A Chandra Observation of GRO J1744-28: The Bursting Pulsar in Quiescence
Abstract
We present a Chandra/Advanced CCD Imaging Spectrometer I-array observation of GRO J1744-28. We detected a source at a position of R.A.=17h44m33.09s. decl.=-28deg44'27.0" (J2000.0; with a 1 σ error of ~0.8"), consistent with both ROSAT and interplanetary network localizations of GRO J1744-28 when it was in outburst. This makes it likely that we have detected the quiescent X-ray counterpart of GRO J1744-28. Our Chandra position demonstrates that the previously proposed infrared counterpart is not related to GRO J1744-28. The 0.5-10 keV luminosity of the source is (2-4)×1033 ergs s-1 (assuming the source is near the Galactic center at a distance of 8 kpc). We discuss our results in the context of the quiescent X-ray emission of pulsating and nonpulsating neutron star X-ray transients.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 2002
- DOI:
- 10.1086/340332
- arXiv:
- arXiv:astro-ph/0201293
- Bibcode:
- 2002ApJ...568L..93W
- Keywords:
-
- Stars: Pulsars: Individual: Alphanumeric: GRO J1744-28;
- Stars: Neutron;
- X-Rays: Stars;
- Astrophysics
- E-Print:
- Accepted for publication in ApJ Letters, 20 February 2002