Mathematics – Probability
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...21116101f&link_type=abstract
American Astronomical Society, AAS Meeting #211, #161.01
Mathematics
Probability
Scientific paper
We present here the results of Arecibo timing of PSR B1516+02B, a 7.95-ms pulsar in a binary system with a 0.17 solar mass companion and an orbital period of 6.85 days located in the globular cluster M5. The eccentricity of the orbit (e = 0.14) has allowed a measurement of the rate of advance of periastron: (0.0136 +/- 0.0007) degrees per year. It is very likely that the periastron advance is due to the effects of general relativity; the total mass of the binary system is (2.14 +/-0.16) solar masses. The small measured mass function implies, in a statistical sense, that a very large fraction of this total mass is contained in the pulsar: (1.94+0.17 -0.19) solar masses (1-sigma); there is a 5% probability that the mass of this object is below 1.59 solar masses. With the possible exception of PSR J1748-2021B, this is the largest neutron star mass measured to date. When combined with similar measurements made previously for Terzan 5 I and J, we obtain probabilities of 99 and 95% that at least one of these pulsars is more massive than 1.72 and 1.79 solar masses, i.e., we can exclude, in a statistical sense, the ``soft'' equations of state for dense neutron matter, implying that matter at the center of a neutron star is highly incompressible. There is also some evidence for a bimodal distribution of millisecond pulsar masses, the reasons for that are not clear.
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