Neutral clouds in a pervasive X-ray gas between the sun and northern HVCs

Details Neutral clouds in a pervasive X-ray gas between the sun and northern HVCs Neutral clouds in a pervasive X-ray gas between the sun and northern HVCs

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13...93m&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)93-(12)101

Astronomy and Astrophysics

Astronomy

1

Astronomical Models, Background Radiation, H I Regions, Interstellar Matter, Nebulae, Shadows, X Ray Absorption, X Ray Astronomy, X Ray Sources, Data Correlation, Infrared Imagery, Proportional Counters, Rosat Mission, X Ray Imagery, X Ray Telescopes

Scientific paper

We present evidence that the soft X-ray distribution observed with the ROSAT Position-Sensitive Proportional Counter (PSPC) instrument is not adequately explained by the standard Local Hot Bubble model. We discuss the X-ray absorbing cloud LVC 88+36-2 embedded in the hot plasma of the Local Hot Bubble, the X-ray shadow of the Draco nebula and other clouds inside and outside the galactic disk, and the X-ray emission associated with halo type objects like the high velocity clouds (HVC's) M I and M II. They populate the distance range from about 60 pc to more than a few kpc and imply the presence of X-ray emitting plasma between the sun and and the outer galactic halo. These observations are consistent with a pervasive X-ray emitting plasma in which neutral clouds are embedded. However, the volume filling factor of this plasma is not known. A model which adequately describes the observed features has been developed and published by Hirth et al. For the first time in the literature we present results of a correlation analysis of X-ray shadows and H I or IR images of a molecular cloud. This is a new technique for the determination of the total column density of hydrogen nuclei for molecular clouds.

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