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Title:
Star-Burst Galaxy M83 Observed from ASCA
Authors:
Okada, Kyoko; Mitsuda, Kazuhisa; Dotani, Tadayasu
Affiliation:
AA(The Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229; (KO):)
Publication:
Publ. of the Astronomical Society of Japan, v.49, p.653-658. (PASJ Homepage)
Publication Date:
12/1997
Origin:
PASJ
PASJ Keywords:
GALAXIES: INDIVIDUAL (M83), GALAXIES: SPIRAL, GALAXIES: STAR-BURST, GALAXIES: X-RAYS, X-RAYS: SPECTRA
Bibliographic Code:
1997PASJ...49..653O

Abstract

Combined spectral and spatial analyses of the central region of the nearby spiral galaxy M83 shows the presence of two different emission components. One component has a spatial size of 2.7', as defined by the rms radius of the emission region, and has an emission temperature of about 5 keV when it is approximated with a thermal-bremsstrahlung model. The other component has a much smaller radius with an upper limit of 1.0' rms radius, and has a lower emission temperature of about 0.4 keV. The X-ray luminosities of the two components are, respectively, 2.1times 10(39) erg s(-1) (soft component) and 4.8 times 10(39) erg s(-1) (hard component) in the 0.5--10 keV band (for the distance of 3.75 Mpc). The soft, lower-temperature component is consistent to be emission from the hot gas originating from the star-burst activity in the galaxy. On the other hand, the hard component is consistent with being a collection of binary X-ray sources in the bulge region.

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