NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-11-14 T00:31:42 PST
Help | Comment | NED Home

For refcode 1996PASJ...48..395F:
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Astronomical Society of Japan. 1996PASJ...48..395F Metal Abundance of an X-Ray Emitting Gas in Two Groups of Galaxies: The NGC 5044 Group and HCG 51 Yasushi FUKAZAWA, Kazuo MAKISHIMA, Kyoko MATSUSHITA Noriko YAMASAKI, Takaya OHASHI, Richard F. MUSHOTZKY Yasuhiro SAKIMA, Yoshiyuki TSUSAKA, and Koujun YAMASHITA Department of Physics, School of Science, University of Tokyo, 7-8-1 Hongo, Bunkyo-ku, Tokyo 118 E-mail(YF): fukazawa@miranda.phys.s.u- tokyo.ac.jp Department of Physics, Faculty of Science, Tokyo Metroplitan University, Hachioji, Tokyo, 192-08 Code 666, NASA/ Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A. Department of Physics, Faculty of Science, Nagoya University, furocho, chikusa-ku, Nagoya 464-01 Institute for Molecular Science, Okazaki, Aichi 444 (Received 1995 November 21; accepted 1996 April 16) Abstract We observed two groups of galaxies, the NGC 5044 group (WP 23) and Hickson's compact group HCG 51, with ASCA. We detected an extended bright soft X-ray emission, which indicates the existence of large amounts of a hot X-ray emitting gas in both targets. The temperature of the hot gas is 1 keV for both objects, which is equivalent to their galaxy velocity dispersion. The metal abundance of the gas is 0.3-0.5 solar value for both objects, which is similar to that of rich clusters of galaxies. The Si to Fe abundance ratio is smaller than that of rich clusters of galaxies, although the iron abundances determined by the Fe-L lines are somewhat uncertain. The X-ray luminosities in the 0.5-10 keV band are 1 x 10^43^ erg s^-1^ and 5 x 10^42^ erg s^-1^ for the NGC 5044 group and HCG 51, respectively, which are higher by an order of magnitude than those of X-ray bright elliptical galaxies. This makes HCG 51 one of the most X-ray luminous compact groups. Both objects have a total gravitating mass of M_total_ ~ 2.0 x 10^13^ M_sun_, and a gas mass and a galaxy mass of M_gas_ ~ M_galaxy_ ~ 1.5 x 10^12^ M_sun_. The ratios among these mass components are M_gas_/M_galaxy_ ~ 1 and (M_gas_ + M_galaxy_)/M_total_~ 0.2 within ~350 kpc for both objects. The latter is similar to previous ROSAT results for many groups of galaxies, while the former is larger than the average value of the ROSAT-observed groups. Moreover, the metal abundances of the present two groups are significantly higher than those of the NGC 2300 group and HCG 62, and are comparable to those of clusters. These suggest that the hot-gas mass and metal abundances can scatter widely among groups, compared to the small variance found among rich clusters. Key words: Galaxies: abundances - Galaxies: clusters of - Galaxies: individual (NGC 5044, HCG 51) - Galaxies: intergalactic medium
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home