Excess gamma-rays in the direction of the rho Ophiuchi cloud: an exotic object?

Details Excess gamma-rays in the direction of the rho Ophiuchi cloud: an exotic object? Excess gamma-rays in the direction of the rho Ophiuchi cloud: an exotic object?

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..197m&link_type=abstract

In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 197-200 (SEE N85-33902 22-93)

Computer Science

Cosmic Rays, Electron Clouds, Gamma Rays, Gases, Stellar Winds, Carbon Monoxide, Radiation Sources, Radiation Spectra, Spatial Distribution, Stellar Radiation, X Ray Spectra

Scientific paper

The COS-B X-ray data in the direction of the rho Oph dark cloud show an extended structure; at the same time, the region of highest intensity has a spatial distribution compatible with a localized source; 2CG353+16 which is designated Oph gamma. The possibility of an excess gamma ray flux over what is expected on the basis of the interaction of average density cosmic rays with an estimated cloud mass of 2 to 4 000 M is still open, pending an extended CO survey matching the gamma ray data. Estimates for this excess factor are in the range 2 to 4. While the cloud mass may be underestimated, it should be noted that an excess of the same order appears to be present in the nearby Oph-Sag area, well surveyed in CO with the Columbia dish. Possible reasons for a gamma ray excess, in view of two recent observational developments: an Einstein X-ray survey and a VLA radio survey, both covering the approx 2 deg diameter Oph gamma error box. Current interpretations link the gamma ray excess to the cloud gas, in which some active agent is present: stellar winds, or interaction with the North Polar Spur.

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