SpringerLink
Forum Springer Astron. Astrophys.
Forum Whats New Search Orders


Astron. Astrophys. 345, 723-732 (1999)

Next Section Table of Contents

Thermal equilibrium of molecular clouds in cooling flow clusters

Denis Puy, Lukas Grenacher and Philippe Jetzer

1 Paul Scherrer Institute, Laboratory for Astrophysics, CH-5232 Villigen PSI, Switzerland
2 Institute of Theoretical Physics, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland

Received 3 August 1998 / Accepted 18 February 1999

Abstract

In many clusters of galaxies there is evidence for cooling flows in the central regions. The ultimate fate of the gas which cools is still unknown. A possibility is that a fraction of the gas forms cold molecular clouds. We investigate the minimum temperature which can be reached by clouds in cooling flows by computing the cooling function due to [FORMULA], HD and CO molecules. As an example, we determine the minimum temperature achievable by clouds in the cooling flows of the Centaurus, Hydra and PKS 0745-191 clusters. Our results suggest that clouds can reach very low temperatures - less than [FORMULA] K - which would explain the non-detection of CO in these clusters.

Key words: molecular processes – galaxies: clusters: general – galaxies: cooling flows – X-rays: general

Send offprint requests to: puy@physik.unizh.ch

SIMBAD Objects

Contents

Next Section Table of Contents

© European Southern Observatory (ESO) 1999

Online publication: April 28, 1999
helpdesk.link@springer.de