Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-01-04
2011, ApJ, 730, L11
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
12 pages, 3 figures, 2 tables
Scientific paper
10.1088/2041-8205/730/1/L11
We report the results of pulsar searches in ten globular clusters using the Robert C. Byrd Green Bank Telescope. One new binary millisecond pulsar has been discovered in NGC 5986 with P=2.6 ms, P_orb=1.3 d, and a minimum companion mass of 0.16 M_sun. The companion is most likely a Helium white dwarf. Eight of the globular clusters we searched have central densities <10^4 L_sun pc^-3, making this a good sample for studying the pulsar content of low density clusters. We find no evidence for pulsars in clusters with very low densities <10^3 L_sun pc^-3, consistent with theoretical predictions. Null results in many of clusters we searched with moderate densities indicate that these systems do not contain a bright MSP. Two clusters in particular, one with very low metallicity, stand in contrast to theoretical calculations by Ivanova et al. (2008). We also find that three body exchange interaction rates calculated by Phinney (1996) seem to over predict the pulsar content in the clusters we studied.
Lynch Ryan S.
Ransom Scott M.
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