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

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

1998-09-25

arxiv.org/abs/astro-ph/9809325v1

Astronomy and Astrophysics

Astrophysics

4 LateX pages, 4 postscript figures and memsait.sty included, to appear in proceedings of ``Dal nano- al tera-eV: tutti i colo

Scientific paper

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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