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Title:
The Distance and Age of the Supernova Remnants Kes 73 and AXP 1E 1841-045
Authors:
Tian, W. W.; Leahy, D. A.
Affiliation:
AA(National Astronomical Observatories, CAS, Beijing 100012, China; .; Department of Physics and Astronomy, University of Calgary, AB T2N 1N4, Canada.), AB(Department of Physics and Astronomy, University of Calgary, AB T2N 1N4, Canada.)
Publication:
The Astrophysical Journal, Volume 677, Issue 1, pp. 292-296. (ApJ Homepage)
Publication Date:
04/2008
Origin:
UCP
ApJ Keywords:
Galaxy: Structure, ISM: H II Regions, ISM: Atoms, ISM: Supernova Remnants
DOI:
10.1086/529120
Bibliographic Code:
2008ApJ...677..292T

Abstract

We provide a new distance estimate to the supernova remnant (SNR) Kes 73 and its associated anomalous X-ray pulsar (AXP) 1E 1841-045. 21 cm H I images and H I absorption/emission spectra from new VLA observations, and 13CO emission spectra of Kes 73 and two adjacent compact H II regions (G27.276+0.148 and G27.491+0.189) are analyzed. The H I images show prominent absorption features associated with Kes 73 and the H II regions. The absorption appears up to the tangent point velocity giving a lower distance limit to Kes 73 of 7.5 kpc, which has previously been given as the upper limit. In addition, G27.276+0.148 and G27.491+0.189 are at the far kinematic distances of their radio recombination line velocities. There is prominent H I emission in the range 80-90 km s-1 for all three objects. The two H II regions show H I absorption at ~84 km s-1, but there is no absorption in the Kes 73 absorption spectrum. This implies an upper distance limit of ~9.8 kpc to Kes 73. This corrected larger distance to Kes 73/AXP 1E 1841-045 system leads to a refined age of the SNR of 500-1000 yr, and a ~50% larger AXP X-ray luminosity.
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