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

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342l..83o&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 342, July 15, 1989, p. L83-L86.

Astronomy and Astrophysics

Astrophysics

40

Nebulae, Pulsars, Stellar Motions, Stellar Spectrophotometry, X Ray Sources, Charge Coupled Devices, Emission Spectra, Optical Countermeasures, Supernova Remnants

Scientific paper

Optical astronometry and photometry in the Vela pulsar field is presented, investigating the proper motion of the pulsar and the optical counterpart of the 2-arcmin-diameter compact nebula seen in X-rays. Fitting the relative position measurements together with previously published data yields mu(alpha) = 26 + or - 6 marcsec (1sigma) and mu(delta) = 28 + or - 6 marcsec/yr (1 sigma) as the proper motion of the pulsar. 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 exposures; several wisplike structures can be recognized in the images. The optical size of the compact nebula, 2-6 x 10 to the 17th 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 = about 2.

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