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559374.0, MPI für Astronomie / Publikationen_mpia
Identifying dynamically young galaxy groups via Wide-angle tail galaxies: A case study in the COSMOS field at z = 0.53
Authors:Oklopčić, A.; Smolčić, V.; Giodini, S.; Zamorani, G.; Bîrzan, L.; Schinnerer, E.; Carilli, C. L.; Finoguenov, A.; Lilly, S.; Koekemoer, A.; Scoville, N. Z.
Date of Publication (YYYY-MM-DD):2010
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:1
Start Page:484
End Page:490
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present an analysis of a wide-angle tail (WAT) radio galaxy located in a galaxy group in the COSMOS field at a redshift of z = 0.53 (hereafter CWAT-02). We find that the host galaxy of CWAT-02 is the brightest galaxy in the group although it does not coincide with the center of mass of the system. Estimating (1) the velocity of CWAT-02, relative to the intra-cluster medium, and (2) the line-of-sight peculiar velocity of CWAT-02's host galaxy, relative to the average velocity of the group, we find that both values are higher than those expected for a dominant galaxy in a relaxed system. This suggests that CWAT-02's host group is dynamically young and likely in the process of an ongoing group merger. Our results are consistent with previous findings showing that the presence of a WAT galaxy in a galaxy group or cluster can be used as an indicator of dynamically young non-relaxed systems. Taking the unrelaxed state of CWAT-02's host group into account, we discuss the impact of radio-active galactic nucleus (AGN) heating from CWAT-02 onto its environment, in the context of the missing baryon problem in galaxy groups. Our analysis strengthens recent results suggesting that radio-AGN heating may be powerful enough to expel baryons from galaxy groups. Based on observations with the National Radio Astronomy Observatory, which is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Free Keywords:cosmology: observations; galaxies: active; galaxies: evolution; galaxies: fundamental parameters; radio continuum: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2010ApJ...713..484O [ID No:1]
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