Journal Article

Evidence of an interaction from resolved stellar populations: the curious case of NGC 1313

E. Silva-Villa and S. S. Larsen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 423, issue 1, pages 213-221
Published in print June 2012 | ISSN: 0035-8711
Published online May 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20797.x
Evidence of an interaction from resolved stellar populations: the curious case of NGC 1313

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The galaxy NGC 1313 has attracted the attention of various studies due to the peculiar morphology observed in optical bands, although it is classified as a barred, late-type galaxy with no apparent close-by companions. However, the velocity field suggests an interaction with a satellite companion. Using resolved stellar populations, we study different parts of the galaxy to understand further its morphology. Based on Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) images, we estimated star formation histories by means of the synthetic colour–magnitude diagram method in different areas in the galaxy. Incompleteness limits our analysis to ages younger than ∼100 Myr. Stars in the red and blue He-burning phases are used to trace the distribution of recent star formation. Star formation histories suggest a burst in the south-western region. We support the idea that NGC 1313 is experiencing an interaction with a satellite companion, observed as a tidally disrupted satellite galaxy in the south-west of NGC 1313. However, we do not observe any indication of a perturbation due to the interaction with the satellite galaxy at other locations across the galaxy, suggesting that only a modest-sized companion that did not trigger a global starburst was involved.

Keywords: galaxies: evolution; galaxies: individual: NGC 1313; galaxies: interactions; galaxies: photometry; galaxies: star formation

Journal Article.  5981 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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