Hostname: page-component-586b7cd67f-tf8b9 Total loading time: 0 Render date: 2024-11-29T03:30:51.412Z Has data issue: false hasContentIssue false

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

Published online by Cambridge University Press:  12 September 2016

H. Alyson Ford
Affiliation:
National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944, United States email: [email protected]
Joel N. Bregman
Affiliation:
Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, United States email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Type
Poster Papers
Copyright
Copyright © International Astronomical Union 2016 

References

Bregman, J. N. 2007 ARAA, 45, 221 Google Scholar
Tumlinson, J., Thom, C., Werk, J. K., Prochaska, J. X., Tripp, T. M., Katz, N., Davé, R., Oppenheimer, B. D., Meiring, J. D., Ford, A. B., O'Meara, J. M., Peeples, M. S., Sembach, K. R., Weinberg, D. H. 2013 ApJ, 777, 59 Google Scholar
Werk, J. K., Prochaska, J. X., Tumlinson, J., Peeples, M. S., Tripp, T. M., Fox, A. J., Lehner, N., Thom, C., O'Meara, J. M., Ford, A. B., Bordoloi, R., Katz, N., Tejos, N., Oppenheimer, B. D., Davé, R., Weinberg, D. H. 2014 ApJ, 792, 8 CrossRefGoogle Scholar