Stellar Motions in the Polar Ring Galaxy NGC 4650A

Abstract

We present the first measurement of the stellar kinematics in the polar ring of NGC 4650A. There is well defined rotation, with the stars and gas rotating in the same direction, and with similar amplitude. The gaseous and stellar kinematics suggest an approximately flat rotation curve, providing further support for the hypothesis that the polar material resides in a disk rather than in a ring. The kinematics of the emission line gas at and near the center of the S0 suggests that the polar disk lacks a central hole. We have not detected evidence for two, equal mass, counterrotating stellar polar streams, as is predicted in the resonance levitation model proposed by Tremaine & Yu. A merger seems the most likely explanation for the structure and kinematics of NGC 4650A.

arXiv comment4 pages, accepted for publication in ApJ Letters

References in corpus (4)

• The Flattened Dark Halo of Polar Ring Galaxy NGC 4650A: A Conspiracy of Shapes?
• Formation of a polar-ring galaxy in a galaxy merger
• The puzzle of the polar structure in NGC 4650A
• Resonant capture, counter-rotating disks, and polar rings

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• Spectral decomposition of the stellar kinematics in the polar disk galaxy NGC 4650A
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• Chemical abundances of the PRGs UGC7576 and UGC9796. I. Testing the formation scenario
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• On stability and spiral patterns in polar disks
• Surface Photometry and Metallicity of the Polar Ring Galaxy A0136-0801
• COUGS-DESI: A Catalog of Unusual Galaxies with Polar Structures in the DESI Legacy Imaging Surveys