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LOFAR discovery of the fastest-spinning millisecond pulsar in the Galactic field
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LOFAR discovery of the fastest-spinning millisecond pulsar in the Galactic field
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Paper
LOFAR discovery of the fastest-spinning millisecond pulsar in the Galactic field
2017
Overview
We report the discovery of PSR J0952\\(-\\)0607, a 707-Hz binary millisecond pulsar which is now the fastest-spinning neutron star known in the Galactic field (i.e., outside of a globular cluster). PSR J0952\\(-\\)0607 was found using LOFAR at a central observing frequency of 135 MHz, well below the 300 MHz to 3 GHz frequencies typically used in pulsar searches. The discovery is part of an ongoing LOFAR survey targeting unassociated Fermi Large Area Telescope \\(\\)-ray sources. PSR J0952\\(-\\)0607 is in a 6.42-hr orbit around a very low-mass companion (\\(M_c0.02\\) M\\(_\\)) and we identify a strongly variable optical source, modulated at the orbital period of the pulsar, as the binary companion. The light curve of the companion varies by 1.6 mag from \\(r^=22.2\\) at maximum to \\(r^>23.8\\), indicating that it is irradiated by the pulsar wind. Swift observations place a 3-\\(\\) upper limit on the \\(0.3-10\\) keV X-ray luminosity of \\(L_X < 1.1 10^31\\) erg s\\(^-1\\) (using the 0.97 kpc distance inferred from the dispersion measure). Though no eclipses of the radio pulsar are observed, the properties of the system classify it as a black widow binary. The radio pulsed spectrum of PSR J0952\\(-\\)0607, as determined through flux density measurements at 150 and 350 MHz, is extremely steep with \\(-3\\) (where \\(S ^\\)). We discuss the growing evidence that the fastest-spinning radio pulsars have exceptionally steep radio spectra, as well as the prospects for finding more sources like PSR J0952\\(-\\)0607.
Publisher
Cornell University Library, arXiv.org
Subject
