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On the Expansion, Age, and Origin of the Puzzling Shell/Pulsar Wind Nebula G310.6-1.6 | Stephen P. Reynolds
; Kazimierz J. Borkowski
; | Date: |
13 Nov 2019 | Abstract: | We present a 142-ks Chandra observation of the enigmatic combination
supernova remnant G310.6-1.6 consisting of a bright pulsar-wind nebula driven
by an energetic pulsar, surrounded by a highly circular, very faint shell with
a featureless, probably synchrotron, spectrum. Comparison with an observation 6
years earlier shows no measurable expansion of the shell, though some features
in the pulsar-wind nebula have moved. We find an expansion age of at least 2500
yr, implying a current shock velocity less than about 1000 km/s. We place
severe upper limits on thermal emission from the shell; if the shell locates
the blast wave, a Sedov interpretation would require the remnant to be very
young, about 1000 yr, and to have resulted from a dramatically sub-energetic
supernova, ejecting << 0.02 M_sun with energy E < 3 x 10^47 erg. Even a
merger-induced collapse of a white dwarf to a neutron star, with a low-energy
explosion, is unlikely to produce such an event. Other explanations seem
equally unlikely. | Source: | arXiv, 1911.5792 | Services: | Forum | Review | PDF | Favorites |
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