Chemical enrichment of the ICM within the virgo cluster - I. Radial profiles
Fabian, A. C.; Pinto, C.; Eckert, D.; Sanders, J. S.; Walker, S. A.; Tamura, T.; Gatuzz, Efrain; Dennerl, K.; ZuHone, J.; Liu, A.; Russell, H.
Germany, United Kingdom, Italy, Switzerland, Japan, United States
Abstract
We present a detailed analysis of the elemental abundances distribution of the Virgo cluster using XMM-Newton observations. We included in the analysis a new EPIC-pn energy scale calibration which allow us to measure velocities with uncertainties down to Δv ~150 km s-1. We investigate the radial distribution of O, Ne, Mg, Si, Ar, S, Ca, Ni, and Fe. We found that the best-fitting model is close to a single-temperature component for distances >80 kpc and the cooler gas is more metal rich. Discontinuities in temperature are found around ~30 and ~90 kpc, which correspond to the radius of the cold fronts. We modelled elemental X/Fe ratio profiles with a linear combination of SNIa and SNcc models. We found a flat radial distribution of SNIa ratio over the total cluster enrichment, which supports an early ICM enrichment scenario, with most of the metals present being produced prior to clustering.