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The Nuclear Ring in the Barred Spiral Galaxy IC 4933

Published online by Cambridge University Press:  02 January 2013

Stuart D. Ryder ,
Samuel M. Illingworth ,
Robert G. Sharp  and
Catherine L. Farage
Stuart D. Ryder*
Affiliation:
Anglo–Australian Observatory, PO Box 296, Epping, NSW 1710
Samuel M. Illingworth
Affiliation:
Department of Physics & Astronomy, University of Leicester, Leicester, LE1 7RH, UK
Robert G. Sharp
Affiliation:
Anglo–Australian Observatory, PO Box 296, Epping, NSW 1710
Catherine L. Farage
Affiliation:
Research School of Astronomy and Astrophysics, Australian National University, ACT 2611
*
DCorresponding author. Email: [email protected]
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Abstract

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We present infrared imaging from IRIS2 on the Anglo–Australian Telescope that shows the barred spiral galaxy IC 4933 has not just an inner ring encircling the bar, but also a star-forming nuclear ring 1.5 kpc in diameter. Imaging in the u′ band with GMOS on Gemini South confirms that this ring is not purely an artifact due to dust. Optical and near-infrared colours alone however cannot break the degeneracy between age, extinction, and burst duration that would allow the star formation history of the ring to be unraveled. Integral field spectroscopy with the GNIRS spectrograph on Gemini South shows the equivalent width of the Paβ line to peak in the north and south quadrants of the ring, indicative of a bipolar azimuthal age gradient around the ring. The youngest star-forming regions do not appear to correspond to where we expect to find the contact points between the offset dust lanes and the nuclear ring unless the nuclear ring is oval in shape, causing the contact points to lead the bar by more than 90°.

Keywords

galaxies: evolutiongalaxies: individual (IC 4933)galaxies: nucleigalaxies: starburststars: formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 27 , Issue 1 , 2010 , pp. 56 - 63
Copyright
Copyright © Astronomical Society of Australia 2010

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