BeppoSAX observations of the X-ray binary pulsar GX 1+4

Details BeppoSAX observations of the X-ray binary pulsar GX 1+4 BeppoSAX observations of the X-ray binary pulsar GX 1+4

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..797..593n&link_type=abstract

INTERACTING BINARIES: Accretion, Evolution, and Outcomes. AIP Conference Proceedings, Volume 797, pp. 593-598 (2005).

Astronomy and Astrophysics

Astronomy

1

X-Ray Binary Stars, Pulsars, X-Ray Sources (Astronomical), X-Ray Binaries, Pulsars, X-Ray

Scientific paper

We present here the timing and spectral properties of BeppoSAX observations of the binary X-ray pulsar GX 1+4 carried out in August 1996, March 1997, and August 2000. In the middle of the August 2000 observation, the source was in a rare low intensity state that lasted for about 30 hours. Though the source does not show pulsations in the soft X-ray band (1.0-5.5 keV) during the extended low state, pulsations are detected in 5.5-10.0 keV energy band of the MECS detector and in hard X-ray energy bands (15-150 keV) of the PDS instrument. Broad-band (1.0-150 keV) pulse averaged spectroscopy reveals that the best-fit model comprises of a Comptonized continuum along with an iron Kα emission line. A strong iron Kβ emission line is detected for the first time in GX 1+4 during the extended low state of 2000 observation. The optical depth and temperature of the Comptonizing plasma are found to be identical during the high and low intensity states whereas the hydrogen column density and the temperature of the seed photons are higher during the low state.

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