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Excess gamma-rays in the direction of the rho Ophiuchi cloud: An exotic object?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.
Document ID
19850025645
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Montmerle, T.
(Commissariat a l'Energie Atomique Saclay, France)
Andre, P.
(Commissariat a l'Energie Atomique Saclay, France)
Feigelson, E. D.
(Pennsylvania State Univ. University Park, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1985
Publication Information
Publication: 19th Intern. Cosmic Ray Conf - Vol. 1
Subject Category
Space Radiation
Report/Patent Number
OG-2.5-1
Report Number: OG-2.5-1
Accession Number
85N33958
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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