view Abstract Citations (68) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Vortex creep and the internal temperature of neutron stars : timing noise in pulsars. Alpar, M. Ali ; Nandkumar, Radha ; Pines, David Abstract Vortex creep theory is used to construct model noise power spectra for three physically distinct types of events which might give rise to pulsar timing noise. These are 'pure' events, in which vortex unpinning is the source of the initial frequency jump; 'mixed' events, in which the initial frequency jump is produced by some physical process other than vortex unpinning but leads to the unpinning of some vortices; and 'external' events, in which the initial frequency jumps responsible for noise do not involve any vortex unpinning. For the first two types of events, it is found that relaxation processes in the region responsible for the noise will give rise to structure in the observed power spectra, while for external events, the resulting noise spectra will not be influenced by vortex creep. The theoretical results are compared with observed power spectra for 25 pulsars. The absence of structure in the observed power spectra of the Crab and Vela pulsars within the range of time scales which characterize their postglitch behavior indicates that the pinning regions which play a role in postglitch behavior do not experience the small unpinning events leading to timing noise. Publication: The Astrophysical Journal Pub Date: December 1986 DOI: 10.1086/164765 Bibcode: 1986ApJ...311..197A Keywords: Neutron Stars; Pulsars; Stellar Interiors; Stellar Temperature; Noise Spectra; Power Spectra; Relaxation Time; Vortices; Astrophysics full text sources ADS | data products SIMBAD (25)