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Title: DYNAMICAL FORMATION OF MILLISECOND PULSARS IN GLOBULAR CLUSTERS

Abstract

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 {proportional_to} L{sup 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 {+-} 0.05, in GCs than in the Galactic field (q = -0.48 {+-} 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 nine 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.

Authors:
 [1];  [2];  [3]
  1. Department of Astronomy and Space Science, Chungnam National University, Daejeon (Korea, Republic of)
  2. Department of Physics, University of Hong Kong, Pokfulam Road (Hong Kong)
  3. Department of Physics and Astronomy, Northwestern University, 2131 Tech Drive, Evanston, IL 60208 (United States)
Publication Date:
OSTI Identifier:
21448848
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 714; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/714/2/1149; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CORRELATIONS; DISTRIBUTION FUNCTIONS; GALAXIES; LUMINOSITY; PULSARS; COSMIC RADIO SOURCES; FUNCTIONS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES

Citation Formats

Hui, C Y, Cheng, K S, and Taam, Ronald E. DYNAMICAL FORMATION OF MILLISECOND PULSARS IN GLOBULAR CLUSTERS. United States: N. p., 2010. Web. doi:10.1088/0004-637X/714/2/1149.
Hui, C Y, Cheng, K S, & Taam, Ronald E. DYNAMICAL FORMATION OF MILLISECOND PULSARS IN GLOBULAR CLUSTERS. United States. https://doi.org/10.1088/0004-637X/714/2/1149
Hui, C Y, Cheng, K S, and Taam, Ronald E. Mon . "DYNAMICAL FORMATION OF MILLISECOND PULSARS IN GLOBULAR CLUSTERS". United States. https://doi.org/10.1088/0004-637X/714/2/1149.
@article{osti_21448848,
title = {DYNAMICAL FORMATION OF MILLISECOND PULSARS IN GLOBULAR CLUSTERS},
author = {Hui, C Y and Cheng, K S and Taam, Ronald E},
abstractNote = {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 {proportional_to} L{sup 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 {+-} 0.05, in GCs than in the Galactic field (q = -0.48 {+-} 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 nine 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.},
doi = {10.1088/0004-637X/714/2/1149},
url = {https://www.osti.gov/biblio/21448848}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 714,
place = {United States},
year = {2010},
month = {5}
}