Kavli Affiliate: Roger W. Romani
| First 5 Authors: D. Kandel, Roger W. Romani, Hongjun An, ,
| Summary:
In a multi-orbit (100 ks) $mathrm{it XMM-Newton}$ exposure of the original
black widow pulsar, PSR J1959+2048, we measure the strong orbital modulation
caused by intrabinary shock (IBS) emission. The IBS light curve peak appears
asymmetric, which we attribute to sweep-back effects in the companion wind. We
also see evidence for an X-ray eclipse by the companion and its wind. Together
with the IBS fit, this supports an edge-on $isim 90^circ$ view of the system
and a modest $sim 1.8M_odot$ mass for the recycled pulsar. Our IBS fit
parameters imply a wind flux that, if persistent, would evaporated the
companion within a few Gyr.
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