Measurement of the VELA pulsar's proper motion and detection of the optical counterpart of its compact X-ray nebula

Details Measurement of the VELA pulsar's proper motion and detection of the optical counterpart of its compact X-ray nebula Measurement of the VELA pulsar's proper motion and detection of the optical counterpart of its compact X-ray nebula

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989stin...8929288o&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Astrometry, Astronomical Photometry, Pulsars, Supernova Remnants, X Ray Sources, Exosat Satellite, Heao 2, Nebulae, Satellite Imagery, Stellar Rotation

Scientific paper

The results of optical astrometry and photometry in the Vela pulsar field are reported. The proper motion of the pulsar and the optical counterpart of the approximately 2 minutes diameter compact nebula seen in X-rays, are investigated. The relative position measurements are fitted with previous published data yield of mu (alfa) = -0.026 (+ or -) 0.006 (1 sigma) seconds/year and mu (delta) = 0.028 (+ or -) 0.006 (1 sigma) seconds/year as the proper motion of the pulsar. The implied transverse velocity of the pulsar at an assumed distance of 500 parsec is approximately 90 (+ or -) 15 km/s, in the northwest direction. After a star detection algorithm is used to detect and subtract the stellar contribution, a diffuse nebula centered around the pulsar is clearly distinguishable in the V and B band exposures; several whisp-like structures can be recognized in the images. The optical size of the compact nebula, 2 to 6 x 10(17) cm, is comparable to that in X-rays, and the optical intensity can be connected to the X-ray points by a power-law type emission with photon number index gamma approximately 2. With this spectrum, the total luminosity of the compact nebula extending from optical to X-rays is about 10(33) power erg/s. Possible origins of this compact nebula are discussed.

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