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AuthorsP.C.C. Freire, S.M. Ransom, S. Bégin, I.H. Stairs, J.W.T. Hessels, L.H. Frey, F. Camilo
TitleEight new millisecond pulsars in NGC 6440 and NGC 6441
JournalAstrophysical Journal
Volume675
Year2008
Issue1
Pages670-682
ISSN0004637X
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
AbstractMotivated 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 spectrometer, we have set out to use the same observing system in a systematic search for pulsars in other globular clusters. Here we report on the discovery of five new pulsars in NGC 6440 and three in NGC 6441; each cluster previously had one known pulsar. Using the most recent distance estimates to these clusters, we conclude that there are as many potentially observable pulsars in NGC 6440 and NGC 6441 as in Terzan 5. We present timing solutions for all of the pulsars in these globular clusters. Four of the new discoveries are in binary systems; one of them, PSR J1748 - 2021B(NGC 6440B), has a wide (P-b = 20.5 days) and eccentric (e = 0.57) orbit. This allowed a measurement of its rate of advance of periastron, omega = 0.00391(18)degrees yr(-1). If this is a purely relativistic effect, the total mass of this binary system is 2.92 +/- 0.20 M-circle dot (1 sigma) implying a median pulsar mass of 2.74 +/- 0.21M(circle dot). There is a 1% probability that the inclination is low enough that pulsar mass is below 2M(circle dot), and 0.10% probability that it is between 1.20 and 1.44 M-circle dot. If confirmed, this anomalously large mass would strongly constrain the equation of state for dense matter. The other highly eccentric binary, PSR J1750 - 37A, has e = 0.71, and <(omega)over dot> = 0.0055(3)degrees yr(-1), implying a total system mass of 1.97 +/- 0.15 M-circle dot and, along with the mass function, maximum and median pulsar masses of 1.65 and 1.26 M-circle dot, respectively.
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