Long-term optical photometric monitoring of the quasar SDSS J153259.96−003944.1 |
| |
| Authors: | C S Stalin R Srianand |
| |
| Institution: | Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;National Radio Astronomy Observatory, PO Box 0, Socorro, NM 87801, USA |
| |
| Abstract: | We present results from an observation of the luminous cluster of galaxies Abell 2204 using the Chandra X-ray Observatory. We show the core of the cluster has a complex morphological structure, made up of a high-density core ( n e～ 0.2 cm?3) with flat surface brightness, a surrounding central plateau, a tail-like feature, wrapping around to the east, and an unusual radio source. A temperature map and deprojected profile shows that the temperature rises steeply outside these regions, until around ～100 kpc where it drops, then rises again. Abundance maps and profiles show that there is a corresponding increase in abundance at the same radius as where the temperature drops. In addition, there are two cold fronts at radii of ～28 and 54.5 kpc. The disturbed morphology indicates that the cluster core may have undergone a merger. However, despite this disruption, the mean radiative cooling time in the centre is short (～230 Myr) and the morphology is regular on large scales. |
| |
| Keywords: | galaxies: clusters: individual: Abell 2204 X-rays: galaxies |
|
|
