Kaplan, D. L. and Gaensler, B. M. and Kulkarni, S. R. and Slane, P. O. (2006) An X-Ray Search for Compact Central Sources in Supernova Remnants. II. Six Large-Diameter SNRs. Astrophysical Journal Supplement Series, 163 (2). pp. 344-371. ISSN 0067-0049 http://resolver.caltech.edu/CaltechAUTHORS:20110427-153047409
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We present the second in a series of studies in which we have searched for undiscovered neutron stars in supernova remnants (SNRs). This paper deals with the six largest SNRs in our sample, too large for Chandra or XMM-Newton to cover in a single pointing. These SNRs are nearby, with typical distances of <1 kpc. We therefore used the ROSAT Bright Source Catalog and past observations in the literature to identify X-ray point sources in and near the SNRs. Out of 54 sources, we were immediately able to identify optical/IR counterparts to 41 from existing data. We obtained Chandra snapshot images of the remaining 13 sources. Of these, 10 were point sources with readily identified counterparts, two were extended, and one was not detected in the Chandra observation but is likely a flare star. One of the extended sources may be a pulsar wind nebula, but if so it is probably not associated with the nearby SNR. We are then left with no identified neutron stars in these six SNRs down to luminosity limits of ~10^(32) ergs s^(-1). These limits are generally less than the luminosities of typical neutron stars of the same ages, but are compatible with some lower luminosity sources such as the neutron stars in the SNRs CTA 1 and IC 443.
|Additional Information:||© 2006 American Astronomical Society. Received 2005 November 18; accepted 2006 January 13. We thank an anonymous referee for helpful comments. D. L. K. was partially supported by a fellowship from the Fannie and John Hertz Foundation. B. M. G. and P. O. S. acknowledge support from NASA contract NAS8-39073 and grant G02-3090. B. M. G. is supported by NASA LTSA grant NAG5-13032. S. R. K. is supported by grants from NSF and NASA. Support for this work was provided by the National Aeronautics and Space Administration through Chandra award GO3-4088X issued by the Chandra X-Ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-39073. The NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The Digitized Sky Surveys were produced at the Space Telescope Science Institute under US Government grant NAGW-2166. We have made extensive use of the SIMBAD database, and we are grateful to the astronomers at the Centre de Donne´es Astronomiques de Strasbourg for maintaining this database. We would like to thank E. Persson and C. Rakowski for assistance with the PANIC observing, and D. Fox for assistance with the P60 observing. Facilities: CXO (ACIS-S3), PO:1.5m (P60CCD), Magellan: Clay (MagIC,PANIC), Hale (LFC)|
|Subject Keywords:||pulsars: general; stars: neutron; supernova remnants; X-rays: stars|
|Official Citation:||An X-Ray Search for Compact Central Sources in Supernova Remnants. II. Six Large-Diameter SNRs D. L. Kaplan et al. 2006 ApJS 163 344|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||28 Apr 2011 15:02|
|Last Modified:||26 Dec 2012 13:11|
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