Observations and modelling of the hard X-ray emission from GX 1 + 4

Details Observations and modelling of the hard X-ray emission from GX 1 + 4 Observations and modelling of the hard X-ray emission from GX 1 + 4

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260...21g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 1, p. 21-27.

Astronomy and Astrophysics

Astronomy

23

Accretion Disks, Astronomical Models, Emission Spectra, Pulsars, Symbiotic Stars, X Ray Binaries, Balloon-Borne Instruments, Energy Spectra, Neutron Stars, Stellar Magnetic Fields, Stellar Oscillations

Scientific paper

The X-ray pulsar GX 1 + 4 was observed during a balloon flight from Alice Springs, Australia on 1986 November 20. Significant flux was detected over the full energy range of the detector (15-114 keV). The spectrum is very hard with a power-law photon index of 1.85 +/- 0.25. The intensity at 30 keV is (5.1 +/- 0.5) x 10 exp -4/sq cm s keV, a factor of 3 less than typical during the 1970s but orders of magnitude greater than during satellite measurements in 1984 and in early 1987, a few months after the flight. The pulse profiles below 75 keV are very broad and possibly double-peaked. At higher energies there is a remarkable change, with a narrow pulse of phase width 0.1 centered on the phase of the lower energy notch. The observational evidence can be explained within the framework of a model based on two-photon emission as the dominant continuum source. This requires a magnetic field of about 2 x 10 exp 13 G, a value consistent with accretion models in which the system has a retrograde disk.

Affiliated with

Also associated with

No associations

Rating

Observations and modelling of the hard X-ray emission from GX 1 + 4 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 and modelling of the hard X-ray emission from GX 1 + 4, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations and modelling of the hard X-ray emission from GX 1 + 4 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1262922