期刊
ASTROPHYSICAL JOURNAL
卷 712, 期 1, 页码 596-603出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/712/1/596
关键词
ISM: individual objects (MSC 319.9-0.7); pulsars: individual (PSR J1509-5850); radio continuum: ISM; stars: neutron; stars: winds, outflows
资金
- Commonwealth of Australia
- Australian Research Council [FF0561298]
- Australian Research Council [FF0561298] Funding Source: Australian Research Council
We report radio polarization observations of G319.9-0.7 (MSC319.9-0.7) at 3 and 6 cm obtained with the Australia Telescope Compact Array. The source shows a highly elongated morphology with the energetic pulsar J1509-5850 located at the tip. We found a flat radio spectrum of index alpha = -0.26 +/- 0.04 and a high degree of linear polarization. These results confirm G319.9-0.7 as a bow-shock pulsar wind nebula. The polarization maps suggest a helical magnetic field trailing the pulsar, with the symmetry axis parallel to the system's inferred direction of motion. This is the first time such a field geometry has been seen in a bow-shock nebula, and it may be the result of an alignment between the pulsar spin axis and its space velocity. Compared to other bow-shock examples, G319.9-0.7 exhibits very different properties in the field structure and surface brightness distribution, illustrating the large diversity of the population.
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