A rare opportunity to resolve the emission line complex in GRO J1744-28
Abstract
Discovered Dec 1995, GRO J1744-28, AKA "The Bursting Pulsar", is one of only two known objects to exhibit Type-II X-ray bursts. That outburst lasted ~6 months, and since it has remained in quiescence. Recently a coordinated effort by Swift, MAXI and Fermi confirmed GRO J1744-28 to be in its first outburst in ~18 years. With Chandra we entered the era of high resolution X-ray spectra, however Chandra has only observed GRO J1744-28 in quiescence, obtaining a very poor spectrum. ASCA observations (Nishiuchi et al., 1999) detected a 6.7 keV Iron line feature, which is strongly detected in new observations by Swift. However, the poor spectral resolution of ASCA and XRT do not allow us to discern the real nature of this feature. With such high accretion rate, we might expect that the line complex is a blend of neutral and high ionized lines from disk wind. Only Chandra HETG observations have the sufficient resolution to pin down the nature of the X-ray emission lines in GRO J1744-28.
- Publication:
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Chandra Proposal
- Pub Date:
- September 2013
- Bibcode:
- 2013cxo..prop.4310K