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A Novel Method to Automatically Detect and Measure the Ages of Star Clusters in Nearby Galaxies: Application to the Large Magellanic Cloud

SYSNO ASEP	0478549
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	A Novel Method to Automatically Detect and Measure the Ages of Star Clusters in Nearby Galaxies: Application to the Large Magellanic Cloud
Author(s)	Bitsakis, J. (MX) Bonfini, P. (MX) Gonzalez-Lopezlira, R.A. (MX) Ramirez-Siordia, V.H. (MX) Bruzual, G. (MX) Charlot, S. (FR) Maravelias, Grigorios (ASU-R)_ORCID Zaritsky, D. (US)
Source Title	Astrophysical Journal - ISSN 0004-637X Roč. 845, č. 1 (2017), 56/1-56/12
Number of pages	12 s.
Publication form	Print - P
Language	eng - English
Country	US - United States
Keywords	catalogs ; star clusters ; Magellanic Clouds
Subject RIV	BN - Astronomy, Celestial Mechanics, Astrophysics
OECD category	Astronomy (including astrophysics,space science)
R&D Projects	GA14-21373S GA ČR - Czech Science Foundation (CSF)
Institutional support	ASU-R - RVO:67985815
UT WOS	000407462000015
EID SCOPUS	85028314763
DOI	10.3847/1538-4357/aa8090
Annotation	e present our new, fully automated method to detect and measure the ages of star clusters in nearby galaxies, where individual stars can be resolved. The method relies purely on statistical analysis of observations and Monte-Carlo simulations to define stellar overdensities in the data. It decontaminates the cluster color-magnitude diagrams and, using a revised version of the Bayesian isochrone fitting code of Ramirez-Siordia et al., estimates the ages of the clusters. Comparisons of our estimates with those from other surveys show the superiority of our method to extract and measure the ages of star clusters, even in the most crowded fields. An application of our method is shown for the high-resolution, multiband imaging of the Large Magellanic Cloud. We detect 4850 clusters in the 7 deg(2) we surveyed, 3451 of which have not been reported before. Our findings suggest multiple epochs of star cluster formation, with the most probable occurring similar to 310 Myr ago. Several of these events are consistent with the epochs of the interactions among the Large and Small Magellanic Clouds, and the Galaxy, as predicted by N-body numerical simulations. Finally, the spatially resolved star cluster formation history may suggest an inside-out cluster formation scenario throughout the LMC, for the past 1 Gyr.
Workplace	Astronomical Institute
Contact	Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
Year of Publishing	2018

Number of the records: 1