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No Persistent Pulsations in Aquila X-1 as it Fades into Quiescence

Chandler, A. M. and Rutledge, R. E. (2000) No Persistent Pulsations in Aquila X-1 as it Fades into Quiescence. Astrophysical Journal, 545 (2). pp. 1000-1006. ISSN 0004-637X. doi:10.1086/317831.

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We searched for coherent X-ray pulsations from Aql X-1 in a series of RXTE observations taken shortly after a recent outburst. During the course of these observations, Aql X-1 passes through an apparent "propeller" phase as its luminosity fades to its quiescent value. No pulsations were detected, and we place upper limits (ranging from 0.52% to 9.0%) on the fractional rms amplitude of any periodic signal contained in the various data sets searched. This result has implications for the geometry of the system, if the quiescent luminosity is due to continued low-level accretion. Alternatively, our result supports the idea that the quiescent luminosity may be due to thermal emission.

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Additional Information:© 2000. The American Astronomical Society. We thank Stuart B. Anderson and Thomas A. Prince for helpful discussions. We also thank Lars Bildsten, Sergio Campana, and an anonymous referee for valuable comments on the manuscript. This work was supported by NASA grant NAG 5-3239.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:stars: individual (Aquila X-1); stars: neutron; X-rays: stars
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2000-08
Issue or Number:2
Record Number:CaltechAUTHORS:20150219-091844639
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54995
Deposited By: Deborah Miles
Deposited On:24 Feb 2015 03:32
Last Modified:10 Nov 2021 20:40

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