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2013MNRAS.436.3135E
Massive star formation in galaxies with excess ultraviolet emission
Erroz-Ferrer, Santiago ( Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain; ); Knapen, Johan H. ( Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Spain; Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Spain ); Mohd Noh Velastín, Elena A. N. ( School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK ); Ryon, Jenna E. ( Department of Astronomy, University of Wisconsin-Madison, 475 N Charter St., Madison, WI 53706, USA; The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA ); Hagen, Lea M. Z. ( The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA; Department of Astronomy & Astrophysics, The Pennsylvania State University, 525 Davey Laboratory, University Park, PA 16802, USA; Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA ) show affiliations
Monthly Notices of the Royal Astronomical Society, Volume 436, Issue 4, p.3135-3146
Published in Dec 2013
From an analysis of almost 2000 Galaxy Evolution Explorer images of galaxies with morphological types ranging from E to Sab, we have found a significant subset (28 per cent) that show ultraviolet (UV) emission outside R25. We have obtained Hα imaging of 10 such galaxies, and found that their star formation rates are similar in the UV and in Hα, with values ranging from a few tenths to a few M yr-1. Probably because our sample selection is biased towards star-forming galaxies, these rates are comparable to those found in disc galaxies, although the star formation rates of the elliptical galaxies in our sample are well below 1 M yr-1. We confirm that the extended UV emission in our sample is caused by massive star formation in outer spiral arms and/or outer (pseudo) rings, rather than by alternative mechanisms such as the UV upturn.
Keywords:
Free Keywords: Astrophysics - Cosmology and Extragalactic Astrophysics; cD; galaxies: elliptical and lenticular; galaxies: spiral; galaxies: star formation; galaxies: structure; ultraviolet: galaxies
Astronomy: cD; galaxies: elliptical and lenticular; galaxies: spiral; galaxies: star formation; galaxies: structure; ultraviolet: galaxies
arXiv: Astrophysics - Cosmology and Extragalactic Astrophysics
2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
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