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. = 17(h)44(m)33.(s)09, decl. = -28degrees44'27."0 (J2000.0; with a 1 sigma error of`similar to0".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) x 10(33) 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.
| Original language | English |
|---|---|
| Pages (from-to) | pp.L93-L96. |
| Number of pages | 4 |
| Journal | Astrophysical Journal |
| Volume | 568 |
| Issue number | 2 |
| Publication status | Published - 1 Apr 2002 |
Keywords
- pulsars : individual (GRO J1744-28)
- stars : neutron
- X-rays : stars
- X-RAY TRANSIENTS
- ASCA OBSERVATIONS
- RAPID BURSTER
- LUMINOSITY
- PULSATIONS
- OUTBURST