Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-08-21
Astrophys.J.639:377-381,2006
Astronomy and Astrophysics
Astrophysics
14 pages, 1 figure, 1 table, accepted for publication in ApJ
Scientific paper
10.1086/497327
We report on the first XMM-Newton observation of the Vela-like pulsar PSR B2334+61. Spectral analysis reveals soft X-ray emission, with the bulk of the photons emitted at energies below ~1.5 keV. We find that the spectrum has a thermal origin and is well-fitted with either a blackbody or a magnetized, pure H atmospheric model. In the latter case, for a neutron star with a radius of 13 km and a magnetic field of 10e13 G, the best-fit gives an hydrogen column density nH = 0.33 x 10^22 cm^-2 and an effective temperature T_eff^infinity = 0.65 x 10^6 K, as measured at Earth. A comparison of the surface temperature of PSR B2334+61 obtained from this fit with cooling curves favor a medium mass neutron star with M ~ 1.45 solar masses or M ~ 1.6 solar masses, depending on two different models of proton superfluidity in the interior. We do not detect any pulsed emission from the source, and determine an upper limit of 5% for the modulation amplitude of the emission on the pulsar's radio frequency.
Cropper Mark
Ho Cheng
McGowan Katherine E.
Vestrand Thomas W.
Zane Silvia
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