Resolving The Remarkable Vela Pulsar Wind Nebula In Space And Time With Chandra.

Details Resolving The Remarkable Vela Pulsar Wind Nebula In Space And Time With Chandra. Resolving The Remarkable Vela Pulsar Wind Nebula In Space And Time With Chandra.

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.2009k&link_type=abstract

American Astronomical Society, HEAD meeting #12, #20.09

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Scientific paper

Early Chandra observations of the Vela pulsar wind nebula (PWN) have already revealed its rich and dynamic structure. Here we present the results of eleven 40 ks Chandra ACIS observations taken between July 2009 and September 2010. The animation reveals remarkable dynamics of the Vela pulsar jet which resembles a rotating cork-screw. The jet flow is subject to instabilities that give rise to bright blobs, which brighten and fade on a one week timescale. The overall jet shape remains preserved on the timescale of one-two months, but it can change dramatically on a one year timescale. The inner nebula structure is also highly variable. The bright inner counter-jet appears to be the most variable feature of the inner PWN, both in brightness and shape. There are also brightness enhancements (knots) that appear to move along the inner arc, which is apparently a brightened part of a torus. The very deep combined image shows that the X-ray emission extends as far as the radio emission in the equatorial plane and ahead of the moving pulsar. The PWN spectral map reveals an intricate spectral structure with very hard spectra of the PWN features near the pulsar. We compare the Vela spectral map with those we produced for other PWNe observed by Chandra. We discuss the implications of the resolved structure and variability in context of pulsar wind models.
This work is supported by the by NASA through Chandra grant G09-0084B and by the Ministry of Education and Science of Russian Federation (Contract No. 11.G34.31.0001).

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