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The Wsrt Halogas Survey

Published online by Cambridge University Press:  09 February 2015

George Heald  and
the HALOGAS Team
George Heald
Affiliation:
ASTRON, Postbus 2, 7990 AA Dwingeloo, The Netherlands Kapteyn Astronomical Institute, Postbus 800, 9700 AV, Groningen, The Netherlands email: heald@astron.nl
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Abstract

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We present an overview of the HALOGAS (Hydrogen Accretion in LOcal GAlaxieS) Survey, which is the deepest systematic investigation of cold gas accretion in nearby spiral galaxies to date. Using the deep H i data that form the core of the survey, we are able to detect neutral hydrogen down to a typical column density limit of about 1019 cm−2 and thereby characterize the low surface brightness extra-planar and anomalous-velocity neutral gas in nearby galaxies with excellent spatial and velocity resolution. Through comparison with sophisticated kinematic modeling, our 3D HALOGAS data also allow us to investigate the disk structure and dynamics in unprecedented detail for a sample of this size. Key scientific results from HALOGAS include new insight into the connection between the star formation properties of galaxies and their extended gaseous media, while the developing HALOGAS catalogue of cold gas clouds and streams provides important insight into the accretion history of nearby spirals. We conclude by motivating some of the unresolved questions to be addressed using forthcoming 3D surveys with the modern generation of radio telescopes.

Keywords

galaxies: spiral — galaxies: evolution — galaxies: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Issue S309: Galaxies in 3D across the Universe , July 2014 , pp. 69 - 72
Copyright
Copyright © International Astronomical Union 2015 

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