Multicolor Photometry of the Vela Pulsar

Details Multicolor Photometry of the Vela Pulsar Multicolor Photometry of the Vela Pulsar

2001-07-02

arxiv.org/abs/astro-ph/0107027v1

Astron.Astrophys. 376 (2001) 213-216

Astronomy and Astrophysics

Astrophysics

4 pages, LaTex, 2 Postscript figures. Astronomy & Astrophysics, accepted

Scientific paper

10.1051/0004-6361:20010951

Multicolor 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.

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