SIMBAD references

2012ApJ...746....6D - Astrophys. J., 746, 6 (2012/February-2)

The spectrum of the recycled PSR J0437-4715 and its white dwarf companion.

DURANT M., KARGALTSEV O., PAVLOV G.G., KOWALSKI P.M., POSSELT B., VAN KERKWIJK M.H. and KAPLAN D.L.

Abstract (from CDS):

We present extensive spectral and photometric observations of the recycled pulsar/white dwarf binary containing PSR J0437-4715, which we analyzed together with archival X-ray and gamma-ray data, to obtain the complete mid-infrared to gamma-ray spectrum. We first fit each part of the spectrum separately, and then the whole multi-wavelength spectrum. We find that the optical-infrared part of the spectrum is well fit by a cool white dwarf atmosphere model with pure hydrogen composition. The model atmosphere (Teff= 3950±150 K, log g = 6.98±0.15, RWD= (1.9±0.2)x109 cm) fits our spectral data remarkably well for the known mass and distance (M = 0.25±0.02 M☉, d = 156.3±1.3 pc), yielding the white dwarf age (τWD= 6.0±0.5 Gyr). In the UV, we find a spectral shape consistent with thermal emission from the bulk of the neutron star surface, with surface temperature between 1.25 x105 and 3.5x105 K. The temperature of the thermal spectrum suggests that some heating mechanism operates throughout the life of the neutron star. The temperature distribution on the neutron star surface is non-uniform. In the X-rays, we confirm the presence of a high-energy tail which is consistent with a continuation of the cutoff power-law component (Γ = 1.56±0.01, Ecut= 1.1±0.2 GeV) that is seen in gamma rays and perhaps even extends to the near-UV.

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Journal keyword(s): binaries: general - pulsars: individual: PSR J0437-4715 - white dwarfs - X-rays: binaries

Simbad objects: 9

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