X-ray study of the NGC 383 group of galaxies and the source 1E0104+3153
| dc.creator | Komossa, Stefanie | |
| dc.creator | Boehringer, Hans | |
| dc.date | 1999-02-12 | |
| dc.date.accessioned | 2026-07-25T13:29:24Z | |
| dc.description | (abridged) We present results from an analysis of the X-ray properties of the NGC 383 galaxy group based on ROSAT PSPC and HRI data. X-ray emission can be traced out to ~ 1 Mpc, the estimated virial radius of the system. We determine a total mass of 6x10^{13} M_sun for the group inside this radius with a gas mass fraction of 21%. The intragroup-gas temperature of 1.5 keV is both consistent with the galaxy velocity dispersion and the X-ray luminosity-temperature relation of groups and clusters suggesting that the group is fairly relaxed. This is also indicated by the almost spherically symmetric appearance of the group's X-ray halo. The X-ray properties of the radio galaxy NGC 383 (3C 31) which is located near the center of the group are discussed. Its spectrum is best described by a two-component model, consisting of emission from a low-temperature Raymond-Smith plasma, and a hard tail. The possible interaction of the radio jets of 3C 31 with the IGM is studied. A spatial, spectral and temporal analysis of the Einstein source 1E0104+3153 located within the field of view is performed, one goal being the identification of the optical counterpart (with both, a high-redshift BAL quasar and a nearby elliptical galaxy, member of a small group, located within the Einstein X-ray error circle). We find evidence that the IGM of the small group contributes significantly to the X-ray emission of 1E0104, which can be described by a Raymond-Smith model of kT ~ 2 keV and a soft X-ray luminosity of L_x ~ 3 10^{43} erg/s. | |
| dc.description | 13 pages incl. 12 figures, A&A, in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9902192 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9902192 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/17727 | |
| dc.subject | Astrophysics | |
| dc.title | X-ray study of the NGC 383 group of galaxies and the source 1E0104+3153 | |
| dc.type | text |