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Matching Globular Cluster Models to Observations

Rui, Nicholas Z. and Kremer, Kyle and Weatherford, Newlin C. and Chatterjee, Sourav and Rasio, Frederic A. and Rodriguez, Carl L. and Ye, Claire S. (2021) Matching Globular Cluster Models to Observations. Astrophysical Journal, 912 (2). Art. No. 102. ISSN 1538-4357. doi:10.3847/1538-4357/abed49.

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As ancient, gravitationally bound stellar populations, globular clusters represent abundant, vibrant laboratories, characterized by high frequencies of dynamical interactions, coupled to complex stellar evolution. Using surface brightness and velocity dispersion profiles from the literature, we fit 59 Milky Way globular clusters to dynamical models from the CMC Cluster Catalog. Without performing any interpolation, and without any directed effort to fit any particular cluster, 26 globular clusters are well matched by at least one of our models. We discuss in particular the core-collapsed clusters NGC 6293, NGC 6397, NGC 6681, and NGC 6624, and the non-core-collapsed clusters NGC 288, NGC 4372, and NGC 5897. As NGC 6624 lacks well-fitting snapshots on the main CMC Cluster Catalog, we run six additional models in order to refine the fit. We calculate metrics for mass segregation, explore the production of compact object sources such as millisecond pulsars, cataclysmic variables, low-mass X-ray binaries, and stellar-mass black holes, finding reasonable agreement with observations. In addition, closely mimicking observational cuts, we extract the binary fraction from our models, finding good agreement, except in the dense core regions of core-collapsed clusters. Accompanying this paper are a number of python methods for examining the publicly accessible CMC Cluster Catalog, as well as any other models generated using CMC.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Rui, Nicholas Z.0000-0002-1884-3992
Kremer, Kyle0000-0002-4086-3180
Weatherford, Newlin C.0000-0002-9660-9085
Chatterjee, Sourav0000-0002-3680-2684
Rasio, Frederic A.0000-0002-7132-418X
Rodriguez, Carl L.0000-0003-4175-8881
Ye, Claire S.0000-0001-9582-881X
Additional Information:© 2021. The American Astronomical Society. Received 2021 January 21; revised 2021 March 5; accepted 2021 March 8; published 2021 May 10. We thank L. Clifton Johnson for invaluable discussions and advice, and the anonymous referee for their useful suggestions. This work was supported by NSF grant AST-1716762, and by the computational resources and staff contributions provided for the Quest high-performance computing facility at Northwestern University. N.Z.R. acknowledges support from the Illinois Space Grant Consortium, and the Dominic Orr Graduate Fellowship. K.K. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award No. AST-2001751. N.C.W. acknowledges support from the CIERA Riedel Graduate Fellowship at Northwestern University, as well as the NSF GK-12 Fellowship Program under grant No. DGE-0948017. S.C. acknowledges support from the Department of Atomic Energy, Government of India, under project no. 12-R&D-TFR-5.02-0200. This research has made use of the SVO Filter Profile Service ( supported from the Spanish MINECO through grant AYA2017-84089. Software: Astropy (The Astropy Collaboration 2013), IPython (Pérez & Granger 2007), Matplotlib (Hunter 2007), NumPy (Oliphant 2006; Harris et al. 2020), SciPy (Jones et al. 2006; Virtanen et al. 2020), Pandas (McKinney 2010), Cluster Monte Carlo (Pattabiraman & Umbreit 2013), cmctoolkit (Rui et al. 2021), cosmic (Breivik et al. 2020), fewbody (Fregeau et al. 2004).
Funding AgencyGrant Number
Northwestern UniversityUNSPECIFIED
Illinois Space Grant ConsortiumUNSPECIFIED
Dominic Orr Graduate FellowshipUNSPECIFIED
NSF Astronomy and Astrophysics FellowshipAST-2001751
Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA)UNSPECIFIED
NSF Graduate Research FellowshipDGE-0948017
Department of Atomic Energy (India)12-R&D-TFR-5.02-0200
Ministerio de Economía, Industria y Competitividad (MINECO)AyA2017-84089
Subject Keywords:Globular star clusters; Computational methods; Cataclysmic variable stars; X-ray binary stars; Binary stars; Stellar-mass black holes; Stellar dynamics
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Globular star clusters (656); Computational methods (1965); Cataclysmic variable stars (203); X-ray binary stars (1811); Binary stars (154); Stellar-mass black holes (1611); Stellar dynamics (1596)
Record Number:CaltechAUTHORS:20210511-122712385
Persistent URL:
Official Citation:Nicholas Z. Rui et al 2021 ApJ 912 102
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109080
Deposited By: Tony Diaz
Deposited On:11 May 2021 20:31
Last Modified:14 May 2021 18:04

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