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Gamma-ray observations of the interstellar clouds in cepheus
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Digel, S. Thaddeus, Patrick |
| Copyright Year | 1998 |
| Description | During the last six months of the period of performance, the diffuse gamma-ray emission from the Monoceros region was reanalyzed and one of the important conclusions was revised as a result. The reanalysis incorporated newly-available data from recent EGRET viewing periods and revealed a previously-uncataloged gamma-ray point source near the plane in Monoceros. The effect of incorporating this source in the diffuse emission model was significant, as its flux was comparable to that from a large interstellar cloud complex in the Perseus arm. In the updated model, a greatly reduced gamma-ray emissivity was found in the Perseus arm. This finding alters the previous conclusion that we had found evidence for an enhanced emissivity in the arm, which had supported the hypothesis that cosmic rays are coupled to the interstellar medium on the scale of spiral arms. Our updated findings are consistent with our previous results for the emissivity toward the Cepheus region (Digel et al. 1996), where a monotonic gradient of emissivity in the outer Galaxy was found. The updated analysis of Monoceros was presented at the June, 1998 meeting of the American Astronomical Society, and a journal publication should be ready for submission soon. |
| File Size | 458882 |
| Page Count | 6 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19980237336 |
| Archival Resource Key | ark:/13960/t25b5203h |
| Language | English |
| Publisher Date | 1998-09-17 |
| Access Restriction | Open |
| Subject Keyword | Space Radiation Gamma Rays Point Sources Hypotheses Emissivity Gamma Ray Telescopes Molecular Clouds Gamma Ray Observatory Astronomy Interstellar Matter Cosmic Rays Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
