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Title:
Discovery and Timing of Eight New Millisecond Pulsars in NGC 6440 and NGC 6441
Authors:
Freire, Paulo; Ransom, S. M.; Begin, S.; Stairs, I. H.; Hessels, J. W.
Affiliation:
AA(Arecibo Observatory), AB(NRAO), AC(University of British Columbia, Canada), AD(University of British Columbia, Canada), AE(McGill University, Canada)
Publication:
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #159.03; Bulletin of the American Astronomical Society, Vol. 38, p.1118
Publication Date:
12/2006
Origin:
AAS
Bibliographic Code:
2006AAS...20915903F

Abstract

Motivated by the recent discovery of 30 new millisecond pulsars in Terzan 5, made using the Green Bank Telescope's S-band receiver and the Pulsar Spigot, we have set out to use the same system in a systematic search for pulsars in other rich globular clusters. We here report on some of the first results from this survey, the discovery of five new millisecond pulsars in the globular cluster NGC 6440 and three new ones in NGC 6441; each cluster has one previously known pulsar. The pulsar population in these clusters is remarkably diverse, with spin periods between 3.8 and 288 ms; five of these ten pulsars are found in binary systems. We present timing solutions for seven of the eight newly discovered pulsars. One of these, PSR J1748-2021B in NGC 6440, is notable for its eccentric orbit, which has allowed the measurement of the rate of advance of periastron and of the total mass of this system. Another of the new pulsars, NGC 6440D, is an eclipsing binary with a 0.12 solar mass companion, which probably is a main sequence star.
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