SIMBAD references

2016MNRAS.455..618F - Mon. Not. R. Astron. Soc., 455, 618-625 (2016/January-1)

The cluster-scale environment of PKS 2155-304.

FARINA E.P., FUMAGALLI M., DECARLI R. and FANIDAKIS N.

Abstract (from CDS):

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±0.00006, consistent with previous determinations of the BL Lac redshift. The galaxy group has a radial velocity dispersion of 250^+80_-40 km/s and a virial radius of 0.22 Mpc, yielding a role-of-thumb estimate of the virial mass of Mvir ∼ 1.5x1013 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.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): BL Lacertae objects: individual: PKS 2155-304 - galaxies: groups: general

Nomenclature: Tables 1-2: [FFD2016] NN N=18 among (Nos 8-29), [FFD2016] Neb N=1.

Simbad objects: 27

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2019.12.15-22:04:30

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