Journal Article

Insight into the evolution of the innermost region of the NGC 1023 Group

D. Bettoni, L. Buson, P. Mazzei and G. Galletta

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 3, pages 2957-2965
Published in print July 2012 | ISSN: 0035-8711
Published online June 2012 | e-ISSN: 1365-2966 | DOI:
Insight into the evolution of the innermost region of the NGC 1023 Group

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The NGC 1023 group is one of the most studied nearby groups. Our aim is to give an insight into the evolution of its innermost region by means of ultraviolet observations and proper models. We use far-ultraviolet and near-ultraviolet GALEX archival data as well as a large set of smoothed particle hydrodynamics simulations with chemo-photometric implementation. From the UV observations we find that several, already known, dwarf galaxies very close to NGC 1023 are also detected in the ultraviolet and two more objects (with no optical counterpart) can be added to the group. Using these data, we construct exhaustive models to account for their formation. We find that the whole spectral energy distribution of NGC 1023 and its global properties are well matched by a simulation that provides a minor merger with a companion system 5 times less massive. The strong interaction phase started 7.7 Gyr ago and the final merger 1.8 Gyr ago.

Keywords: galaxies: groups: individual: NGC 1023; galaxies: individual: NGC 1023; galaxies: structure

Journal Article.  4773 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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