CO observations of the Cepheus flare. II. Gamma rays from the interstellar gas and a possible new COS B source

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169102· OSTI ID:6334358

Grenier, I A; Lebrun, F ^[1]

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1. CEA, Service d'Astrophysique, Gif-sur-Yvette (France) Paris VII Universite (France) Paris Observatoire (France) CEA, Service d'Astrophysique, Gif-sur-Yvette (France)

In this paper, a maximum-likelihood analysis is used to compare maps of the H I and (C-12)O interstellar gas in the Cepheus Flare region to COS B gamma-ray data for these clouds. The results imply a value of (2.3 + or - 1.2) x 10 to the 20th mol/sq cm/K/km-s for the N(H2)/W(CO) ratio in the Cepheus molecular complex. The presence of a significant pointlike excess which stands above the diffuse gamma radiation at l = 111 deg, b = 19.8 deg is demonstrated. The excess may correspond to a new, bright, and extremely soft gamma-ray source. 32 refs.

• OSTI ID: 6334358
• Journal Information: Astrophysical Journal; (USA), Journal Name: Astrophysical Journal; (USA) Vol. 360; ISSN ASJOA; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ASTRONOMY
CEPHEIDS
CHEMISTRY
COSMIC GAMMA SOURCES
COSMIC GASES
COSMIC RADIATION
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMOCHEMISTRY
ELECTROMAGNETIC RADIATION
FLUIDS
GAMMA ASTRONOMY
GAMMA RADIATION
GASES
H1 REGIONS
INTERSTELLAR SPACE
IONIZING RADIATIONS
MAXIMUM-LIKELIHOOD FIT
MOLECULES
NUMERICAL SOLUTION
PULSATING VARIABLE STARS
RADIATIONS
SATELLITES
SPACE
STARS
VARIABLE STARS