Discovery of a 220 Second X-Ray Pulsar, AX J1749.2-2725

Details Discovery of a 220 Second X-Ray Pulsar, AX J1749.2-2725 Discovery of a 220 Second X-Ray Pulsar, AX J1749.2-2725

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...508..854t&link_type=abstract

The Astrophysical Journal, Volume 508, Issue 2, pp. 854-858.

Astronomy and Astrophysics

Astronomy

21

Stars: Pulsars: General, Stars: Pulsars: Individual: Alphanumeric: Ax J1749.5-27256, X-Rays: Stars

Scientific paper

We report here the discovery of a faint 220 s X-ray pulsar, AX J1749.2-2725, with ASCA. In the analysis, we used a method that can detect a pulsating source in a field of view contaminated by stray light. The source was observed on four occasions between 1995 March and 1997 September. The observed source flux was ~3.0 x 10^-11 ergs s^-1 cm^-2 (2-10 keV) in 1995 March and became an order of magnitude fainter during the 2.5 yr interval. We cannot rule out the possibility that AX J1749.2-2725 is a nearby (d <~ 1.3 kpc) DQ Her-type white dwarf binary, while the hard X-ray spectrum and the transient behavior suggest that it is a distant (d ~ 8.5 kpc) binary system containing a neutron star.

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