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2012MNRAS.426.1185A
Revealing a ring-like cluster complex in a tidal tail of the starburst galaxy NGC 2146
Adamo, A. ( Max Planck Institute for Astronomy, Königstuhl 17 D-69117 Heidelberg, Germany ); Smith, L. J. ( Space Telescope Science Institute and European Space Agency, 3700 San Martin Drive Baltimore, MD 21218 USA ); Gallagher, J. S. ( Department of Astronomy, University of Wisconsin-Madison, 5534 Sterling, 475 North Charter Street Madison, WI 53706 USA ); Bastian, N. ( Excellence Cluster Universe, Boltzmann-Strasse 2 85748 Garching bei München, Germany ); Ryon, J. ( Department of Astronomy, University of Wisconsin-Madison, 5534 Sterling, 475 North Charter Street Madison, WI 53706 USA ); Westmoquette, M. S. ( ESO, Karl-Schwarzschild-Strasse 2 85748 Garching bei München, Germany ); Konstantopoulos, I. S. ( Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park PA 16802 USA ); Zackrisson, E. ( Department of Astronomy, Stockholm University, Oscar Klein Center, AlbaNova Stockholm, SE-106 91 Sweden ); Larsen, S. S. ( Department of Astrophysics/IMAPP, Radboud University Nijmegen, PO Box 9010 6500 GL Nijmegen, the Netherlands ); Silva-Villa, E. ( Département de Physique, de Génie Physique et d'Optique, and Centre de Recherche en Astrophysique du Québec (CRAQ), Université Laval, Québec, QC G1V 0A6 Canada ); Charlton, J. C. ( Department of Astronomy & Astrophysics, The Pennsylvania State University, University Park PA 16802 USA ); Weisz, D. R. ( Department of Astronomy, University of Washington, Box 351580 Seattle, WA 98195 USA ) and 2 coauthors show affiliations
Monthly Notices of the Royal Astronomical Society, Volume 426, Issue 2, pp. 1185-1194.
Published in Oct 2012
We report the discovery of a ring-like cluster complex in the starburst galaxy NGC 2146. The Ruby Ring, so named due to its appearance, shows a clear ring-like distribution of star clusters around a central object. It is located in one of the tidal streams that surround the galaxy. NGC 2146 is part of the Snapshot Hubble U-band Cluster Survey (SHUCS). The WFC3/F336W data have added critical information to the available archival Hubble Space Telescope imaging set of NGC 2146, allowing us to determine ages, masses and extinctions of the clusters in the Ruby Ring. These properties have then been used to investigate the formation of this extraordinary system. We find evidence of a spatial and temporal correlation between the central cluster and the clusters in the ring. The latter are about 4 Myr younger than the central cluster, which has an age of 7 Myr. This result is supported by the Hα emission which is strongly coincident with the ring, and weaker at the position of the central cluster. From the derived total Hα luminosity of the system, we constrain the star formation rate density to be quite high (ΣSFR = 0.47 M yr-1 kpc-2). The Ruby Ring is the product of an intense and localized burst of star formation, similar to the extended cluster complexes observed in M 51 and the Antennae, but more impressive because it is quite isolated. The central cluster contains only 5 per cent of the total stellar mass in the clusters that are determined within the complex. The ring-like morphology, the age spread and the mass ratio support a triggering formation scenario for this complex. We discuss the formation of the Ruby Ring in a 'collect and collapse' framework. The predictions made by this model agree quite well with the estimated bubble radius and expansion velocity produced by the feedback from the central cluster, making the Ruby Ring an interesting case of triggered star formation. Based on observations made with the NASA/ESA Hubble Space Telescope, obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with programme SNAP-12229.
Keywords:
Free Keywords: Astrophysics - Cosmology and Extragalactic Astrophysics; galaxies: individual: NGC 2146; galaxies: star clusters: general; galaxies: star formation; galaxies: starburst
Astronomy: galaxies: individual: NGC 2146; galaxies: star clusters: general; galaxies: star formation; galaxies: starburst
arXiv: Astrophysics - Cosmology and Extragalactic Astrophysics
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