Astronomy and Astrophysics, volume 434, 1097-1105 (2005/5-2)
PSR B1929+10 revisited in X-rays.
SLOWIKOWSKA A., KUIPER L. and HERMSEN W.
Abstract (from CDS):
We performed timing and spectral analyses for PSR B1929+10, one of the oldest (∼107
-years) of the ordinary pulsars detected in X-rays, using archival ROSAT, ASCA and RXTE data. Pulsed emission was detected at a more than five sigma level for the combined ROSAT PSPC-B and previously unpublished HRI data. Our pulse profile is in agreement with that obtained by Yancopoulos et al. (1994ApJ...429..832Y
, ROSAT PSPC-B) but now with better statistics. The pulsed fraction in the ROSAT X-ray band is 0.25±0.04. The pulsed signal has also been detected in the ASCA GIS data (0.5-5keV) with a similar pulsed fraction of 0.36±0.11. No significant timing signal is found in the RXTE PCA data (>2keV). We found that the combined ROSAT PSPC-B and ASCA GIS spectrum can satisfactorily be described by a power-law as well as by a double black-body model but not by a single black-body model or black-body plus power law model. Fitting the combined ROSAT/ASCA 0.1-10keV spectrum by a power-law model we obtain a photon index α of 2.54 ±0.12 and a neutral hydrogen column density NH
towards the source of 9.8–1.0+1.4
. For a double black-body fit our results are T1
K and NH
. In both cases the derived value of NH
is higher than that adopted in earlier works, but our result is fully consistent with the larger distance estimate of 331±10pc from parallax measurements combined with the hydrogen distribution measurements in the direction to the pulsar.
stars: neutron - pulsars: individual: PSR B1929+10
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