Heated Polar Caps in PSR 0656+14 and PSR 1055-52

Details Heated Polar Caps in PSR 0656+14 and PSR 1055-52 Heated Polar Caps in PSR 0656+14 and PSR 1055-52

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...465l..35g&link_type=abstract

Astrophysical Journal Letters v.465, p.L35

Astronomy and Astrophysics

Astronomy

85

Stars: Pulsars: General, Stars: Pulsars: Individual Alphanumeric: Psr 0656+14, Stars: Pulsars: Individual Alphanumeric: Psr 1055-52, Stars: Neutron

Scientific paper

We present new ASCA observations covering the 0.5--10 keV X-ray range of the cooling neutron star candidates PSR 0656+14 and PSR 1055-52. Previous ROSAT observations had shown that two-component models, either two blackbodies or a blackbody plus a power-law, provided the best spectral fits to their X-ray emission. The combined ASCA and ROSAT spectrum of PSR 0656+14 reveals two blackbody components with T ~ 8 x 105 K and T ~ 1.5 x 106 K and shows evidence that a power-law component is needed to account for higher energy photons. This three-component fit gives a reduced chi 2 that is half the value of a more conventional two component fit (1.3 as compared to 2.4). The fit to the combined spectrum for PSR 1055-52 yields a two-blackbody fit with T ~ 8 x 105 K and T ~ 3.7 x 106 K. Our results favor the existence of a hot polar cap in each of these pulsars with the ratio of the polar cap area to the neutron star surface area being 7 x 10-3 and 3 x 10-5 for PSR 0656+14 and PSR 1055-52, respectively. The results are compared to models that make predictions of polar cap heating processes.

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