Other
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.4205h&link_type=abstract
American Astronomical Society, HEAD meeting #12, #42.05
Other
Scientific paper
The X-ray timing of accretion-powered millisecond pulsars (AMSPs) over multiple outbursts has revealed that many of these sources are spinning down during X-ray quiescence. The implied spin-down luminosities and observed optical and IR properties during quiescence suggest that these objects may turn on as spin-powered millisecond pulsars when not accreting. If so, much of their spin-down luminosity should be emitted in broad gamma-ray pulses.
We are currently conducting targeted pulsation searches for four AMSPs using the Fermi LAT data. These sources have had multiple outbursts observed by RXTE, allowing us to interpolate approximate pulse ephemerides from the X-ray timing data. Our searches have not yet detected significant pulsations. We present upper limits on the efficiency with which their spin-down luminosities are converted into gamma-ray emission, and we discuss the implications for the presence of other spin-down mechanisms, such as gravitational wave emission.
Hartman J. M. J.
Krauss Miriam I.
Ray Paul Shelton
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