We present the results of a broad band (3-200 keV) spectral analysis of BeppoSAX and XMM-Newton observations of the Vela plerion. The hard X-ray (> 15 keV) emission is found to be extended over a region of 12'-15' radius, corresponding to a size of about 1.0-1.3 pc for a source distance of 290 pc. A single power law does not give an acceptable fit while a broken power law or a log-parabolic law nicely fit the data. The former spectral model has the photon index Gamma(1) = 1.66 +/- 0.01 for energies lower than the break value equal to 12.5 keV and the index Gamma(2) = 2.01 +/- 0.05 up to about 200 keV. The total X-ray luminosity of the Vela plerion is L-X = 5.5 x 10(33) erg s(-1), which implies a conversion factor of the spin-down power of similar to 10(-3).
The extended hard X-ray emission from the Vela Plerion / V., Mangano; Massaro, Enrico; F., Bocchino; T., Mineo; G., Cusumano. - In: ASTRONOMY & ASTROPHYSICS. - ISSN 0004-6361. - 436:3(2005), pp. 917-923. [10.1051/0004-6361:20042367]
The extended hard X-ray emission from the Vela Plerion
MASSARO, Enrico;
2005
Abstract
We present the results of a broad band (3-200 keV) spectral analysis of BeppoSAX and XMM-Newton observations of the Vela plerion. The hard X-ray (> 15 keV) emission is found to be extended over a region of 12'-15' radius, corresponding to a size of about 1.0-1.3 pc for a source distance of 290 pc. A single power law does not give an acceptable fit while a broken power law or a log-parabolic law nicely fit the data. The former spectral model has the photon index Gamma(1) = 1.66 +/- 0.01 for energies lower than the break value equal to 12.5 keV and the index Gamma(2) = 2.01 +/- 0.05 up to about 200 keV. The total X-ray luminosity of the Vela plerion is L-X = 5.5 x 10(33) erg s(-1), which implies a conversion factor of the spin-down power of similar to 10(-3).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
