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http://hdl.handle.net/20.500.12386/26244
Titolo: | The cluster-scale environment of PKS 2155-304 | Autori: | Farina, E. P. Fumagalli, M. DECARLI, ROBERTO Fanidakis, N. |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 455 | Fascicolo: | 1 | Da pagina:: | 618 | 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 = 0.116 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<SUP>-1</SUP> and a virial radius of 0.22 Mpc, yielding a role-of-thumb estimate of the virial mass of M<SUB>vir</SUB> ∼ 1.5 × 10<SUP>13</SUP> M<SUB>☉</SUB>, 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. | URI: | http://hdl.handle.net/20.500.12386/26244 | URL: | https://academic.oup.com/mnras/article/455/1/618/984306 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stv2277 | Bibcode ADS: | 2016MNRAS.455..618F | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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