Circinus X-1: A Neutron Star Doing Its Best Impression Of A Black Hole?

Type Conference Paper
Names Sebastian Heinz, P. Sell, N. Schulz, N. Brandt, D. Calvelo, P. Jonker
Proceedings Title Bulletin of the American Astronomical Society
Conference Name American Astronomical Society, HEAD Meeting #12, #42.03
Volume 12
Date September 1, 2011
Short Title Circinus X-1
Library Catalog NASA ADS
Abstract The X-ray binary Circinus X-1 is a trailblazer in many ways: (a) It is one of only two neutron star X-ray binaries with a resolved radio jet, making it a prototype and defining member of the class of neutron star microquasars. (b) It is one of only two microquasars with well established large scale, diffuse radio lobes. (c) Its jet has been clocked at a Lorentz factor of Gamma=16, potentially making it the fastest microquasar to date. (d) Finally, Circinus X-1 has become the first and only neutron star XRB with a resolved X-ray jet: Recent Chandra and radio observations show the source in glorious detail, revealing parsec scale shocks and arcsecon scale extended X-ray emission. I will discuss the constraints we can put on the jet power from this neutron star and their implications for our understanding of relativistic jets from compact objects as a whole.
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