2013A&A...558A..60C


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.19CEST11:39:00

2013A&A...558A..60C - Astronomy and Astrophysics, volume 558A, 60-60 (2013/10-1)

A gas-rich AGN near the centre of a galaxy cluster at z ∼1.4.

CASASOLA V., MAGRINI L., COMBES F., MIGNANO A., SANI E., PALADINO R. and FONTANI F.

Abstract (from CDS):

The formation of the first virialized structures in overdensities dates back to ∼9Gyr ago, i.e. in the redshift range z∼1.4-1.6. Some models of structure formation predict that the star formation activity in clusters was high at that epoch, implying large reservoirs of cold molecular gas. Aiming at finding a trace of this expected high molecular gas content in primeval clusters, we searched for the 12CO(2-1) line emission in the most luminous active galactic nucleus (AGN) of the cluster around the radio galaxy 7C 1756+6520 at z∼1.4, one of the farthest spectroscopic confirmed clusters. This AGN, called AGN.1317, is located in the neighbourhood of the central radio galaxy at a projected distance of ∼780kpc. The IRAM Plateau de Bure Interferometer was used to investigate the molecular gas quantity in AGN.1317, observing the 12CO(2-1) emission line. We detect CO emission in an AGN belonging to a galaxy cluster at z∼1.4. We measured a molecular gas mass of 1.1x1010M, comparable to that found in submillimeter galaxies. In optical images, AGN.1317 does not seem to be part of a galaxy interaction or merger. We also derived the nearly instantaneous star formation rate (SFR) from Hα flux obtaining a SFR ∼65M/yr. This suggests that AGN.1317 is actively forming stars and will exhaust its reservoir of cold gas in ∼0.2-1.0Gyr.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: AGN 1317 - galaxies: clusters: individual: 7C 1756+6520 - galaxies: distances and redshifts - galaxies: high-redshift - galaxies: ISM

VizieR on-line data: <Available at CDS (J/A+A/558/A60): co21.fits>

Simbad objects: 10

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Number of rows : 10

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 ZwCl 0024+1652 ClG 00 26 36.0 +17 08 36     18.35     ~ 596 1
2 ClG J0926+1242 ClG 09 26 36.6 +12 42 59           ~ 30 0
3 NAME Spiderweb Galaxy AGN 11 40 48.3 -26 29 09     22.00     ~ 242 1
4 QSO B1202-074 QSO 12 05 23.12 -07 42 32.4     17.5     ~ 342 5
5 ClG J1416+4446 ClG 14 16 28.1 +44 46 38           ~ 41 0
6 7C 1716+6839 QSO 17 16 13.9368525850 +68 36 38.742970991   18.99 18.16 17.67   ~ 90 1
7 [GSS2010] Cl1756.10 G 17 56 55.750 +65 19 07.00           ~ 5 0
8 NVSS J175705+651953 rG 17 57 05.5 +65 19 54           ~ 28 2
9 ICRF J184916.0+670541 Sy1 18 49 16.07228978 +67 05 41.6802978     20 17.45   ~ 208 1
10 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1973 1

    Equat.    Gal    SGal    Ecl

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2019.09.19-11:39:00

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