Journal Article

A candidate polar-ring galaxy in the Subaru Deep Field

Ido Finkelman, Or Graur and Noah Brosch

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 412, issue 1, pages 208-212
Published in print March 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17899.x
A candidate polar-ring galaxy in the Subaru Deep Field

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We discuss the properties of an object in the Subaru Deep Field (SDF) classified as a galaxy in on-line data bases and revealed on the Subaru images as a genuine polar-ring galaxy (PRG) candidate. We analyse available photometric data and conclude that this object consists of a ≳ Gyr old early-type central body surrounded by a faint, narrow inner ring tilted at a ∼25° angle relative to the polar axis of the host galaxy. The halo surrounding the main stellar body exhibits a diversity of spatially extended stellar features of low surface brightness, including a faint asymmetric stellar cloud and two prominent loops. These faint features, together with the unperturbed morphology of the central host, are clear signs of a recent coalescence of two highly unequal mass galaxies, most likely a pre-existing early-type galaxy and a close-by gas-rich dwarf galaxy. The presumed stellar remnants observed near the edges of the ring, including possibly the surviving captured companion itself, indicate that the merger is still taking place.

Keywords: galaxies: individual: SDSS J132533.22+272246.7; galaxies: peculiar; galaxies: photometry

Journal Article.  3118 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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