Multi-wavelength observations of an evolved galaxy group: An endpoint of galaxy merging?
| dc.creator | Jones, L. R. | |
| dc.creator | Ponman, T. J. | |
| dc.creator | Forbes, Duncan A. | |
| dc.date | 1999-10-05 | |
| dc.date.accessioned | 2026-07-07T02:33:42Z | |
| dc.date.available | 2026-07-07T02:33:42Z | |
| dc.description | The group of galaxies RXJ1340.6+4018 has approximately the same bolometric X-ray luminosity as other bright galaxy groups and poor clusters such as the Virgo cluster. However, 70% of the optical luminosity of the group comes from a dominant giant elliptical galaxy, compared to 5% from M87 in Virgo. The second brightest galaxy in RXJ1340.6+4018 is a factor of 10 fainter (2.5 mag) than the dominant elliptical, and the galaxy luminosity function has a gap at about L*. We interpret the properties of the system as a result of galaxy merging within a galaxy group. We find that the central galaxy lies on the fundamental plane of ellipticals, has an undisturbed, non-cD morphology, and has no spectral features indicative of recent star formation, suggesting that the last major merger occurred >4 Gyr ago. The deviation of the system from the cluster Lx-T relation in the opposite sense to most groups may be due to an early epoch of formation of the group or due to a strong cooling flow. The unusual elongation of the X-ray isophotes and the similarity between the X-ray and optical ellipticities at large radii (~230 kpc) suggest that both the X-ray gas and the outermost stars of the dominant galaxy are responding to an elongated dark matter distribution. RXJ1340.6+4018 may be part of a filamentary structure related to infall in the outskirts of the cluster A1774. | |
| dc.description | 13 pages, 12 figures, to appear in MNRAS | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9910090 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9910090 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/14947 | |
| dc.subject | Astrophysics | |
| dc.title | Multi-wavelength observations of an evolved galaxy group: An endpoint of galaxy merging? | |
| dc.type | text |