Diffuse Thermal Emission from Very Hot Gas in Starburst Galaxies: Spectral Results
M. Cappi, M. Persic, S. Mariani, L. Bassani, L. Danese, A. J. Dean, G. Di Cocco, A. Franceschini, L. K. Hunt, F. Matteucci, E. Palazzi, G. G. C. Palumbo, Y. Rephaeli, P. Salucci, A. Spizzichino
Abstract
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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