ASCA Observations of the Composite Supernova Remnant G29.7-0.3

Details ASCA Observations of the Composite Supernova Remnant G29.7-0.3 ASCA Observations of the Composite Supernova Remnant G29.7-0.3

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...470..961b&link_type=abstract

Astrophysical Journal v.470, p.961

Astronomy and Astrophysics

Astronomy

28

Ism: Supernova Remnants, Ism: Individual Alphanumeric: G29.7-0.3, X-Rays: Ism

Scientific paper

We confirm the composite nature of the supernova remnant (SNR) G29.7-0.3 (Kes 75) using observations in the 0.5-8 keV energy range obtained with the ASCA X-ray observatory. Spatial and spectral analyses of the data show that G29.7 -0.3 is composed of a hard X-ray, nonthermal central source and a soft X-ray, thermal shell. Combining the results of our analysis with radio determinations of the distance to G29.7 -0.3 and its shell diameter (Becker & Helfand), we estimate the luminosities of the- two components of the SNR as well as its total mass and age. The Crab-like core has an X-ray luminosity of LX ≍ 1 x 1036 ergs s-1, making it the second most luminous synchrotron nebula in the Galaxy. The thermal X-ray emission of the shell supports an age estimate comparable to that of the Crab, and the shell's inferred composition and mass are consistent with a massive progenitor. An estimate of the current energy loss rate of the unseen pulsar from the synchrotron nebula's X-ray luminosity, coupled with a calculation of the total energy in nebular particles and fields from the shape of the radio-to-X-ray spectrum, also gives an age estimate of ≍1O3 yr.

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