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A gas-rich AGN near the centre of a galaxy cluster at z ~ 1.4 | | V. Casasola
; L. Magrini
; F. Combes
; A. Mignano
; E. Sani
; R. Paladino
; F. Fontani
; | | Date: |
17 Jul 2013 | | Abstract: | The formation of first virialized structures in overdensities dates back to
~9 Gyr ago, i.e., in the redshift range z ~ 1.4 - 1.6. At that epoch, some
models of structure formation predict that the star formation activity in
clusters was high, implying large reservoirs of cold molecular gas. Aiming at
finding a trace of such 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 neighborhood of the central radio
galaxy at a projected distance of ~780 kpc. 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
1.1 x 10^10 Msun, 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 SFR from Halpha flux obtaining
SFR~65 Msun/yr. This suggests that AGN.1317 is actively forming stars and would
exhaust its reservoir of cold gas in ~0.2-1.0 Gyr. | | Source: | arXiv, 1307.4576 | | Services: | Forum | Review | PDF | Favorites | |
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