X-ray emission lines from three Galactic bulge sources

Details X-ray emission lines from three Galactic bulge sources X-ray emission lines from three Galactic bulge sources

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...308..644v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 308, Sept. 15, 1986, p. 644-654.

Astronomy and Astrophysics

Astronomy

19

Astronomical Spectroscopy, Emission Spectra, Galactic Bulge, Globular Clusters, Line Spectra, Milky Way Galaxy, X Ray Binaries, Astronomical Models, Black Body Radiation, Bremsstrahlung, Galactic Structure, Heao 2, Spaceborne Astronomy

Scientific paper

The globular cluster burst source 1820-30 (NGC 6624), the burster Serpens X-1, and the bulge source GX 9+9 were each observed simultaneously with the Einstein objective grating spectrometer and monitor proportional counter. In the high-resolution grating data emission features attributable to highly ionized states of O, N, Fe, and possibly Si and S are present. The relative intensities of these features are rather poorly described by existing models of the X-ray emitting gas in compact systems. All three sources have broad-band X-ray spectra that are well fitted by either of two models: single thermal bremsstrahlung spectra with temperatures of ≡6 - 10 keV, or two-component blackbody spectra with temperatures of 0.5 - 0.7 keV and ≡2.0 keV.

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