Fast as Potoroo: Radio Continuum Detection of a Bow-Shock Pulsar Wind Nebula Powered by Pulsar J1638-4713
arxiv(2023)
摘要
We report the discovery of a bow-shock pulsar wind nebula (PWN), named
Potoroo, and the detection of a young pulsar J1638-4713 that powers the nebula.
We present a radio continuum study of the PWN based on 20-cm observations
obtained from the Australian Square Kilometre Array Pathfinder (ASKAP) and
MeerKAT. PSR J1638-4713 was identified using Parkes radio telescope
observations at frequencies above 3 GHz. The pulsar has the second-highest
dispersion measure of all known radio pulsars (1553 pc/cm^3), a spin period of
65.74 ms and a spin-down luminosity of 6.1x10^36 erg/s. The PWN has a cometary
morphology and one of the greatest projected lengths among all the observed
pulsar radio tails, measuring over 21 pc for an assumed distance of 10 kpc. The
remarkably long tail and atypically steep radio spectral index are attributed
to the interplay of a supernova reverse shock and the PWN. The originating
supernova remnant is not known so far. We estimated the pulsar kick velocity to
be in the range of 1000-2000 km/s for ages between 23 and 10 kyr. The X-ray
counterpart found in Chandra data, CXOU J163802.6-471358, shows the same tail
morphology as the radio source but is shorter by a factor of 10. The peak of
the X-ray emission is offset from the peak of the radio total intensity (Stokes
I) emission by approximately 4.7", but coincides well with circularly polarised
(Stokes V) emission. No infrared counterpart was found.
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