Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...459l...9h&link_type=abstract
Astrophysical Journal Letters v.459, p.L9
Astronomy and Astrophysics
Astronomy
11
Stars: Neutron, X-Rays: Stars
Scientific paper
A possible X-ray detection of the newly discovered binary millisecond radio pulsar PSR J1012+5307 was obtained from an archival ROSAT observation. The 80 +/- 24 photons detected correspond to a 0.1--2.4 keV luminosity of ~2.5 x 1030 ergs s-1 at the nominal dispersion measure distance of 520 pc. This luminosity is a factor of 2 less than that of PSR J0437-4715, a near twin of PSR J1012+5307 in its spin parameters and energetics, and the only millisecond pulsar from which pulsed X-rays have definitely been detected. PSR J1012+5307 is also within 6 deg of the "H I hole" in Ursa Major, providing a new estimate of the electron column density through this region, which confirms that the ionized column density is also low. The small neutral column density to PSR J1012+5307, NH < 7.5 x 1019 cm-2, will facilitate future soft X-ray study, which will help to discriminate between thermal and nonthermal origins of the X-ray emission in millisecond pulsars.
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