New Pulsars in the Globular Cluster M28

Details New Pulsars in the Globular Cluster M28 New Pulsars in the Globular Cluster M28

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20915902s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #159.02; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

3

Scientific paper

We have discovered ten new pulsars in recent observations of the globular cluster M28 (NGC6626) with the Green Bank Telescope. M28 is now the globular cluster with the third largest population of known pulsars, after Terzan 5 and 47 Tucanae. We have obtained phase-coherent timing solutions for most of the new MSPs. Seven new MSPs are in binary systems, of which one shows eclipses, two have very low-mass companions and two have highly eccentric orbits. We have measured the rate of advance of periastron for one of the two highly eccentric binaries (M28C), which yields a total system mass of 1.616+/-0.007 MSun. We use the ensemble of pulsars to investigate the gravitational potential and mass-to-light ratio of M28. One of the new pulsars, M28F, is an isolated MSP far from the center of M28; this may have implications for dynamics in the core of the cluster.

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