Deep Xmm-newton Spectroscopic and Timing Observations of the Isolated Radio Millisecond Pulsar Psr J0030+0451
نویسندگان
چکیده
We present deep XMM-Newton EPIC spectroscopic and timing X-ray observations of the nearby solitary radio millisecond pulsar, PSR J0030+0451. Its emission spectrum in the 0.1–10 keV range is found to be remarkably similar to that of the nearest and best studied millisecond pulsar, PSR J0437–4715, being well described by a predominantly thermal two-temperature model plus a faint hard tail evident above ∼2 keV. The pulsed emission in the 0.3–2 keV band is characterized by two broad pulses with pulsed fraction ∼60-70%, consistent with a mostly thermal origin of the X-rays only if the surface polar cap radiation is from a light-element atmosphere. Modeling of the thermal pulses permits us to place constraints on the neutron star radius of R > 10.7 (95% confidence) and R > 10.4 km (at 99.9% confidence) for M = 1.4 M⊙. Subject headings: pulsars: general — pulsars: individual (PSR J0030+0451) — stars: neutron — X-rays: stars — relativity
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