Testing The Cas A Neutron Star Temperature Decline With Other Chandra Instruments

Details Testing The Cas A Neutron Star Temperature Decline With Other Chandra Instruments Testing The Cas A Neutron Star Temperature Decline With Other Chandra Instruments

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922607e&link_type=abstract

American Astronomical Society, AAS Meeting #219, #226.07

Astronomy and Astrophysics

Astronomy

Scientific paper

The neutron star in the Cassiopeia A supernova remnant is 330 years old, making it the youngest neutron star in the Milky Way. Heinke & Ho (2010) reported a rapid cooling drop of 4% in its surface temperature (21% drop in observed flux) from Chandra ACIS-S archival data between 2000 and 2009. This opened the suggestion of enhanced neutrino emission due to a superfluid transition in the core to account for the observed rapid cooling (Page et al. 2011, Shternin et al. 2011). Here we present analysis of archival Chandra ACIS-I, HRC-I and HRC-S data over the same time period to test the rate. We used the best ACIS-S carbon atmosphere spectral fits to infer the countrates corresponding to various temperatures, along with current (CALDB 4.4.6) estimates of the effective area and its changes over time for these cameras, to calculate the temperature drops in each instrument. We find that the HRC-I data are consistent with the ACIS-S result, though tending to smaller declines. The ACIS-I data suggest a slightly larger drop. The HRC-S data (with the longest exposures) indicate a marginal temperature decline of 0.9+0.7-0.7 % (90% conf.) over 9 years.

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