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The Void Galaxy Survey: Galaxy Evolution and Gas Accretion in Voids

Published online by Cambridge University Press:  12 October 2016

Kathryn Kreckel ,
Jacqueline H. van Gorkom ,
Burcu Beygu ,
Rien van de Weygaert ,
J. M. van der Hulst ,
Miguel A. Aragon-Calvo  and
Reynier F. Peletier
Kathryn Kreckel
Affiliation:
MPIA, Königstuhl 17, 69117 Heidelberg, Germany email: [email protected]
Jacqueline H. van Gorkom
Affiliation:
Columbia University, MC 5246, 550 W120th St., New York, NY 10027, USA
Burcu Beygu
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
Rien van de Weygaert
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
J. M. van der Hulst
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
Miguel A. Aragon-Calvo
Affiliation:
University of California, Riverside, CA 92521, USA
Reynier F. Peletier
Affiliation:
Kapteyn Astronomical Institute, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands
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Abstract

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Voids represent a unique environment for the study of galaxy evolution, as the lower density environment is expected to result in shorter merger histories and slower evolution of galaxies. This provides an ideal opportunity to test theories of galaxy formation and evolution. Imaging of the neutral hydrogen, central in both driving and regulating star formation, directly traces the gas reservoir and can reveal interactions and signs of cold gas accretion. For a new Void Galaxy Survey (VGS), we have carefully selected a sample of 59 galaxies that reside in the deepest underdensities of geometrically identified voids within the SDSS at distances of ∼100 Mpc, and pursued deep UV, optical, Hα, IR, and HI imaging to study in detail the morphology and kinematics of both the stellar and gaseous components. This sample allows us to not only examine the global statistical properties of void galaxies, but also to explore the details of the dynamical properties. We present an overview of the VGS, and highlight key results on the HI content and individually interesting systems. In general, we find that the void galaxies are gas rich, low luminosity, blue disk galaxies, with optical and HI properties that are not unusual for their luminosity and morphology. We see evidence of both ongoing assembly, through the gas dynamics between interacting systems, and significant gas accretion, seen in extended gas disks and kinematic misalignments. The VGS establishes a local reference sample to be used in future HI surveys (CHILES, DINGO, LADUMA) that will directly observe the HI evolution of void galaxies over cosmic time.

Keywords

large-scale structure of universegalaxies: evolutiongalaxies: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S308: The Zeldovich Universe: Genesis and Growth of the Cosmic Web , June 2014 , pp. 591 - 599
Copyright
Copyright © International Astronomical Union 2016 

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