2016MNRAS.455..618F

Query : 2016MNRAS.455..618F

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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Number of rows : 27
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PKS J0449-4350 BLL 04 49 24.6981911928 -43 50 08.960970948 14.95 17.52 15.24 16.27   ~ 190 1
2 PKS J0550-3216 BLL 05 50 40.5705144672 -32 16 16.484718648   16.07 15.5     ~ 424 1
3 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
4 RX J1517.7+6525 BLL 15 17 47.5882526184 +65 25 23.285593704       16.7   ~ 131 1
5 7C 174359.60+395236.00 BLL 17 45 37.7544298992 +39 51 30.936584340     18.30 15.9   ~ 65 2
6 PKS J2009-4849 BLL 20 09 25.3903899240 -48 49 53.725051056   15.75 12.81 11.41   ~ 604 1
7 [FFD2016] 29 G 21 58 27.60 -30 14 16.0   21.53   19.15   ~ 1 0
8 [FFD2016] 21 G 21 58 34.5399821016 -30 16 07.807624356   21.80 20.85 20.98   ~ 1 0
9 [FFD2016] 19 G 21 58 37.91 -30 15 43.5   21.04 19.84 19.36   ~ 1 0
10 [PWC2011] J215841.5-301505 G 21 58 41.59 -30 15 05.8   20.75 19.25 18.92   ~ 2 0
11 [YWP2010] 329.688-30.277 G 21 58 44.87 -30 16 34.5   18.00 17.50     ~ 4 0
12 [FFD2016] 11 G 21 58 46.16 -30 10 43.6   21.32 20.10 19.81   ~ 1 0
13 [FFD2016] 15 G 21 58 48.05 -30 12 18.3   21.65 19.78 19.14   ~ 1 0
14 [FFD2016] 13 G 21 58 50.13 -30 11 47.1   22.21 20.26 19.76   ~ 1 0
15 NAME PKS 2155-304 Group GrG 21 58 52.0651817803 -30 13 32.120657891           ~ 1 0
16 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1
17 [FGM91] G1 G 21 58 52.38 -30 13 30.5           ~ 4 0
18 [FGM91] G5 G 21 58 52.633 -30 13 31.36           ~ 2 0
19 [FGM91] G6 G 21 58 52.697 -30 13 22.83           ~ 2 0
20 [FGM91] G2 G 21 58 53.33 -30 13 44.6   19.93 18.55 18.29   ~ 5 0
21 [FFD2016] 12 G 21 58 54.56 -30 11 34.6   21.59 20.38 20.21   ~ 1 0
22 [FFD2016] 17 G 21 58 56.36 -30 13 07.8   22.00 20.42 19.59   ~ 1 0
23 [PWC2011] J215900.2-301555 G 21 59 00.2116150488 -30 15 56.080131120   19.87 18.57 18.23   ~ 2 0
24 2dFGRS TGS331Z168 G 21 59 03.1960671120 -30 12 05.269602744   19.29 18.11 17.74   ~ 4 0
25 2dFGRS TGS331Z164 G 21 59 12.70 -30 11 32.0   19.26   18.20   ~ 2 0
26 2dFGRS TGS330Z077 G 21 59 31.1202534696 -30 16 15.327708312   18.28   16.54   ~ 4 0
27 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 673 1

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