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

Citation

Greenhill, JG and Galloway, D and Storey, MC, Luminosity dependent changes of pulse profiles in the X-ray binary GX 1+4, Publications Astronomical Society of Australia, 15, (2) pp. 254-258. ISSN 1323-3580 (1998) [Refereed Article]

DOI: doi:10.1071/AS98254

Abstract

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.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Greenhill, JG (Dr John Greenhill)
Author:Galloway, D (Mr Duncan Galloway)
ID Code:13628
Year Published:1998
Web of Science® Times Cited:5
Deposited By:Physics
Deposited On:1998-08-01
Last Modified:2011-08-08
Downloads:0

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