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Asca observation of an "x-ray shadow" in the galactic plane
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Park, Sangwook Ebisawa, Ken |
| Copyright Year | 2001 |
| Description | The diffuse X-ray background (DXB) emission near the Galactic plane (l,b approximately 25.6 degrees, 0.78 degrees) has been observed with ASCA (Advanced Satellite for Cosmology and Astrophysics). The observed region is toward a Galactic molecular cloud which was recently reported to cast a deep X-ray shadow in the 0.5 - 2.0 keV band DXB. The selection of this particular region is intended to provide a constraint on the spatial distribution of the DXB emission along the line of sight: i.e., the molecular cloud is optically thick at <2 keV and so the bulk of the observed soft X-rays must originate in the foreground of the cloud, which is at approximately 3 kpc from the Sun. In the 0.8 - 9.0 keV band, the observed spectrum is primarily from multiple components of thermal plasmas. We here report a detection of soft X-ray (0.5 - 2 keV) emission from an approximately 10(exp 7) K thermal plasma. Comparisons with the ROSAT (Roentgen Satellite) data suggest that this soft X-ray emission is absorbed by N(sub H) = 1 - 3 x 10(exp 21) cm(exp -2), which implies a path-length through the soft X-ray emitting regions of approximately less than 1 kpc from the Sun. |
| File Size | 52749 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20010097343 |
| Archival Resource Key | ark:/13960/t2w42q34h |
| Language | English |
| Publisher Date | 2001-01-22 |
| Access Restriction | Open |
| Subject Keyword | Space Radiation Shadows Rosat Mission X Rays Spatial Distribution Molecular Clouds Radiation Thermal Plasmas Spectral Emission Diffuse Radiation Background Radiation Interstellar Matter Galactic Radiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
