Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..718w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 15, 1986, p. 718-726.
Astronomy and Astrophysics
Astrophysics
16
Crab Nebula, Stellar Spectrophotometry, Supernova Remnants, X Ray Sources, Emission Spectra, Proportional Counters, Radio Spectra, Stellar Luminosity, Synchrotron Radiation
Scientific paper
The three supernova remnants G 291.0-0.1 (MSH 11-62), G 308.7+0.0, and G 328.4+0.2 (MSH 15-57), which resemble the Crab Nebula in many of their radio properties, have been observed with the IPC on the Einstein X-ray observatory. Only G 291.0-0.1 was detected. This source shows very extended (>20arcmin diameter) X-ray emission, with strong central brightening. The spectral data for the bright central region are consistent with a power law of photon index α ≈ 1.8. The X-ray spectrum is considerably softer (α ≈ 3.6) in the outer parts of the object. Given the large distances and hydrogen column densities to G 308.7+0.0 and G 328.4+0.2, their X-ray limits are consistent with membership in the Crab Nebula-like group. The evolutions of radio luminosity LR, X-ray luminosity, LX, and their ratio LX/LR with remnant diameter are reassessed for this class of supernova remnant.
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