Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545303l&link_type=abstract
American Astronomical Society, AAS Meeting #215, #453.03; Bulletin of the American Astronomical Society, Vol. 42, p.463
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The number of pulsars found to reside in globular clusters has increased dramatically over the past ten years thanks largely to improvements in telescopes and computing resources. With 141 pulsars now known in 26 clusters, the time is right to revisit the globular cluster population as a whole. We have begun a project to both discover new pulsars and to characterize the underlying population. For the past year we have been deeply searching twenty globular clusters with the goal of finding new and interesting pulsars, especially millisecond pulsars. This is a significant increase in the number of clusters that have been deeply searched and has resulted in the discovery of seven new pulsars in three clusters. Six of these new pulsars are true MSPs with spin periods <10 ms, while one is a recycled MSP with a 29 ms spin period. Three of the pulsars in binary systems, and one has a mildly eccentric orbit. For two of the clusters, these are the first and only pulsars known. As this phase of our project draws to a close, we are beginning a statistical study of the cluster pulsar population. This study focuses on uncovering the underlying distribution functions for pulsar luminosity, spin period, pulse width, and binary system parameters.
Here we present the results of our searches and timing observations for our seven new MSPs. We also discuss the results from the first phase of our statistical study that focuses on the mysterious young pulsar content of globular clusters. Finally, we look ahead to future aspects of our statistical survey and to the prospects for increasing the sample of globular cluster pulsars even more.
Boyles Jason
Lorimer Duncan
Lynch Ryan
Ransom Scott M.
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