Beppo SAX monitoring of the “ anomalous ” X – ray pulsar 4 U 0142 + 61

نویسندگان

  • G. L. Israel
  • T. Oosterbroek
  • L. Angelini
  • S. Campana
  • S. Mereghetti
  • A. N. Parmar
  • A. Segreto
  • L. Stella
  • J. van Paradijs
  • N. E. White
چکیده

The 8.7 s X–ray pulsar 4U 0142+61 was monitored by BeppoSAX between January 1997 and February 1998. This source belongs to the rapidly growing class of " anomalous " X–ray pulsars (AXPs) which have pulse periods in the 6–12 s range and no plausible optical, infrared or radio counterparts. The BeppoSAX periods measurements show that 4U 0142+61 continues its spin–down at a nearly constant rate of ˙ P ∼ 2×10 −12 s s −1. The 0.5– 10 keV pulse shape is double peaked. The phase–averaged spectrum can be described by a steep absorbed power–law (Γ ∼ 4) plus a blackbody with kT ∼ 0.4 keV. 4U 0142+61 was also detected serendipitously in a March 1996 RXTE observation pointed towards the nearby 1455 s X–ray pulsar RX J0146.9+6121. The timing analysis results are reported for this observation and the spin history of 4U 0142+61 since 1979 is discussed.

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SAX monitoring of the “ anomalous ” X - ray pulsar 4 U 0142 + 61

The 8.7 s X-ray pulsar 4U 0142+61 was monitored by BeppoSAX between January 1997 and February 1998. This source belongs to the rapidly growing class of “anomalous” X-ray pulsars (AXPs) which have pulse periods in the 6– 12 s range and no plausible optical, infrared or radio counterparts. The BeppoSAX periods measurements show that 4U 0142+61 continues its spin–down at a nearly constant rate of ...

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تاریخ انتشار 1999