XMM-Newton Observation of the Nearby Pulsar B1133+16
We constrain the X-ray properties of the nearby (360 pc), old (5 Myr) pulsar B1133+16 with ∼100 ks effective exposure time by XMM-Newton. The observed pulsar flux in the 0.23 keV energy range is ∼10-14 erg cm-2 s-1, which results in the recording of ∼ 600 source counts with the EPIC pn and MOS detectors. The X-ray radiation is dominated by nonthermal radiation and is well described by both a single power-law model (PL) and a sum of blackbody and power-law emission (BB+PL). The BB+PL model results in a spectral photon index γ = 2.4+0.3 0.4 and a nonthermal flux in the 0.2-3 keV energy range of (7 ï¿½ 2) ï¿½ 10-15 erg cm-2 s-1. The thermal emission is consistent with the blackbody emission from a small hot spot with a radius of Rpc ≈ 14+ 7 -5 m and a temperature of = Ts 2.9+ 0.6 0.4 MK. Assuming that the hot spot corresponds to the polar cap of the pulsar, we can use the magnetic flux conservation law to estimate the magnetic field at the surface Bs ≈ 3.9 ï¿½ 1014 G . The observations are in good agreement with the predictions of the partially screened gap model, which assumes the existence of smallscale surface magnetic field structures in the polar cap region. ï¿½ 2017. The American Astronomical Society. All rights reserved.
Melikidze, G. I.,
XMM-Newton Observation of the Nearby Pulsar B1133+16.
Astrophysical Journal, 835(2),