Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365..180o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 180-185.
Astronomy and Astrophysics
Astronomy
29
Astronomical Spectroscopy, Ginga Satellite, Spaceborne Astronomy, Starburst Galaxies, X Ray Astronomy, X Ray Spectroscopy, Bremsstrahlung, Brightness Temperature, Emission Spectra, Iron, Star Formation
Scientific paper
X-ray spectra of two starburst galaxies NGC 253 and M83 in 2-20 keV have been obtained with the X-ray astronomy satellite Ginga. The observed spectra can be described by thermal bremsstrahlung models with temperatures of 6-7 keV for both galaxies, with no significant absorption. The estimated luminosities in 2-10 keV are about 1 x 10 to the 40th ergs/s and about 8 x 10 to the 39th ergs/s for NGC 253 and M83, respectively, consistent with IPC measurements in a lower enrgy band. No significant iron K-emission line was detected from either galaxy with 90 percent upper limit on the equivalent width about 400 eV, suggesting a significant depletion of iron if most of the continuum emission is of thermal origin. The spectral shape and the enhanced X-ray luminosity of these two galaxies, compared with M31 or the Galaxy, suggest that a major fraction of the X-ray emission may originate from hot gas. However, the lack of an iron emission line remains a puzzle.
Koyama Katsuji
Makishima Kazuo.
Ohashi Takuma
Stewart Gordon C.
Takano Shiro
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