Issue |
A&A
Volume 489, Number 1, October I 2008
|
|
---|---|---|
Page(s) | 101 - 104 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:200810262 | |
Published online | 23 July 2008 |
Search for cold gas along radio lobes in the cooling core galaxies MS0735.6+7421 and M87
1
Institut de Radio Astronomie Millimétrique (IRAM), Domaine Universitaire, 300 rue de la piscine, 38400 St Martin d'Hères, France e-mail: salome@iram.fr
2
LERMA, Observatoire de Paris, 61 av. de l'Observatoire, 75014 Paris, France
Received:
26
May
2008
Accepted:
30
June
2008
We report CO observations towards MS0735.6+7421 a distant
cooling core galaxy, and towards M87, the nearest cooling core in
the center of the Virgo cluster. Both galaxies contain radio
cavities that are thought to be responsible for the heating that can
regulate or stop the cooling of the surrounding gas. In this
feedback process, there could still be some gas cooling along
filaments, along the borders of the radio cavities. Molecular gas
is known to exist in clusters with cooling cores, in long and thin
filaments that can be formed behind the rising bubbles inflated by
the central AGN. CO emission was searched for at several locations
along the radio lobes of those two galaxies, but only upper limits
were found. These correspond to cold gas mass limits of a few
109 for each pointing in MS0735.6+7421, and a few
106
in M87. This non detection means that either the
cooling is strongly reduced by the AGN feedback or that the gas is
cooling in very localized places like thin filaments, possibly
diluted in the large beam for MS0735.6+7421. For M87, the AGN
heating appears to have stopped the cooling completely.
Key words: cooling flows / galaxies: elliptical and lenticular, cD / galaxies: individual: MS0735.6+7421 / galaxies: individual: M87 / cosmology: observations
© ESO, 2008
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