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A&A 375, 397-404 (2001)
DOI: 10.1051/0004-6361:20010884
The curved X-ray spectrum of PSR B1509-58 observed with BeppoSAX
G. Cusumano1, T. Mineo1, E. Massaro2, L. Nicastro1, E. Trussoni3, S. Massaglia4, W. Hermsen5 and L. Kuiper51 Istituto di Fisica Cosmica ed Applicazioni all'Informatica CNR, Via U. La Malfa 153, 90146 Palermo, Italy
2 Istituto di Astrofisica Spaziale CNR, via Fosso del Cavaliere, 00113 Roma, Italy
3 Osservatorio Astronomico di Torino, Strada Osservatorio 20, 10025 Pino Torinese, Italy
4 Dipartimento di Fisica Generale dell'Università, Via Pietro Giuria 1, 10125 Torino, Italy
5 SRON-Utrecht, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
(Received 22 October 2000 / Accepted 5 June 2001)
Abstract
We report timing and spectral results
for PSR B1509-58 observed by BeppoSAX
in February 1998.
We obtained pulse profiles with high statistical significance from
0.1 to 300 keV that exhibit the well-known broad asymmetric single pulse.
The shape of this pulse does not change across this energy
window and can be described as the sum of a narrow and a broader Gaussian
component separated
in phase. The spectral distribution
can be accurately represented, over the entire BeppoSAX energy range,
by a curved function rather than a simple power-law shape.
The extrapolation of this model to higher energies is also consistent
with the COMPTEL fluxes in the 0.75-30 MeV range, with the maximum
luminosity for the broad pulse of PSR B1509-58 reached at
MeV.
The comparison with the Crab pulsar spectrum suggests a possible
origin of the X-ray emission in terms of synchrotron radiation
from secondary pair particles near the neutron star.
Key words: stars: neutron -- pulsars: individual: PSR B1509-58 -- X-rays: stars
Offprint request: G. Cusumano, cusumano@ifcai.pa.cnr.it
on leave from Università La Sapienza, Roma, Italy. SIMBAD Objects
© ESO 2001
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