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Title:
Detection of X-Ray Emission from the Very Old Pulsar J0108-1431
Authors:
Pavlov, G. G.; Kargaltsev, O.; Wong, J. A.; Garmire, G. P.
Affiliation:
AA(Department of Astronomy and Astrophysics, Pennsylvania State University, PA 16802, USA ), AB(Department of Astronomy and Astrophysics, Pennsylvania State University, PA 16802, USA ; Department of Astronomy, University of Florida, Bryant Space Science Center, Gainesville, FL 32611, USA; ), AC(Department of Astronomy and Astrophysics, Pennsylvania State University, PA 16802, USA ), AD(Department of Astronomy and Astrophysics, Pennsylvania State University, PA 16802, USA )
Publication:
The Astrophysical Journal, Volume 691, Issue 1, pp. 458-464 (2009). (ApJ Homepage)
Publication Date:
01/2009
Origin:
IOP
ApJ Keywords:
pulsars: individual: PSR J0108-1431, stars: neutron, X-rays: stars
DOI:
10.1088/0004-637X/691/1/458
Bibliographic Code:
2009ApJ...691..458P

Abstract

PSR J0108-1431 is a nearby, 170 Myr old, very faint radio pulsar near the "pulsar death line" in the P-\dot{P} diagram. We observed the pulsar field with the Chandra X-ray Observatory and detected a point source (53 counts in a 30 ks exposure; energy flux (9 ± 2) × 10-15 erg cm-2 s-1 in the 0.3-8 keV band) close to the radio pulsar position. Based on the large X-ray/optical flux ratio at the X-ray source position, we conclude that the source is the X-ray counterpart of PSR J0108-1431. The pulsar spectrum can be described by a power-law model with photon index Γ ≈ 2.2 and luminosity L 0.3-8 keV ≈ 2 × 1028 d 2 130 erg s-1, or by a blackbody model with temperature kT ≈ 0.28 keV and bolometric luminosity L bol ≈ 1.3 × 1028 d 2 130 erg s-1, for a plausible hydrogen column density N H = 7.3 × 1019 cm-2 (d 130 = d/130 pc). The pulsar converts ~0.4% of its spin-down power into X-ray luminosity, i.e., its X-ray efficiency is higher than for most younger pulsars. From the comparison of the X-ray position with the previously measured radio positions, we estimated the pulsar proper motion of 0.2 arcsec yr-1 (V bottom ≈ 130d 130 km s-1), in the south-southeast direction.
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