Computer Science
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.339..603k&link_type=abstract
Nature (ISSN 0028-0836), vol. 339, June 22, 1989, p. 603-605.
Computer Science
153
Galactic Nuclei, Galactic Radiation, Iron, Milky Way Galaxy, Novae, Supernovae, Explosions, Heating, High Temperature Plasmas, Interstellar Matter, X Ray Spectra
Scientific paper
The discovery of intense iron-line emission of 6.7 keV from the Galactic Center, detected by the Ginga satellite, with characteristics consistent with its production by a shock-heated plasma, is reported. The line intensity peaks at the Galactic Center with a surface brightness of about 1.5 x 10 to the -7th erg/s/sr/sq cm and extends over an angular size of 1.8 deg. The total luminosity of the iron line at the center region is about 2.1 x 10 to the 36th erg/s assuming that the distance to the center is 10 kpc. The line intensity at the center is about 10 times larger than that from the region of the Galactic ridge. The line feature observed is consistent with thermal emission from a thin hot plasma at a temperature of about 10 keV. The abundance of iron is estimated to be comparable to or larger than the cosmic abundance. This thin hot plasma is attributable to a shock-heated interstellar medium by an energetic explosion.
Awaki Hisamitsu
Koyama Katsuji
Kunieda Hideyo
Takano Shiro
Tawara Yuzura
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