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