Dynamical Formation of Millisecond Pulsars in Globular Clusters

Details Dynamical Formation of Millisecond Pulsars in Globular Clusters Dynamical Formation of Millisecond Pulsars in Globular Clusters

2010-03-23

arxiv.org/abs/1003.4332v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

18 pages, 3 figures, 4 tables, accepted for publication in ApJ

Scientific paper

The cumulative luminosity distribution functions (CLFs) of radio millisecond pulsars (MSPs) in globular clusters (GCs) and in the Galactic field at a frequency of 1.4 GHz have been examined. Assuming a functional form, $N \propto L^q$ where $N$ is the number of MSPs and $L$ is the luminosity at 1.4 GHz, it is found that the CLFs significantly differ with a steeper slope, $q=-0.83 \pm 0.05$, in GCs than in the Galactic field ($q=-0.48 \pm 0.04$), suggesting a different formation or evolutionary history of MSPs in these two regions of the Galaxy. To probe the production mechanism of MSPs in clusters, a search of the possible relationships between the MSP population and cluster properties was carried out. The results of an investigation of 9 GCs indicate positive correlations between the MSP population and the stellar encounter rate and metallicity. This provides additional evidence suggesting that stellar dynamical interactions are important in the formation of the MSP population in GCs.

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