GMRT detection of HI 21 cm-line absorption from the peculiar galaxy in Abell 2125 |
| |
Authors: | K. S. Dwarakanath F. N. Owen |
| |
Affiliation: | (1) Raman Research Institute, 560 080 Bangalore, India;(2) National Radio Astronomy Observatory, 87801 Socorro, NM, USA |
| |
Abstract: | Using the recently completed Giant Meterwave Radio Telescope, we have detected the HI 21 cm-line absorption from the peculiar galaxy C153 in the galaxy cluster Abell 2125. The HI absorption is at a redshift of 0.2533, with a peak optical depth of 0.36. The full width at half minimum of the absorption line is 100 km s−1. The estimated column density of atomic Hydrogen is 0.7×1022(T s /100) cm−2. The HI absorption is redshifted by ∼400km s−1 compared to the [OIII] emission line from this system. We attribute this to an infalling cold gas or to an out-flowing ionised gas, or to a combination of both as a consequence of tidal interactions of C153 with either a cluster galaxy or the cluster potential. |
| |
Keywords: | Galaxies: active galaxies: clusters: individual (A2125) galaxies: star-burst radio lines: galaxies |
本文献已被 SpringerLink 等数据库收录! |