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X-ray follow-up observations of the two gamma-ray pulsars PSR J1459-6053 and PSR J1614-2230

Pancrazi, B. (författare)
Webb, N. A. (författare)
Becker, W. (författare)
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Cognard, I. (författare)
Guillemot, L. (författare)
Hill, A. B. (författare)
Jackson, Miranda, (författare)
KTH, Partikel- och astropartikelfysik
Mignani, R. P. (författare)
Rea, N. (författare)
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KTH Skolan för teknikvetenskap (SCI). Fysik. Partikel- och astropartikelfysik. (creator_code:org_t)
Stockholms universitet Naturvetenskapliga fakulteten. Fysikum. (creator_code:org_t)
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Stockholms universitet Naturvetenskapliga fakulteten. Oskar Klein-centrum för kosmopartikelfysik (OKC). (creator_code:org_t)
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2012
Engelska.
Ingår i: Astronomy and Astrophysics. - 0004-6361. ; 544, s. A108
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Aims. We have observed two newly detected gamma-ray pulsars, PSR J1459-6053 and PSR J1614-2230, in the X-ray domain with XMM-Newton to try to enlarge the sample of pulsars for which multi-wavelength data exist. We use these data with the aim of understanding the pulsar emission mechanisms of these pulsars. Methods. We analysed the X-ray spectra to determine whether the emission emanates from the neutron star surface (thermal emission) or from the magnetosphere (non-thermal emission) and compared this to the region in the magnetosphere in which the gamma-ray emission is generated. Furthermore, we compared the phase-folded X-ray lightcurves with those in the gamma-ray and, where possible, radio domains, to elicit additional information on the emission sites. Results. J1459-6053 shows X-ray spectra that are best fitted with a power law model with a photon index Gamma = 2.10(-0.85)(+1.24). The gamma-ray data suggest that either the slot gap or the outer gap model may be best to describe the emission from this pulsar. Analysis of the X-ray lightcurve folded on the gamma-ray ephemeris shows modulation at the 3.7 sigma level in the 1.0-4.5 keV domain. Possible alignment of the main gamma-ray and X-ray peaks also supports the interpretation that the emission in the two energy domains emanates from similar regions. The millisecond pulsar J1614-2230 exhibits an X-ray spectrum with a substantial thermal component, where the best-fitting spectral model is either two blackbodies, with kT = 0.15(-0.04)(+0.04) and 0.88(-0.54)(+2.54) keV or a blackbody with similar temperature to the previous cooler component, kT = 0.13(-0.02)(+0.04) keV and a power law component with a photon index Gamma = 1.25-(+2.30)(1.75). The cooler blackbody component is likely to originate from the hot surface at the polar cap. Analysis of the X-ray lightcurve folded on the radio ephemeris shows modulation at the 4.0 sigma level in the 0.4-3.0 keV domain.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

X-rays: stars
pulsars: individual: PSR J1459-6053
radiation mechanisms: thermal
stars: neutron
radiation mechanisms: non-thermal
pulsars: individual: PSR J1614-2230

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