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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28389

Title: Setting the normalcy level of HI properties in isolated galaxies
Authors: Espada, D.
Verdes-Montenegro, L.
Athanassoula, E.
Bosma, A.
Huchtmeier, W. K.
Leon, S.
Lisenfeld, Ute
Sabater, J.
Sulentic, J.
Verley, S.
Yun, M. S.
Issue Date: 2009
Abstract: Studying the atomic gas (HI) properties of the most isolated galaxies is essential to quantify the effect that the environment exerts on this sensitive component of the interstellar medium. We observed and compiled HI data for a well defined sample of ~ 800 galaxies in the Catalog of Isolated Galaxies, as part of the AMIGA project (Analysis of the ISM in Isolated GAlaxies, this http URL), which enlarges considerably previous samples used to quantify the HI deficiency in galaxies located in denser environments. By studying the shape of 182 HI profiles, we revisited the usually accepted result that, independently of the environment, more than half of the galaxies present a perturbed HI disk. In isolated galaxies this would certainly be a striking result if these are supposed to be the most relaxed systems, and has implications in the relaxation time scales of HI disks and the nature of the most frequent perturbing mechanisms in galaxies. Our sample likely exhibits the lowest HI asymmetry level in the local Universe. We found that other field samples present an excess of ~ 20% more asymmetric HI profiles than that in CIG. Still a small percentage of galaxies in our sample present large asymmetries. Follow-up high resolution VLA maps give insight into the origin of such asymmetries.
Sponsorship: This work has been partially supported by Spanish DGI grant AYA2008-06181-C02, as well as Junta de Andalucia (Spain) grants P08-FQM-4205-PEX and TIC-114 16-C02-01. DE is supported by the Marie Curie International fellowship MOIF-CT-2006-40298.
Publisher: Astronomical Society fo the Pacific
Description: International conference “Galaxies in Isolation: Exploring Nature vs. Nurture” held in Granada (Spain), May 12–15, 2009.
Series/Report no.: Conference Series;421
Keywords: AMIGA (Analysis of the interstellar Medium of Isolated Galaxies)
Isolated
Galaxies
Atomic gas (HI)
URI: http://hdl.handle.net/10481/28389
ISBN: 978-1-58381-722-3
978-1-58381-723-0
ISSN: 1050-3390
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Espada, D.; et al. Setting the normalcy level of HI properties in isolated galaxies. In: Verdes-Montenegro, L; Olmo, A. y Sulentic, J. (eds.) Galaxies in Isolation: exploring nature vresus nuture. San Francisco (USA): Astronomical Society of the Pacific, 2010. p. 41. (Conference Series, 421). [http://hdl.handle.net/10481/28389]
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