4U 1626-67 Torque Reversal Simultaneous with Swift/BAT Flux Increase
Abstract
The recent torque reversal in the accretion-powered pulsar 4U 1626-67 (ATel #2095), which occurred after 18 years of steady spin-down, was centered near MJD 54500 (2008 Feb 4) and lasted about 150 days. This was simultaneous with an increase of flux reported by Krimm et al. (ATel #1426). We observed the spin-up first in the Fermi/GBM data (see our web page). Using Swift/BAT observations from 2004 up to the present, we have resolved the frequency history of this source through the torque reversal (Camero-Arranz et al.
- Publication:
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The Astronomer's Telegram
- Pub Date:
- June 2009
- Bibcode:
- 2009ATel.2099....1C
- Keywords:
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- X-ray;
- Gamma Ray;
- Binaries;
- Neutron Stars;
- Pulsars