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A Green Bank Telescope Search for Highly Extended HI Disks Around Spiral Galaxies

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

H. Alyson Ford  and
Joel N. Bregman
H. Alyson Ford
Affiliation:
National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944, United States email: aford@nrao.edu
Joel N. Bregman
Affiliation:
Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, United States email: jbregman@umich.edu
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Abstract

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Recent UV absorption line studies suggest that a large fraction of missing baryons are in the warm ionized and neutral phases, with about half of Milky Way-mass galaxies containing absorption systems with HI column densities of 1018 cm−2 or greater. This HI gas, which would have been difficult to detect with previous instruments, could be a significant contributor to the missing baryons. The Green Bank Telescope (GBT) presents a unique opportunity to detect this emission. We present results from GBT 21 cm observations of a sample of ten nearby optically luminous spirals, which reveal extended HI gas in half of our sample. The column densities of this extended HI are typically ~ 1 × 1019 cm−2, as measured at distances of 100 kpc from the center of the galaxies.

Keywords

galaxies: spiralgalaxies: structuregalaxies: ISMgalaxies: halos
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , E21
Copyright
Copyright © International Astronomical Union 2016 

References

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