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26 April 2024 |
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On the Correlation of Torque and Luminosity in GX 1+4 | | Deepto Chakrabarty
; Lars Bildsten
; Mark H. Finger
; John M. Grunsfeld
; Danny T. Koh
; Robert W. Nelson
; Thomas A. Prince
; Brian A. Vaughan
; Robert B. Wilson
; | | Date: |
7 Mar 1997 | | Journal: | ApJ 481 (1997) L101 | | Subject: | astro-ph | | Abstract: | Over five years of daily hard X-ray (>20 keV) monitoring of the 2-min accretion-powered pulsar GX 1+4 with the Compton Gamma Ray Observatory/BATSE large-area detectors has found nearly continuous rapid spin-down, interrupted by a bright 200-d spin-up episode. During spin-down, the torque becomes more negative as the luminosity increases (assuming that the 20-60 keV pulsed flux traces bolometric luminosity), the opposite of what is predicted by standard accretion torque theory. No changes in the shape of the 20-100 keV pulsed energy spectrum were detected, so that a very drastic change in the spectrum below 20 keV or the pulsed fraction would be required to make the 20-60 keV pulsed flux a poor luminosity tracer. These are the first observations which flatly contradict standard magnetic disk accretion theory, and they may have important implications for understanding the spin evolution of X-ray binaries, cataclysmic variables, and protostars. We briefly discuss the possibility that GX 1+4 may be accreting from a retrograde disk during spin-down, as previously suggested. | | Source: | arXiv, astro-ph/9703047 | | Services: | Forum | Review | PDF | Favorites | |
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