Astrophys. J., 706, 1316-1322 (2009/December-1)
A proper motion for the pulsar wind nebula G359.23-0.82, the "Mouse," associated with the energetic radio pulsar J1747-2958.
HALES C.A., GAENSLER B.M., CHATTERJEE S., VAN DER SWALUW E. and CAMILO F.
Abstract (from CDS):
The "Mouse" (PWN G359.23-0.82) is a spectacular bow shock pulsar wind nebula, powered by the radio pulsar J1747-2958. The pulsar and its nebula are presumed to have a high space velocity, but their proper motions have not been directly measured. Here we present 8.5 GHz interferometric observations of the Mouse nebula with the Very Large Array, spanning a time baseline of 12 years. We measure eastward proper motion for PWN G359.23-0.82 (and hence indirectly for PSR J1747-2958) of 12.9±1.8 mas/yr, which at an assumed distance of 5 kpc corresponds to a transverse space velocity of 306±43 km/s. Considering pressure balance at the apex of the bow shock, we calculate an in situ hydrogen number density of approximately 1.0+0.4–0.2/cm3 for the interstellar medium through which the system is traveling. A lower age limit for PSR J1747-2958 of 163+28–20 kyr is calculated by considering its potential birth site. The large discrepancy with the pulsar's spin-down age of 25 kyr is possibly explained by surface dipole magnetic field growth on a timescale ~15 kyr, suggesting possible future evolution of PSR J1747-2958 to a different class of neutron star. We also argue that the adjacent supernova remnant G359.1-0.5 is not physically associated with the Mouse system but is rather an unrelated object along the line of sight.
ISM: individual (G359.1-0.5, G359.23-0.82) - pulsars: individual: PSR J1747-2958 - stars: neutron - supernova remnants
PSR J1747-1958 is a misprint for PSR J1747-2958.
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