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Published November 20, 2016 | Published + Submitted
Journal Article Open

The SAMI Galaxy Survey: Galaxy Interactions and Kinematic Anomalies in Abell 119

Abstract

Galaxy mergers are important events that can determine the fate of a galaxy by changing its morphology, star formation activity and mass growth. Merger systems have commonly been identified from their disturbed morphologies, and we now can employ integral field spectroscopy to detect and analyze the impact of mergers on stellar kinematics as well. We visually classified galaxy morphology using deep images (µ_r = 28 mag arcsec^(-2)) taken by the Blanco 4 m telescope at the Cerro Tololo Inter-American Observatory. In this paper we investigate 63 bright (M_r < -19.3) spectroscopically selected galaxies in Abell 119, of which 53 are early type and 20 show a disturbed morphology by visual inspection. A misalignment between the major axes in the photometric image and the kinematic map is conspicuous in morphologically disturbed galaxies. Our sample is dominated by early-type galaxies, yet it shows a surprisingly tight Tully–Fisher relation except for the morphologically disturbed galaxies which show large deviations. Three out of the eight slow rotators in our sample are morphologically disturbed. The morphologically disturbed galaxies are generally more asymmetric, visually as well as kinematically. Our findings suggest that galaxy interactions, including mergers and perhaps fly-bys, play an important role in determining the orientation and magnitude of a galaxy's angular momentum.

Additional Information

© 2016 The American Astronomical Society. Received 2016 June 3; revised 2016 September 5; accepted 2016 September 7; published 2016 November 17. The SAMI Galaxy Survey is based on observations made at the Anglo-Australian Telescope. The Sydney-AAO Multi-object Integral field spectrograph (SAMI) was developed jointly by the University of Sydney and the Australian Astronomical Observatory. The SAMI input catalog is based on data taken from the Sloan Digital Sky Survey, the GAMA Survey and the VST ATLAS Survey. The SAMI Galaxy Survey is funded by the Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO), through project number CE110001020, and other participating institutions. The SAMI Galaxy Survey website is http://sami-survey.org/. S.O. thanks D.W.L. for his continued support. SKY acknowledges support from the Korean National Research Foundation (NRF-2014R1A2A1A01003730). S.M.C. acknowledges the support of an Australian Research Council Future Fellowship (FT100100457). J.T.A. acknowledges the award of a SIEF John Stocker Fellowship. M.S.O. acknowledges the funding support from the Australian Research Council through a Future Fellowship Fellowship (FT140100255). JvdS is funded under Bland-Hawthorn's ARC Laureate Fellowship (FL140100278). S.B. acknowledges the funding support from the Australian Research Council through a Future Fellowship (FT140101166). Mahajan acknowledges the funding support from the INSPIRE Faculty award (DST/INSPIRE/04/2015/002311) and the Fast track fellowship (SB/FTP/PS-054/2013) from the Department of Science and Technology (DST) and the Science Education and Research Board (SERB), respectively. NS acknowledges support of a University of Sydney Postdoctoral Research Fellowship. H.J. acknowledges support from the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education (NRF-2013R1A6A3A04064993). Support for A.M.M. is provided by NASA through Hubble Fellowship grant #HST-HF2-51377 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. This work has been supported by the Yonsei University Future-leading Research Initiative of 2015 (RMS2 2015-22-0064).

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Published - Oh_2016_ApJ_832_69.pdf

Submitted - 1609.03595v1.pdf

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August 22, 2023
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