Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/36530
Title: THE TWO-DIMENSIONAL PROJECTED SPATIAL DISTRIBUTION OF GLOBULAR CLUSTERS. I. METHOD AND APPLICATION TO NGC 4261
Authors: D'Abrusco, R.
Fabbiano, G.
Strader, J.
Zezas, A.
Mineo, S. R.
Fragos, T.
Bonfini, P.
Luo, B.
Kim, D-W.
King, Andrew Robert
First Published: 29-Jul-2013
Publisher: IOP Publishing LTD
Citation: Astrophysical Journal, 2013, 773 (2), 87
Abstract: We present a new method for the determination of the two-dimensional (2D) projected spatial distribution of globular clusters (GCs) in external galaxies. This method is based on the K-Nearest Neighbor density estimator of Dressler, complemented by Monte-Carlo simulations to establish the statistical significance of the results. We apply this method to NGC 4261, a "test galaxy" where significant 2D anisotropy in the GC distribution has been reported. We confirm that the 2D distribution of GC is not azimuthally isotropic. Moreover, we demonstrate that the 2D distribution departures from the average GC radial distribution results in highly significant spiral-like or broken shell features. Overall, the same perturbations are found in "red" and "blue" GCs, but with some differences. In particular, we observe a central feature, roughly aligned with the minor axis of NGC 4261, composed of red and most luminous GCs. Blue and fainter GCs are more frequent at large radial distances and follow the spiral-like features of the overall density structure. These results suggest a complex merging history for NGC 4261.
DOI Link: 10.1088/0004-637X/773/2/87
ISSN: 0004-637X
eISSN: 1538-4357
Links: http://iopscience.iop.org/article/10.1088/0004-637X/773/2/87/meta
http://hdl.handle.net/2381/36530
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2013. The American Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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