Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...455..497i&link_type=abstract
Astrophysical Journal v.455, p.497
Astronomy and Astrophysics
Astronomy
23
Galaxies: Cooling Flows, Galaxies: Clusters: Individual Alphanumeric: 2A 0335+096, Galaxies: Intergalactic Medium, X-Rays: Galaxies
Scientific paper
The 2A 0335+096 cluster of galaxies was observed in X-rays with the Position Sensitive Proportional Counter (PSPC) and the High Resolution Imager (HRI) on ROSAT Spatially resolved X-ray spectra show a decrease in the ambient temperature of the X-ray emitting gas in the inner regions of the cluster, indicative of a cooling flow. The spectra also confirm the presence of an absorbing column density in excess of the measured Galactic value toward the cooling flow region, which must be intrinsic to the cluster. The mass of this absorbing matter is 7.4 × 1011 Msun within 170 kpc of the center of the cluster. A deprojection of the surface brightness profile combined with the observed temperature profile yields electron density, gas and gravitational mass, and mass deposition rate profiles. Within 1.2 Mpc the total gravitating mass is 1.9 × 1014 Msun. A cooling rate of 400+90 -65 Msun yr-1 is found within the cooling radius of 166 +2188 kpc. This value is consistent with the cooling rate obtained by fitting a cooling flow model to the spectrum of the central 166 kpc. Although the cooling rate is proportional to radius for the inner 60 kpc, it is essentially constant beyond this point, which suggests that the gas cools homogeneously in this region. A similar result was found for the NGC 5044 group of galaxies by David et al. (1994). This disagrees with earlier observations of other clusters, which suggested that the gas within the entire cooling flow region was inhomogeneous.
Irwin Jimmy A.
Sarazin Craig L.
No associations
LandOfFree
ROSAT X-Ray Observations of the 2A 0335+096 Cluster of Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with ROSAT X-Ray Observations of the 2A 0335+096 Cluster of Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ROSAT X-Ray Observations of the 2A 0335+096 Cluster of Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1258298