Proper Motion Measurements of Pulsar B1951+32 in the Supernova Remnant CTB 80

Details Proper Motion Measurements of Pulsar B1951+32 in the Supernova Remnant CTB 80 Proper Motion Measurements of Pulsar B1951+32 in the Supernova Remnant CTB 80

2002-02-03

arxiv.org/abs/astro-ph/0202063v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 embedded EPS figures. Accepted to ApJ Letters

Scientific paper

10.1086/340002

Using the Very Large Array and the Pie Town antenna, we have measured the position of the radio pulsar B1951+32 relative to nearby background radio sources at four epochs between 1989 and 2000. These data show a clear motion for the pulsar of (25 +/- 4) milliarcsec/yr at a position angle (252 +/- 7) degrees (north through east), corresponding to a transverse velocity (240 +/- 40) km/s for a distance to the source of 2 kpc. The measured direction of motion confirms that the pulsar is moving away from the center of its associated supernova remnant, the first time that such a result has been demonstrated. Independent of assumptions made about the pulsar birth-place, we show that the measured proper motion implies an age for the pulsar of (64 +/- 18) kyr, somewhat less than its characteristic age of 107 kyr. This discrepancy can be explained if the initial spin period of the pulsar was (27 +/- 6) ms.

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