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Title:
Unusual Pulsed X-Ray Emission from the Young, High Magnetic Field Pulsar PSR J1119-6127
Authors:
Gonzalez, M. E.; Kaspi, V. M.; Camilo, F.; Gaensler, B. M.; Pivovaroff, M. J.
Affiliation:
AA(Department of Physics, Rutherford Physics Building, McGill University, Montreal, QC H3A 2T8, Canada.), AB(Department of Physics, Rutherford Physics Building, McGill University, Montreal, QC H3A 2T8, Canada.), AC(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027.), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AE(Lawrence Livermore National Laboratory, P.O. Box 808, L-258, Livermore, CA 94550.)
Publication:
The Astrophysical Journal, Volume 630, Issue 1, pp. 489-494. (ApJ Homepage)
Publication Date:
09/2005
Origin:
UCP
ApJ Keywords:
ISM: Individual: Alphanumeric: G292.2-0.5, Stars: Pulsars: Individual: Alphanumeric: PSR J1119-6127, ISM: Supernova Remnants, X-Rays: ISM
DOI:
10.1086/432032
Bibliographic Code:
2005ApJ...630..489G

Abstract

We present XMM-Newton observations of the radio pulsar PSR J1119-6127, which has an inferred age of 1700 yr and surface dipole magnetic field strength of 4.1×1013 G. We report the first detection of pulsed X-ray emission from PSR J1119-6127. In the 0.5-2.0 keV range, the pulse profile shows a narrow peak with a very high pulsed fraction of 74%+/-14%. In the 2.0-10.0 keV range, the upper limit for the pulsed fraction is 28% (99% confidence). The pulsed emission is well described by a thermal blackbody model with a temperature of T∞=2.4+0.3-0.2×106 K and emitting radius of 3.4+1.8-0.3 km (at a distance of 8.4 kpc). Atmospheric models result in problematic estimates for the distance/emitting area. PSR J1119-6127 is now the radio pulsar with smallest characteristic age from which thermal X-ray emission has been detected. The combined temporal and spectral characteristics of this emission are unlike those of other radio pulsars detected at X-ray energies and challenge current models of thermal emission from neutron stars.
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