Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-11
Astronomy and Astrophysics
Astrophysics
8 pages, 4 figures, to appear in PASJ (Suzaku 3rd special issue)
Scientific paper
Although about 40% of the soft X-ray background emission in 0.4 to 1 keV range has extragalactic origins and thus is totally blocked by the Galactic absorption in midplane directions, it decreases at most by about 20 % in midplane. Suzaku observation of the direction, (l, b) = (235, 0), showed an OVII Kalpha emission intensity comparable with that of the MBM-12 on cloud Suzaku observation, but revealed a narrow bump peaked at ~ 0.9 keV. The latter component is partly filling the decrease of the extragalactic component in midplane. The feature can be well represented by a thin thermal emission with a temperature of about 0.8 keV. Because of the high pressure implied for spatially extended hot gas, the emission is likely a sum of unresolved faint sources. We consider a large fraction of the emission originates from faint dM stars. We constructed a model spectrum for spatially unresolved dM stars that consistently explains the observed spectrum and the surface brightness. The model also suggests that the emission from dM stars decreases very rapidly with increasing b, and thus that it cannot compensate entirely the decrease of the extragalactic component at b ~ 2 - 10 deg.
Kimura Sachie
Masui Kensuke
McCammon Dan
Mitsuda Kazu
Takei Yoh
No associations
LandOfFree
The Nature of Unresolved Soft X-ray Emission from the Galactic Disk does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Nature of Unresolved Soft X-ray Emission from the Galactic Disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Nature of Unresolved Soft X-ray Emission from the Galactic Disk will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-449504