2009ApJ...702L.177D -
Astrophys. J., 702, L177-L181 (2009/September-2)
Discovery of three pulsars from a galactic center pulsar population.
DENEVA J.S., CORDES J.M. and LAZIO T.J.W.
Abstract (from CDS):
We report the discovery of three pulsars whose large dispersion measures (DMs) and angular proximity to Sgr A* indicate the existence of a Galactic center population of neutron stars. The relatively long periods (0.98-1.48 s) most likely reflect strong selection against short-period pulsars from radio-wave scattering at the observation frequency of 2 GHz used in our survey with the Green Bank Telescope. One object (PSR J1746-2850I) has a characteristic spindown age of only 13 kyr along with a high surface magnetic field ∼4 x 1013 G. It and a second object found in the same telescope pointing, PSR J1746-2850II (which has the highest known DM among pulsars), may have originated from recent star formation in the Arches or Quintuplet clusters given their angular locations. Along with a third object, PSR J1745-2910, and two similar high-dispersion, long-period pulsars reported by Johnston et al., the five objects found so far are 10-15 arcmin from Sgr A*, consistent with there being a large pulsar population in the Galactic center, most of whose members are undetectable in relatively low-frequency surveys because of pulse broadening from the same scattering volume that angularly broadens Sgr A* and OH/IR masers.
Abstract Copyright:
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Journal keyword(s):
pulsars: general - pulsars: individual (J1746-2850I, J1746-2850II, J1745-2910)
Simbad objects:
12
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