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- W3106475956 abstract "Previous work on the emission from isolated old neutron stars (IONSs) accreting from the interstellar medium (ISM) has focused on gravitational capture—i.e., Bondi accretion. We propose a new class of sources that accrete via magnetic interaction with the ISM. While for the Bondi mechanism the accretion rate Bondi decreases with increasing neutron star velocity, in magnetic accretors (MAGACs) MAGAC increases with increasing neutron star velocity (Bondi ∝ v-3 vs. MAGAC ∝ v1/3). MAGACs will be produced among high-velocity (≳100 km s-1), high magnetic field (B > 1014 G) radio pulsars—the magnetars—after they have evolved first through magnetic dipole spin-down, followed by a propeller phase (during which the object sheds angular momentum on a timescale ≲1010 yr). The properties of MAGACs may be summarized thus: dipole magnetic fields of B ≳ 1014 G; minimum velocities relative to the ISM of 25-100 km s-1 or higher, depending on B, well below the median in the observed radio pulsar population; spin periods of greater than days to years; accretion luminosities of 1028-1031 ergs s-1; and effective temperatures kTeff = 0.3-2.5 keV if they accrete onto the magnetic polar cap. We find no examples of MAGACs among previously observed source classes (anomalous X-ray pulsars, soft gamma-ray repeaters, or known IONs). However, MAGACs may be more prevalent in flux-limited X-ray catalogs than their gravitationally accreting counterparts." @default.
- W3106475956 created "2020-11-23" @default.
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- W3106475956 date "2001-06-01" @default.
- W3106475956 modified "2023-09-23" @default.
- W3106475956 title "Magnetically Accreting Isolated Old Neutron Stars" @default.
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- W3106475956 doi "https://doi.org/10.1086/320991" @default.
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