2002A&A...396..773S


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET18:57:18

2002A&A...396..773S - Astronomy and Astrophysics, volume 396, 773-786 (2002/12-4)

Cluster of galaxies around seven radio-loud QSOs at 1<z<1.6. II. K-band images.

SANCHEZ S.F. and GONZALEZ-SERRANO J.I.

Abstract (from CDS):

We have conducted a NIR study of the environments of seven radio-loud quasars at redshifts 1<z<1.6. In present paper we describe deep K band images obtained for the fields of ∼6x6 arcmin around the quasars with 3σ limiting magnitudes of K∼20.5. These fields were previously studied using deep B and R band images (Sanchez & Gonzalez-Serrano, 1999A&A...352..383S). Using optical and NIR data together, a significant excess of galaxies has been found whose optical-NIR colours, luminosity, spatial scale, and number of galaxies are compatible with clusters at the redshift of the quasar. We have selected a sample of cluster candidates analyzing the R-K vs. K diagram. A ∼25% of the candidates present red optical-NIR colours and an ultraviolet excess. This population has been also found in clusters around quasars at the same redshifts (Tanaka et al., 2000ApJ...528..123T; Haines et al., 2001MNRAS.323..688H). These galaxies seem to follow a mixed evolution: a main passive evolution plus late star formation processes. The quasars do not inhabit the core of the clusters, being found in the outer regions. This result agrees with the hypothesis that the origin/feeding mechanism of the nuclear activity is merging processes. The quasars inhabit the region where a collision is most likely to produce a merger.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - quasars: general - radio continuum: galaxies

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 3C 186 QSO 07 44 17.4723761217 +37 53 17.249506697   17.5 18.14 17.2   ~ 285 1
2 7C 092634.39+384914.00 QSO 09 29 41.1634132446 +38 36 03.500405217   19.92 19.68     ~ 29 1
3 7C 112346.20+393513.00 QSO 11 26 27.9688889766 +39 18 44.743300109   18.18 17.88     ~ 33 1
4 6C 1148+3842 QSO 11 51 29.3609547833 +38 25 52.373278014   17.22 17.04     ~ 117 2
5 7C 120642.00+435600.00 Sy1 12 09 13.6107589417 +43 39 20.918674620   18.81 18.24     ~ 221 1
6 7C 131503.00+394115.00 QSO 13 17 18.6355049414 +39 25 28.140424368   18.45 18.20     ~ 52 1
7 6C 143532+382041 QSO 14 37 33.9278261422 +38 07 45.963148471   18.35 18.21     ~ 34 1

    Equat.    Gal    SGal    Ecl

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2021.03.07-18:57:18

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