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- W2272783549 abstract "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=0.11610, consistent with previous determinations of the BL Lac redshift. The galaxy group has a radial velocity dispersion of 250km/s and a virial radius of 0.22Mpc, yielding a role-of-thumb estimate of the virial mass of M(vir)~1.5x10$^{13}$Msun, i.e., one order of magnitude less than what observed in other similar objects. This result hints toward a relatively wide diversity in the environmental properties of BL Lac objects." @default.
- W2272783549 created "2016-06-24" @default.
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- W2272783549 date "2015-11-05" @default.
- W2272783549 modified "2023-10-14" @default.
- W2272783549 title "The cluster-scale environment of PKS 2155−304" @default.
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- W2272783549 doi "https://doi.org/10.1093/mnras/stv2277" @default.
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