Publication: Discovery of a galactic wind in the central region of M100
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2007-11-21
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Wiley
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Abstract
We report the discovery of a galactic wind in the central region of the galaxy M100. This result is based on a careful 2D spectroscopic study performed on observations made with the fibre system INTEGRAL on the William Herschel Telescope. The primary evidence of the wind is the presence of blueshifted interstellar NaD absorption lines. The velocity field of the absorbers show a clear rotation pattern but which is globally blueshifted (similar to -115 km s(-1)) with respect to the systemic velocity of the galaxy. The emission lines also present a blueward component arising from the ionized gas phase of the galactic wind. The velocity field of the ionized gas wind component shows no evidence of rotation but exhibits a pattern that can be interpreted in terms of the projection of an outflowing cone or shell. The wind component has [N II]/H alpha ratios of about 1.8, typical of shock ionization. The ionized component of the wind can be identified with an expanding shell of shocked gas, and the neutral component with disc gas entrained in the wind at the interface of the expanding shell with the galactic interstellar medium. The galactic wind seems to be driven uniquely by the nuclear starburst. Our analysis indicates that a non-negligible fraction of the wind material might escape to the intergalactic medium (IGM). In this case, if the wind detected in M100 were representative of similar phenomena in other galaxies with low to moderate activity, the current estimates of metal and dust content of the IGM might be drastically underestimated.
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This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. © 2007 The Authors. Journal compilation © 2007 RAS. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. This paper has been supported by the Secretaría de Estado de Política Científica y Tecnológica (AYA2004-08251-C02-02, ESP2004-06870-C02-02, AYA2006-02358). This research has made use of NED which is operated by the JPL, Caltech, under contract with NASA. We have used observations made with the NASA/ESA HST, obtained from the data archive at the STScI. JJV acknowledges support from the Consejería de Educación y Ciencia de la Junta de Andalucía. A.C.M. acknowledges the support from the Ministerio de Educación y Ciencia. We also acknowledge the support of the RTN Euro3D: Promoting 3D spectroscopy in Europe. We are grateful to the anonymous referee for valuable comments that have helped to improve the quality of the paper.
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