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Surrounded by spiders! New black widows and redbacks in the Galactic field

Published online by Cambridge University Press:  20 March 2013

Mallory S. E. Roberts
Mallory S. E. Roberts*
Affiliation:
Eureka Scientific, 2452 Delmer Street, Suite 100, Oakland, CA 94602-3017, USADepartment of Physics, Ithaca College, Ithaca, NY 14850, USA email: malloryr@gmail.com
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Abstract

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Over the last few years, the number of known eclipsing radio millisecond pulsar systems in the Galactic field has dramatically increased, with many being associated with Fermi gamma-ray sources. All are in tight binaries (orbital period < 24 hr) with many being classical “black widows” which have very low mass companions (companion mass Mc ≪ 0.1 M⊙) but some are “redbacks” with low mass (Mc ~ 0.2-0.4 M⊙) companions which are probably non-degenerate. These latter are systems where the mass transfer process may have only temporarily halted, and so are transitional systems between low mass X-ray binaries and ordinary binary millisecond pulsars. Here we review the new discoveries and their multi-wavelength properties, and briefly discuss models of shock emission, mass determinations, and evolutionary scenarios.

Keywords

binaries: closepulsars: generalbinaries: eclipsingshock wavesgamma rays: observationsacceleration of particlesaccretionequation of statepulsars: individual (PSR J2129-0429)X-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S291: Neutron Stars and Pulsars: Challenges and Opportunities after 80 years , August 2012 , pp. 127 - 132
Copyright
Copyright © International Astronomical Union 2013

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