Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...452l.115s&link_type=abstract
Astrophysical Journal Letters v.452, p.L115
Astronomy and Astrophysics
Astronomy
11
Stars: Pulsars: General, Radiation Mechanisms: Nonthermal, Radiation Mechanisms: Thermal, X-Rays: Stars
Scientific paper
The soft X-ray emission from isolated neutron stars (NSs) may originate from a number of processes, each of which probes a unique characteristic of the interior or magnetospheric structure. In order to characterize this emission in the context of current models, we have begun an archival investigation of such emission using data from the ROSAT Observatory. Here we report on analysis for seven pulsars based upon data taken with the ROSAT Position Sensitive Proportional Counter (PSPC). For each pulsar, we derive upper limits for the NS surface temperature as well as luminosity values or upper limits associated with a Crab-like power-law interpretation. Several of the pulsars were detected, and for these we have investigated scenarios for emission associated with the cooling of the hot NS interior as well as with the pulsar spin down. The emission from PSR 2334+61 and PSR 0114+58 appears consistent with a spin-down origin, although we cannot rule out emission associated with cooling of the NS interior. For PSR 1822-09, we find that the surface temperature upper limit implied by the nondetection falls below the predictions of several cooling models, potentially providing constraints on interpretations of the interior equation of state. Emission from the vicinity of PSR 1642-03 may be produced by an extended synchrotron nebula associated with the pulsar, but such models appear problematic. Alternatively, the observed flux may be produced by a background object in the field of the pulsar position.
Lloyd Nicole
Slane Patrick
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