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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 731668.0, MPI für Astronomie / Publikationen_mpia
The cluster-scale environment of PKS 2155-304
Authors:Farina, E. P.; Fumagalli, M.; Decarli, R.; Fanidakis, N.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:455
Issue / Number:1
Start Page:618
End Page:625
Audience:Not Specified
Abstract / Description:PKS 2155-304 is one of the brightest extragalactic source in the X-ray and EUV bands, and is a prototype for the BL Lac class of objects. In this paper, we investigate the large-scale environment of this source using new multi-object as well as long-slit spectroscopy, together with archival spectra and optical images. We find clear evidence of a modest overdensity of galaxies at z = 0.116 10 ± 0.000 06, consistent with previous determinations of the BL Lac redshift. The galaxy group has a radial velocity dispersion of 250^{+80}_{-40} km s-1 and a virial radius of 0.22 Mpc, yielding a role-of-thumb estimate of the virial mass of Mvir ˜ 1.5 × 1013 M, i.e. one order of magnitude less than that observed in similar objects. This result hints towards a relatively wide diversity in the environmental properties of BL Lac objects.
Free Keywords:BL Lacertae objects: individual: PKS 2155-304; galaxies: groups: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711
URL:http://cdsads.u-strasbg.fr/abs/2016MNRAS.455..618F
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