Hard x-ray observations of Cygnus X-1 with the MISO telescope

Journal Article · Wed Jan 01 00:00:00 EST 1986 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163803· OSTI ID:5612934

Perotti, F; Della Ventura, A; Villa, G; Bassani, L; Butler, R C

The results of hard x-ray, soft gamma-ray observations of the galactic black hole candidate, Cyg X-1, taken with the MISO telescope in October 1979 and May 1980 are presented, confirming the superlow state measured during September-October 1979 by the HEAO 3 satellite. The 1980 observation coincides with a low- to high-state transition and is consistent with HEAO 3 observations taken at the same epoch. No gamma-ray counting-rate excess above 200 keV was recorded in either observation. Apart from these two measurements, the observation of the Crab Nebula as an a posteriori calibration source is also described. 15 references.

• Research Organization: CNR, Istituto di Fisica Cosmica, Milan, Italy; CNR, Istituto di Tecnologie e Studio delle Radiazioni Extraterrestri, Bologna, Italy
• OSTI ID: 5612934
• Journal Information: Astrophys. J.; (United States), Vol. 300
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BLACK HOLES
X-RAY SPECTRA
CRAB NEBULA
ANGULAR DISTRIBUTION
EXPERIMENTAL DATA
COSMIC RADIO SOURCES
DATA
DISTRIBUTION
INFORMATION
NEBULAE
NUMERICAL DATA
SPECTRA
SUPERNOVA REMNANTS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources