Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437..458s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 437, no. 1, p. 458-464
Astronomy and Astrophysics
Astronomy
15
Emission Spectra, Pulsars, Spaceborne Astronomy, Stellar Spectra, X Ray Astronomy, X Ray Spectra, X Ray Stars, Astronomical Spectroscopy, Black Body Radiation, Proportional Counters, Rosat Mission, X Ray Spectroscopy
Scientific paper
We have obtained a 20 ks observation of PSR 0355+54 using the ROSAT position sensitive proportional counter (PSPC). The pulsar is detected with a count rate of 4.2(+/- 1.3) x 10-3/s above the background. While the approximately 70 source counts are insufficient for spectral fitting, we have derived source parameters for specific cases of power law as well as blackbody spectra. For a Crab-like spectrum (photon index alpha = 2) we find Lx(0.1-2.4 keV) = 1.0 x 1032 ergs/s, somewhat higher than upper limits reported from Einstein observations but consistent with typical Lx versus E-dot values for other pulsars. For blackbody emission, we derive a temperature upper limit of approximately 9.5 x 105 K for emission from the entire neutron star surface, which is consistent with standard models for cooling of the neutron star interior given a characteristic age 105.75 yr. No evidence is present for modulation at the 156 ms pulsar period, setting a weak upper limit of approximately 75% for the pulsed fraction of the X-ray signal.
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