Title:	Vacuum gaps in pulsars and PSR J2144-3933
Authors:	Gil, Janusz Mitra, D.
Keywords:	Magnetic Fields, Stars: Pulsars: General, Radiation Mechanisms: Nonthermal
Issue Date:	20-Mar-2001
Publisher:	The University of Chicago Press for the American Astronomical Society
Citation:	Astrophysical Journal, 2001, Vol.550, p383-391
Abstract:	In this paper we revisit the radio pulsar death line problem within the framework of curvature radiation and/or the inverse Compton scattering-induced vacuum gap model above neutron star polar caps. Our special interest is in the recently detected pulsar PSR J2144-3933 with extremal period 8.5 s, which lies far beyond conventional death lines. We argue that the formation of vacuum gaps requires a complicated multipolar surface magnetic field, with a strength Bs typically much higher than the surface dipolar component Bd and a radii of curvature R much smaller than the neutron star radius R=106 cm. Such a multipolar surface field is also consistent with death lines including the extremal pulsar PSR J2144-3933. Since vacuum gap models produce sparks, our paper naturally supports the spark related models of subpulse drift phenomenon as well as the spark-associated models of coherent pulsar radio emission.
URI:	http://hdl.handle.net/2289/1451
ISSN:	0004-637X 1538-4357(Online)
Alternative Location:	http://dx.doi.org/10.1086/319714
Copyright:	(2001) by the American Astronomical Society.
Appears in Collections:	Research Papers (A&A)

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