2008A&A...482..771L


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.18CEST20:14:41

2008A&A...482..771L - Astronomy and Astrophysics, volume 482, 771-775 (2008/5-2)

Clustering environment of BL Lacertae object RGB 1745+398.

LIETZEN H., NILSSON K., TAKALO L.O., HEINAEMAEKI P., NURMI P., KEINAENEN P. and WAGNER S.

Abstract (from CDS):

The BL Lac object RGB 1745+398 lies in an environment that makes it possible to study the cluster around it more deeply than the environments of other BL Lac objects. The cluster centered on the BL Lac works as a strong gravitational lens, forming a large arc around itself. The aim of this paper is to study the environment and characteristics of this object more accurately than the environments of other BL Lac objects have been before. We measured the redshifts of galaxies in the cluster from the absorption lines in their spectra. The velocity dispersion was then obtained from the redshifts. The gravitational lensing was used for measuring the mass at the center of the cluster. The mass of the whole cluster could then be estimated using the softened isothermal sphere mass distribution. Finally, the richness of the cluster was determined by counting the number of galaxies near the BL Lac object and obtaining the galaxy-BL Lac spatial covariance function, Bgb. The redshifts of nine galaxies in the field were measured to be near the redshift of the BL Lac object, confirming the presence of a cluster. The average redshift of the cluster is 0.268, and the velocity dispersion (470+190–110)km/s. The mass of the cluster is M500=(4+3–2)x1014M, which implies a rather massive cluster. The richness measurement also suggests that this is a rich cluster: the result for covariance function is Bgb=(600±200)Mpc1.77, which corresponds to Abell richness class 1 and which is consistent with the mass and velocity dispersion of the cluster.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: individual: RGB 1745+398 - galaxies: clusters: general - gravitational lensing

Nomenclature: Fig.1, Table 1: [LNT2008] A (Nos A-I).

CDS comments: RGB 1745+398 = RGB J1745+398 in SIMBAD.

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 QSO B0414+009 BLL 04 16 52.4945787354 +01 05 23.896410061   16.86 16.38 16   ~ 235 0
2 QSO B0548-322 BLL 05 50 40.5706739558 -32 16 16.488658537   16.07 15.5     ~ 357 1
3 QSO B1517+656 BLL 15 17 47.5884450040 +65 25 23.284362137     15.9 16.7   ~ 98 1
4 PG 1633+099 HS* 16 35 24.0242205151 +09 47 49.892841991 13.215 14.205 14.396 14.481 14.609 sdB 103 0
5 2MASX J17453776+3951309 BLL 17 45 37.7542717866 +39 51 30.933910274     18.30 15.9   ~ 40 1
6 [NTP99] Arc LeI 17 45 38.110 +39 51 23.80           ~ 4 0
7 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1513 1
8 [LNT2008] G GiC ~ ~   21.70   19.12   ~ 1 0
9 [LNT2008] A GiC ~ ~   20.98   18.29   ~ 1 0
10 [LNT2008] C GiC ~ ~   23.51   20.12   ~ 1 0
11 [LNT2008] F GiC ~ ~   20.42   18.28   ~ 1 0
12 [LNT2008] B GiC ~ ~   20.81   18.21   ~ 1 0
13 [LNT2008] E G ~ ~   21.44   18.86   ~ 3 0
14 [LNT2008] D G ~ ~   18.85   17.23   ~ 3 0
15 [LNT2008] I GiC ~ ~   21.29   18.75   ~ 1 0
16 [LNT2008] H GiC ~ ~   20.58   17.90   ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.08.18-20:14:41

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