EDP Sciences
Free access
Issue
A&A
Volume 406, Number 2, August I 2003
Page(s) 639 - 644
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030639


A&A 406, 639-644 (2003)
DOI: 10.1051/0004-6361:20030639

The Crab pulsar and its red knot in the near-infrared

J. Sollerman

Stockholm Observatory, AlbaNova, 106 91 Stockholm, Sweden
(Received 28 January 2003 / Accepted 22 April 2003)

Abstract
We present near-infrared observations obtained with ISAAC on the VLT of the Crab pulsar and its environment. Photometry of the pulsar in $J_{\rm s} $, H and  $K_{\rm s} $ shows the pulsar spectrum to extend fairly smoothly from the UV/optical regime. PSF subtraction of the pulsar allows us to study its immediate neighborhood in some detail. In particular, the knot positioned just  $0\farcs6$ from the pulsar has been revealed in the IR. Using also archival HST data for the knot, we have measured its broad band spectrum to rise steeply into the IR, in contrast to the spectrum of the pulsar itself.


Key words: pulsars: individual: PSR B0531+21 -- ISM: supernova remnants -- ISM: individual objects: Crab Nebula

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