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The Kinematics and Morphology of NGC 520: One, Two, or Three Galaxies?

Published online by Cambridge University Press:  12 April 2016

S.A. Stanford  and
M. Balcells
S.A. Stanford
Affiliation:
University of Wisconsin
M. Balcells
Affiliation:
University of Wisconsin

Abstract

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The peculiar galaxy NGC 520 (Arp 157) is often interpreted as an interacting pair of galaxies. The identification of the two bulges and overall morphology of the two galaxies has long been a puzzle which we attempt to solve in this paper. New longslit optical spectroscopy and near-infrared images of NGC 520 are presented. These data suggest that the northwest peak is the bulge of one of two galaxies in the system. The other larger bulge is clearly evident in the K band image in the middle of the dust lane. The stellar radial velocity profile in the central 10” of the larger bulge is consistent with counterrotation seen in the molecular gas component. This kinematic subsystem could be the remains of a merged gas-rich irregular.

Type
IV. Observations of Global Activity due to Interaction
Information
International Astronomical Union Colloquium , Volume 124: Paired and Interacting Galaxies , 1990 , pp. 347 - 351
Copyright
Copyright © NASA 1990

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