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09 February 2025
 
  » arxiv » astro-ph/0107027

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Multicolor Photometry of the Vela Pulsar
R.P.Mignani ; P.A.Caraveo ;
Date 2 Jul 2001
Journal Astron.Astrophys. 376 (2001) 213-216
Subject astro-ph
AffiliationESO, Garching, Germany) and P.A.Caraveo (I stituto di Fisica Cosmica del CNR, Milano, Italy
AbstractMulticolor photometry of the Vela pulsar (PSR B0833-45), updated by recent HST/WFPC2 observations obtained in the 555W, 675W and 814W filters, is presented. The available data provide the best characterization so far of the pulsar spectral shape, which is dominated by a flat power law continuum with spectral index alpha = -0.2 +/- 0.2, consistent with the extrapolation in the optical domain of the power law component of the X-ray spectrum detected by Chandra. In addition, a marginally significant dip (~ 3 sigma) seems to be present at about 6500 AA. Spectroscopic observations with the VLT, now in progress, will undoubtly provide a much better assessment of the reality and characteristics of this feature.
Source arXiv, astro-ph/0107027
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