Suzaku Metal Abundance Patterns in the Outflow Region of M82 and the Importance of Charge Exchange

Abstract

We performed spectral analysis of Suzaku data of the galactic disk and outflow regions of the starburst galaxy M82. Thermal modeling of the central disk regions requires at least three temperature components. The Ly$\beta$ line fluxes of O VIII and Ne X exceed those expected from a plasma in collisional ionization equilibrium. The ratios of Ly$\beta$/Ly$\alpha$ lines for O VIII and Ne X are higher than those of collisional ionization equilibrium, which may be caused by the process of charge exchange. In the outflow wind region, the spectra are well reproduced with two-temperature thermal models, and we have derived the metal abundances of O, Ne, Mg, and Fe in the outflow. The ratios of O/Fe, Ne/Fe, and Mg/Fe are about 2, 3, and 2, respectively, relative to the solar value determined by Lodders (2003). Since there is no evidence of charge exchange in outflow region, the metal abundances should be more reliable than those in the central region. This abundance pattern indicates that starburst activity enriches the outflow through SN II metal ejection into intergalactic space.

14 pages, 9 figures, accepted for publication in PASJ

References in corpus (8)

• Iron line and diffuse hard X-ray emission from the starburst galaxy M82
• Charge-Transfer induced EUV and Soft X-ray emissions in the Heliosphere
• A deep X-ray observation of M82 with XMM-Newton
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• A new superwind galaxy: XMM-Newton observations of NGC 6810
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• Chandra Survey of Nearby Highly Inclined Disc Galaxies - II: Correlation Analysis of Galactic Coronal Properties
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• The Cosmic Ultraviolet Baryon Survey (CUBS) -- III. Physical properties and elemental abundances of Lyman limit systems at $z<1$
• Spectral Modeling of the Charge-Exchange X-ray Emission from M82
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• X-ray spectroscopy of galaxy clusters: beyond the CIE modeling
• Spatial Distribution of Abundance Patterns in the Starburst Galaxy NGC 3079 Revealed with Chandra and Suzaku
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• Chandra survey of nearby highly inclined disk galaxies -- V: emission structure and origin of galactic coronae
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• Revisiting the Galactic Winds in M82 II: Development of Multiphase Outflows in Simulations
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