New Distances to Galactic Supernova Remnants from HI Absorption Spectra

Details New Distances to Galactic Supernova Remnants from HI Absorption Spectra New Distances to Galactic Supernova Remnants from HI Absorption Spectra

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110023l&link_type=abstract

American Astronomical Society, AAS Meeting #211, #100.23; Bulletin of the American Astronomical Society, Vol. 39, p.915

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We analyse new HI spectra of Galactic supernova remnants (SNRs) together with 13CO(J=1-0) spectra to obtain new distance estimates and evidence for interaction between SNRs and molecular clouds. The SNRs that we study include: the two SNRs associated with TeV sources-- G18.8+0.3 and G23.3-0.3 (W41); one young SNR associated with an Anomalous X-ray Pulsar (AXP)-- Kes 73 associated with AXP 1E1841+045; one SNR with the young pulsar/pulsar wind nebula PSR J1846-0258 at center-- Kes 75; and Kes 69. The HI data come from the observations of the VLA Galactic Plane Survey. The 13CO(J=1-0) data are from the Galactic ring survey taken by the Five College Radio Astronomy Observatory 14m telescope. The HI spectra are constructed using new methods which include improved background subtraction and spurious emission rejection.The CO spectra are used to help distinguish between HI absorption features that occur either closer than or further than the tangent point, thus help to resolve the distance ambiguity. The revised distances we obtain for the six SNRs are: Kes 75-- 5.3 kpc; Kes 73-- 5.2 kpc, Kes 73-- 7.5-9.4 kpc, W41-- 3.9-4.5 kpc, G18.8+0.3-- 12 kpc. Some of these values differ greatly from previously published values, primarily because our methods resolve the near/far distance ambiguity, which may have previously incorrectly done. The distance changes can result in significant changes in interpretation of the SNR (and associated object) properties.
This work supported by the Natural Sciences and Engineering Research Council of Canada.

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