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Issue A&A
Volume 374, Number 1, July IV 2001
Page(s) 28 - 35
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20010616



A&A 374, 28-35 (2001)
DOI: 10.1051/0004-6361:20010616

ASCA observations of massive medium-distant clusters of galaxies. II.

H. Matsumoto1, M. Pierre2, T. G. Tsuru3 and D. S. Davis1

1  Center for Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, NE80, Cambridge, MA 02139-4307, USA
2  CEA/DSM/DAPNIA, Service d'Astrophysique, 91191 Gif-sur-Yvette, France
3  Department of Physics, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan

(Received 25 August 2000 / Accepted 27 April 2001 )

Abstract
We have selected seven medium-distant clusters of galaxies ( $z \sim 0.1$-0.3) for multi-wavelength observations with the goal of investigating their dynamical state. Following Paper I (Pierre et al. 1999) which reported the ASCA results about two of them, we present here the analysis of the ASCA observations of the other five clusters; RX J1023.8-2715 ( A 3444 ), RX J1031.6-2607 , RX J1050.5-0236 ( A 1111 ), RX J1203.2-2131 ( A 1451 ), and RX J1314.5-2517 . Except for RX J1031.6, whose X-ray emission turned out to be dominated by an AGN, the ASCA spectra are well fitted by a one-temperature thin thermal plasma model. We compare the temperature-luminosity relation of our clusters with that of nearby ones (z< 0.1). Two clusters, RX J1050.5 and RX J1023.8, show larger luminosities than the bulk of clusters at similar temperatures, which suggests the presence of a cooling flow. The temperature vs. iron-abundance relationship of our sample is consistent with that of nearby clusters.


Key words: galaxies: clusters: general -- cosmology: observations -- X-rays: galaxies

Offprint request: H. Matsumoto, matumoto@space.mit.edu

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© ESO 2001


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