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Luminosity dependent changes of pulse profiles in the X-ray binary GX 1+4

journal contribution
posted on 2023-05-16, 11:07 authored by Greenhill, JG, Galloway, D, Storey, MC
We have reviewed the X-ray pulse profiles from a large number of observations of the accreting binary pulsar GX 1+4 obtained during the last 25 years. The profiles cover various energy ranges between 1 and 100 keV. Using these data we present a coherent picture of present and past pulse profiles and the variations of these pulse profiles with time. The pulse shape is dependent on both the X-ray luminosity and whether the pulsar is spinning up or down. Profiles measured during the GX 1+4 high state in the 1970s are all trailing edge bright. Subsequently the profiles have generally been symmetric or leading edge bright. Rossi X-ray Timing Explorer (RXTE) satellite data taken in July 1996 show that similar pulse shape variations can occur on a timescale of hours. The implications of this new information for accretion models is discussed.

History

Publication title

Publications Astronomical Society of Australia

Volume

15

Pagination

254-258

ISSN

1323-3580

Department/School

School of Natural Sciences

Publisher

Astronomical Society of Australia

Place of publication

150 Oxford St, Po Box 1139, Collingwood, Australia, Victoria, 3066

Repository Status

  • Restricted

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Expanding knowledge in the physical sciences

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