Observations of CYG X-1 from Aryabhata

Details Observations of CYG X-1 from Aryabhata Observations of CYG X-1 from Aryabhata

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.260..307r&link_type=abstract

Nature, vol. 260, Mar. 25, 1976, p. 307, 308. Research supported by the Department of Space of India.

Astronomy and Astrophysics

Astronomy

3

Spaceborne Astronomy, Stellar Spectrophotometry, X Ray Stars, Indian Space Program, Photon Density, Proportional Counters, Satellite-Borne Instruments, Stellar Spectra, X Ray Astronomy

Scientific paper

The paper reports results of observations of the X-ray source Cyg X-1 by the Indian satellite Aryabhata on April 19, 1975. The observations of the source were made by proportional counter telescopes in the energy range 2.5 to 18.75 keV just before the source made a major increase in its intensity. The spectrum of Cyg X-1 thus detected shows a power law dependence with an index of about 0.7 plus or minus 0.2 in the energy interval 2.5-13.8 keV, the estimated intensity being 0.84 plus or minus 0.3 photons/sq. cm/s. The source underwent a major upward transition in its intensity during late April. This intensity transition is characterized by an accompanying spectral change with spectral exponent changing from the value of 1.6 during the normal state to 2.2 in the 'high' state.

Affiliated with

Also associated with

No associations

Rating

Observations of CYG X-1 from Aryabhata does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Observations of CYG X-1 from Aryabhata, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of CYG X-1 from Aryabhata will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1220735