Mathematics – Logic
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...184.5603s&link_type=abstract
American Astronomical Society, 184th AAS Meeting, #56.03; Bulletin of the American Astronomical Society, Vol. 26, p.950
Mathematics
Logic
Scientific paper
The unusual supernova remnant CTB 80, containing the 39.5 millisecond pulsar PSR 1951+32, has been observed with the Position Sensitive Proportional Counter (PSPC) and the High Resolution Imager (HRI) on board the {ROSAT} satellite. Morphological studies of CTB 80 in the radio energy band reveal a plerionic (i.e. center-filled) component and a shell-like component classifying CTB 80 as a composite-type SNR. Previous X-ray observations show a centrally located point source, coincident with the radio core and surrounded by diffuse emission. The {ROSAT} observations allowed a clear detection of the pulsar, a compact nebula of ~ 1 \am \ radius, and a diffuse nebula extended ~ 5 \am \ eastward of the pulsar. All components were modelled with power law type spectra, with a range of acceptable column density and spectral index combinations. For the particular values of photon index Gamma ~ 2 and an interstellar column density of N_H ~ 3 times 10(21) cm(-2) , the luminosities are ~ \ 2.3 \ times \ 10(33) \ d_{2.5}(2) ergs s(-1) from the point-like source, ~ \ 3.9 \ times \ 10(33) \ d_{2.5}(2) ergs s(-1) from the compact nebula, and ~ \ 1.8 \ times \ 10(33) \ d_{2.5}(2) ergs s(-1) from the 5\am \ diffuse nebula. The total combined luminosity represents >= 0.2 % of the spin-down luminosity of the pulsar (dot {E} = 4 times 10(36) ergs s(-1) ). We have also detected pulsations from the 39.5 ms pulsar at the 99% confidence level. The implied pulsed fraction is ~ 35% with a complicated energy-dependent behaviour. The full 2(o) times 2(o) PSPC image shows also a hard cone-like emission feature extending south-east of the pulsar out to the edge of the detector. The corresponding spectrum is best described by a two-temperature component Raymond-Smith thermal plasma with an average temperature of ~ 10(7) K with an interstellar absorption column density of N_H ~ 3 times 10(21) cm(-2) . In the following, we present our {ROSAT} analysis and discuss our results.
Finley John P.
Ogelman Hakki
Safi-Harb Samar
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