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Synthetic HI observations of spiral structure in the outer disk in galaxies

Part of: Complex Plasma Phenomena

Published online by Cambridge University Press:  11 December 2015

Sergey A. Khoperskov  and
Giuseppe Bertin
Sergey A. Khoperskov*
Affiliation:
Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, I-20133 Milano, Italy Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya st., 48, Moscow 119017, Russia
Giuseppe Bertin
Affiliation:
Dipartimento di Fisica, Università degli Studi di Milano, via Celoria 16, I-20133 Milano, Italy
*
†Email address for correspondence: [email protected]
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Abstract

By means of 3D hydrodynamical simulations, in a separate paper we have discussed the properties of non-axisymmetric density wave trains in the outermost regions of galaxy disks, based on the picture that self-excited global spiral modes in the bright optical stellar disk are accompanied by low-amplitude short trailing wave signals outside corotation; in the gas, such wave trains can penetrate through the outer Lindblad resonance and propagate outwards, forming prominent spiral patterns. In this paper we present the synthetic 21 cm velocity maps expected from simulated models of the outer gaseous disk, focusing on the case when the disk is dominated by a two-armed spiral pattern, but considering also other more complex situations. We discuss some aspects of the spiral pattern in the gaseous periphery of galaxy disks noted in our simulations that might be interesting to compare with specific observed cases.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 6 , December 2015 , 495810607
Copyright
© Cambridge University Press 2015 

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