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Title:
Kes 73: A Young Supernova Remnant with an X-Ray--bright, Radio-quiet Central Source
Authors:
Gotthelf, E. V.; Vasisht, G.
Publication:
Astrophysical Journal Letters v.486, p.L133 (ApJL Homepage)
Publication Date:
09/1997
Origin:
APJ
DOI:
10.1086/310846
Bibliographic Code:
1997ApJ...486L.133G

Abstract

We clarify the nature of the small-diameter supernova remnant (SNR) Kes 73 and its central compact source, 1E 1841-045, using X-ray data acquired with ASCA. We introduce a spatiospectral decomposition technique necessary to disentangle the ASCA spectrum of the compact source from the barely resolved shell-type remnant. The source spectrum (1--8 keV) is characterized by an absorbed power law with a photon index alpha ~= 3.4 and NH ~= 3.0 x 1022 cm-2, possibly nonthermal in nature. This bright X-ray source is likely a slowly spinning pulsar, whose detection is reported in our companion paper. The SNR spectrum is characteristic of a thermal plasma, with kT ~= 0.6 keV and emission lines typical of a young remnant. The element Mg and possibly O and Ne are found to be overabundant, qualitatively suggesting an origin from a massive progenitor. We find that Kes 73 is a young (<~2000 yr) Type II/Ib SNR containing a neutron star pulsar spinning anomalously slowly for its age. Kes 73 is yet another member of a growing class of SNRs containing radio-quiet compact sources with a hard spectral signature.
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