A Carbon Atmosphere for the Cassiopeia A Neutron Star

Details A Carbon Atmosphere for the Cassiopeia A Neutron Star A Carbon Atmosphere for the Cassiopeia A Neutron Star

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..40h&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Computer Science

Compact Objects

Scientific paper

The nature of the central compact objects in supernova remnants, showing thermal spectra but no radio pulsations, is a major mystery of the Chandra era. The youngest known CCO in Cassiopeia A is perhaps the most mysterious, as spectral fits with single-component models have given emitting areas too small for neutron star radii, while a hot spot should produce pulsations that have not yet been detected. We have produced a variety of light-element atmosphere models for neutron stars, and found that only unmagnetized carbon atmospheres provide both acceptable fits to the Cas A CCO spectrum (T˜1.5e6 K, R˜12 km) and radius constraints consistent with modern NS models. Our result has ramifications for the evolution of NS surfaces, NS thermal evolution, and constraints on NS interior structure.

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