Supernovae contributions to metals in intra-cluster medium observed with Suzaku
Abstract
We studied the properties of the intra-cluster medium (ICM) in two clusters of galaxies (AWM 7 and Abell 1060) and two groups (HCG 62 and NGC 507) observed with the 5th Japanese X-ray astronomical satellite, Suzaku. We measured for the first time precise cumulative ICM metal masses and distributions for various elements, such as O, Ne, Mg, Si, S, Fe, within 0.1 and ~0.3 r180. Because of the good XIS sensitivity to emission lines, especially below 2 keV, we directly measured O and Mg line intensities and obtained abundances. Comparing our results with supernova nucleosynthesis models, the number ratio of Type II (SNe II) to Type Ia (SNe Ia) is estimated to be ~3.5, assuming the metal mass in the ICM is represented by the sum of products synthesized in SNe Ia and SNe II. Normalized by the K-band luminosities of present galaxies, and including the metals in stars, the integrated number of past SNe II explosions is estimated to be close to or somewhat higher than the star formation rate determined from Hubble Deep Field observations.
- Publication:
-
Origin of Matter and Evolution of Galaxies
- Pub Date:
- May 2008
- DOI:
- 10.1063/1.2943599
- Bibcode:
- 2008AIPC.1016..367S
- Keywords:
-
- 98.58.Mj;
- 36.40.-c;
- 97.80.Jp;
- Supernova remnants;
- Atomic and molecular clusters;
- X-ray binaries