II Zwicky 23 and family: a group in interaction

Wehner, Elizabeth M. H., Gallagher III, John S., Cigan, Phillip and Rudie, Gwen C. 2016. II Zwicky 23 and family: a group in interaction. The Astronomical Journal 152 (3) , 69. 10.3847/0004-6256/152/3/69

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Abstract

II Zw 23 (UGC 3179) is a luminous (M B ~ −21) nearby compact narrow emission line starburst galaxy with blue optical colors and strong emission lines. We present a photometric and morphological study of II Zw 23 and its interacting companion, KPG103a, using data obtained with the WIYN 3.5 m telescope in combination with a WFPC2 image from the Hubble Space Telescope archives. II Zw 23 has a highly disturbed outer structure with long trails of debris that may be contributing material toward the production of tidal dwarfs. Its central regions appear disky, a structure that is consistent with the overall rotation pattern observed in the Hα velocity field measured from Densepak observations obtained with WIYN. We find additional evidence for interaction in this system, including the discovery of a new tidal loop extending from an associated dwarf galaxy, which appears to be in the process of disrupting along its orbit. We also present Hα equivalent widths and discuss the relative star formation rates across this interacting system.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	IOP Publishing
ISSN:	15383881
Date of First Compliant Deposit:	6 September 2017
Date of Acceptance:	3 June 2016
Last Modified:	04 May 2023 09:07
URI:	https://orca.cardiff.ac.uk/id/eprint/104371

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