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arxiv: astro-ph/9809325 · v1 · submitted 1998-09-25 · 🌌 astro-ph

Diffuse Thermal Emission from Very Hot Gas in Starburst Galaxies: Spectral Results

M.Cappi (ITeSRE-CNR , Bologna) , M.Persic (Trieste Astronomical Observatory) , S.Mariani (Univ. of Bologna) , L.Bassani , L.Danese , A.J.Dean , G.Di Cocco
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A.Franceschini L.K.Hunt F.Matteucci E.Palazzi G.G.C.Palumbo Y.Rephaeli P.Salucci A.Spizzichino
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classification 🌌 astro-ph
keywords emissiongalaxiescomponentstarburstthermalarchetypicalbepposaxbriefly
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New BeppoSAX observations of the nearby archetypical starburst galaxies (SBGs) NGC253 and M82 are presented. The main observational result is the unambiguous evidence that the hard (2-10 keV) component is (mostly) produced in both galaxies by thermal emission from a metal-poor (~ 0.1-0.3 solar), hot (kT \~ 6- 9 keV) and extended (see companion paper: Cappi et al. 1998) plasma. Possible origins of this newly discovered component are briefly discussed. A remarkable similarity with the (Milky Way) Galactic Ridge's X-ray emission suggests, nevertheless, a common physical mechanism.

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