Physics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.2915s&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #29.15; Bulletin of the American Astronomical Society, Vol. 26, p.904
Physics
Scientific paper
A region of almost 300 deg(2) in Ursa Major around the direction of the lowest neutral hydrogen column density in the sky has been surveyed in the (1)/(4) keV X-ray band ( ~ 0.12-0.284 keV at 10% of the peak response) using the ROSAT PSPC, and has been fully mapped in the 21 cm line of neutral hydrogen with an angular resolution of 21' or better. We present maps of these two data sets and an analysis of the spatial correlation between them. Over the entire field, the (1)/(4) keV band X-ray count rate shows a strong negative correlation with the column density of Galactic neutral hydrogen. We discuss the local, extragalactic, and halo contributions to the observed diffuse X-ray intensity, and derive an upper limit to the Galactic X-ray emission originating beyond this HI distribution that is a factor of ~ 7 smaller than the inferred flux from beyond the Draco Nebula, an apparent halo object located ~ 41deg away. This implies that while there may be significant amounts of hot gas in the galactic halo, its properties must vary strongly across the sky. This research was supported in part by the National Aeronautics and Space Administration under grants NAG5-679, NAG5-1726, and NAG5-1817 and by the Max Planck Institute for Extraterrestrial Physics.
Hasinger Guenter
Jahoda Keith
Lockman Felix J.
McCammon Dan
Sanders Wilton T.
No associations
LandOfFree
Soft X-ray and HI Surveys of the Low NH Region in Ursa Major 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 Soft X-ray and HI Surveys of the Low NH Region in Ursa Major, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Soft X-ray and HI Surveys of the Low NH Region in Ursa Major will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-882395