X-ray spectroscopy of the hot has in the M31 bulge

Abstract

We present an X-ray spectroscopic study of the nuclear region of the M31 bulge, based on observations of the Xmm-Newton Reflection Grating Spectrometers. The obtained high-resolution grating spectra clearly show individual emission lines of highly-ionized iron and oxygen, which unambiguously confirm the presence of diffuse hot gas in the bulge, as indicated from previous X-ray CCD imaging studies. We model the spectra with detailed Monte-Carlo simulations, which provide a robust spectroscopic estimate of the hot gas temperature $\sim 0.29$ keV and the O/Fe ratio $\sim 0.3$ solar. The results indicate that iron ejecta of type Ia supernovae are partly-mixed with the hot gas. The observed spectra show an intensity excess at the OVII triplet, which most likely represents emission from charge exchanges at the interface between the hot gas and a known cool gas spiral in the same nuclear region.

7 pages, 6 figures, accepted for publication in MNRAS

References in corpus (7)

• A deep X-ray observation of M82 with XMM-Newton
• Unresolved emission and ionized gas in the bulge of M31
• M31* and its circumnuclear environment
• Chandra detection of diffuse hot gas in and around the M31 bulge
• Type-Ia Supernova-driven Galactic Bulge Wind
• Elemental Abundances in the X-Ray Gas of Early-Type Galaxies with XMM and Chandra Observations
• Characterizing the Properties of Clusters of Galaxies as a Function of Luminosity and Redshift

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