• Corpus ID: 9303075

The 2- 10 keV emission properties of PSR B1937+21

@inproceedings{Nicastro2002The21,
  title={The 2- 10 keV emission properties of PSR B1937+21},
  author={Luciano Nicastro and G Cusumano and Lucien Kuiper and Werner Becker and W. Hermsen and Michael Kramer},
  year={2002}
}

• L. Nicastro, G. Cusumano, +3 authors M. Kramer
• Published 2 September 2002
• Physics

We present the results of a BeppoSAX obser- vation of the fastest pulsar known: PSR B1937+21. The ∼ 200 ks observation (78.5 (34) ks MECS (LECS) expo- sure times) allowed us to investigate with high statistical significance both the spectral properties and the pulse pro- file shape. The absorbed power law spectral model gave a photon index of ∼ 1.7 and NH ∼ 2.3 × 10 22 cm −2 . These values explain both a. the ROSAT non-detection and b. the deviant estimate of a photon index of ∼ 0.8 obtained by ASCA. The pulse profile appears, for the first time, clearly double peaked with the main component much stronger than the other. The statistical significance is 10� (main peak) and 5� (secondary peak). The 1.6-10 keV pulsed fraction is consistent with 100%; only in the 1.6-4 keV band there is a ∼ 2� indication for a DC component. The secondary peak is detected significantly only for en- ergies above 3 ÷ 4 keV. The unabsorbed (2-10 keV) flux is F2−10 = 3.7 × 10 −13 erg cm −2 s −1 , implying a lumi- nosity of LX = 4.6 × 10 31 � (d/3.6 kpc) 2 erg s −1 and an X-ray efficiency of� = 4 × 10 −5 �, whereis the solid angle spanned by the emission beam. These results are in agreement with those obtained by ASCA.