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Dynamical Modeling of Galaxy Mergers Using Identikit

Privon, G. C. and Barnes, J. E. and Evans, A. S. and Hibbard, J. E. and Yun, M. S. and Mazzarella, J. M. and Armus, L. and Surace, J. (2013) Dynamical Modeling of Galaxy Mergers Using Identikit. Astrophysical Journal, 771 (2). Art. No. 120. ISSN 0004-637X. doi:10.1088/0004-637X/771/2/120.

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We present dynamical models of four interacting systems: NGC 5257/8, The Mice, the Antennae, and NGC 2623. The parameter space of the encounters are constrained using the Identikit model-matching and visualization tool. Identikit utilizes hybrid N-body and test particle simulations to enable rapid exploration of the parameter space of galaxy mergers. The Identikit-derived matches of these systems are reproduced with self-consistent collisionless simulations which show very similar results. The models generally reproduce the observed morphology and H I kinematics of the tidal tails in these systems with reasonable properties inferred for the progenitor galaxies. The models presented here are the first to appear in the literature for NGC 5257/8 and NGC 2623, and The Mice and the Antennae are compared with previously published models. Based on the assumed mass model and our derived initial conditions, the models indicate that the four systems are currently being viewed 175-260 Myr after first passage and cover a wide range of merger stages. In some instances there are mismatches between the models and the data (e.g., in the length of a tail); these are likely due to our adoption of a single mass model for all galaxies. Despite the use of a single mass model, these results demonstrate the utility of Identikit in constraining the parameter space for galaxy mergers when applied to real data.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Privon, G. C.0000-0003-3474-1125
Evans, A. S.0000-0003-2638-1334
Yun, M. S.0000-0001-7095-7543
Mazzarella, J. M.0000-0002-8204-8619
Armus, L.0000-0003-3498-2973
Surace, J.0000-0001-7291-0087
Additional Information:© 2013 American Astronomical Society. Received 2013 February 12; accepted 2013 May 7; published 2013 June 24. The authors thank Francois Schweizer for helpful comments on the manuscript. The authors also thank the anonymous referee for useful comments. G.C.P. and A.S.E. were supported by NSF grants AST 1109475 and 02-06262, and by NASA through grants HST-GO10592.01-A and HST-GO11196.01-A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of NASA’s Astrophysics Data System. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:galaxies: individual (NGC 5257, NGC 5258, The Mice, Antennae, NGC 2623); galaxies: interactions; galaxies: kinematics and dynamics
Issue or Number:2
Record Number:CaltechAUTHORS:20130809-102242916
Persistent URL:
Official Citation:Dynamical Modeling of Galaxy Mergers Using Identikit G. C. Privon et al. 2013 ApJ 771 120
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39834
Deposited By: Jason Perez
Deposited On:12 Aug 2013 14:34
Last Modified:09 Nov 2021 23:47

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