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IC 3418: Star formation in a turbulent wake

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Hester, Janice A. and Seibert, Mark and Neill, James D. and Wyder, Ted K. and Gil de Paz, Armando and Madore, Barry F. and Martin, D. Christopher and Schiminovich, David and Rich, R. Michael (2010) IC 3418: Star formation in a turbulent wake. Astrophysical journal letters, 716 (1). L14-L18. ISSN 2041-8205

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Official URL: http://dx.doi.org/10.1088/2041-8205/716/1/L14


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Abstract

Galaxy Evolution Explorer observations of IC 3418, a low surface brightness galaxy in the Virgo Cluster, revealed a striking 17 kpc UV tail of bright knots and diffuse emission. Hα imaging confirms that star formation is ongoing in the tail. IC 3418 was likely recently ram pressure stripped on its first pass through Virgo. We suggest that star formation is occurring in molecular clouds that formed in IC 3418's turbulent stripped wake. Tides and ram pressure stripping (RPS) of molecular clouds are both disfavored as tail formation mechanisms. The tail is similar to the few other observed star-forming tails, all of which likely formed during RPS. The tails' morphologies reflect the forces present during their formation and can be used to test for dynamical coupling between molecular and diffuse gas, thereby probing the origin of the star-forming molecular gas.


Item Type:Article
Additional Information:

© 2010. The American Astronomical Society. All rights reserved. This research has made use of the GOLD Mine Database of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The authors thank L. Cortese for helpful comments.

Uncontrolled Keywords:Virgo cluster; Ram-pressure; Surface photometry; Spiral galaxies; Formation law; H-alpha; Formation rates; Local universe; Galactic disks; Gas
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:35511
Deposited On:04 Feb 2016 12:57
Last Modified:10 Dec 2018 15:05

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