Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3912m&link_type=abstract
American Astronomical Society, HEAD meeting #12, #39.12
Astronomy and Astrophysics
Astronomy
Scientific paper
Using an ultra-deep (574 ks) Chandra observation of M87, the central galaxy in the Virgo Cluster, we present the best measurements to date of the distribution of metals in the central intracluster medium (ICM). Our measurements, made in 36 independent annuli with 250,000 counts each, extend out to a radius r 40 kpc and show that the abundance profiles of Fe, Si, S, Ar, Ca, Ne, Mg, and Ni are all centrally peaked. Interestingly, the abundance profiles of Si and S - which are measured robustly and to high precision - are even more centrally peaked than Fe, while the Si/S ratio is relatively flat. These measurements challenge the standard picture of chemical enrichment in galaxy clusters, wherein type Ia supernovae (SN Ia) from an evolved stellar population are thought to dominate the central enrichment. Rather, the integrated relative contribution of core-collapse supernovae (SNcc) to the chemical enrichment is higher in the central, low-entropy core than in the surrounding ICM. We discuss processes that might have contributed to the observed radial profiles.
Allen Stephanie
Million Evan T.
Simionescu Aurora
Werner Norbert
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