Skip to main content Accessibility help
×
Home

ALFALFA Hα Reveals How Galaxies Use Their Hi Fuel

Published online by Cambridge University Press:  12 September 2016

Anne Jaskot
Affiliation:
Dept. of Astronomy, Smith College, Northampton, MA 01063, USA email: ajaskot@smith.edu
Sally Oey
Affiliation:
Dept. of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
John Salzer
Affiliation:
Dept. of Astronomy, Indiana University, Bloomington, IN 47405, USA
Angie Van Sistine
Affiliation:
Dept. of Astronomy, Indiana University, Bloomington, IN 47405, USA
Eric Bell
Affiliation:
Dept. of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA
Martha Haynes
Affiliation:
Center for Astrophysics and Planetary Science, Cornell University, Ithaca, NY 14853, USA
Corresponding
E-mail address:
Rights & Permissions[Opens in a new window]

Abstract

Atomic hydrogen traces the raw material from which molecular clouds and stars form. With 565 galaxies from the ALFALFA Hα survey, a statistically complete subset of the ALFALFA survey, we examine the processes that affect galaxies' abilities to access and consume their Hi gas. On galaxy-wide scales, Hi gas fractions correlate only weakly with instantaneous specific star formation rates (sSFRs) but tightly with galaxy color. We show that a connection between dust and Hi content, arising from the fundamental mass-metallicity-Hi relation, leads to this tight color correlation. We find that disk galaxies follow a relation between stellar surface density and Hi depletion time, consistent with a scenario in which higher mid-plane pressure leads to more efficient molecular cloud formation from Hi. In contrast, spheroids show no such trend. Starbursts, identified by Hα equivalent width, do not show enhanced Hi gas fractions relative to similar mass non-starburst galaxies. The starbursts' shorter Hi depletion times indicate more efficient consumption of Hi, and galaxy interactions drive this enhanced star formation efficiency in several starbursts. Interestingly, the most disturbed starbursts show greater enhancements in Hi gas fraction, which may indicate an excess of Hi at early merger stages. At low galaxy stellar masses, the triggering mechanism for starbursts is less clear; the high scatter in efficiency and sSFR among low-mass galaxies may result from periodic bursts. We find no evidence for depleted Hi reservoirs in starbursts, which suggests that galaxies may maintain sufficient Hi to fuel multiple starburst episodes.

Type
Poster Papers
Copyright
Copyright © International Astronomical Union 2016 

References

Blitz, L., & Rosolowsky, E. 2006, ApJ, 650, 933 CrossRefGoogle Scholar
Bothwell, M.S., Maiolino, R., Kennicutt, R., et al. 2013, MNRAS, 433, 1425 CrossRefGoogle Scholar
Calzetti, D., Armus, L., Bohlin, R.C., et al. 2000, ApJ, 533, 682 CrossRefGoogle Scholar
Cardelli, J.A., Clayton, G.C., & Mathis, J. S. 1989, ApJ, 345, 245 CrossRefGoogle Scholar
Catinella, B., Schiminovich, D., Kauffmann, G., et al. 2010, MNRAS, 403, 683 CrossRefGoogle Scholar
Giovanelli, R., Haynes, M.P., Kent, B.R., et al. 2005, AJ, 130, 2598 CrossRefGoogle Scholar
Huang, S., Haynes, M.P., Giovanelli, R., & Brinchmann, J. 2012, ApJ, 756, 113 CrossRefGoogle Scholar
Jaskot, A.E., Oey, M.S., Salzer, J.J., et al. 2015, ApJ, 808, 66 CrossRefGoogle Scholar
Simard, L., Mendel, J.T., Patton, D.R., et al. 2011, ApJS, 196, 11 CrossRefGoogle Scholar
Van Sistine, A., Salzer, J.J., Sugden, A., et al. 2015, ApJ, SubmittedGoogle Scholar
Wen, X.-Q., Wu, H., Zhu, Y.-N., et al. 2014, MNRAS, 438, 97 CrossRefGoogle Scholar

Full text views

Full text views reflects PDF downloads, PDFs sent to Google Drive, Dropbox and Kindle and HTML full text views.

Total number of HTML views: 0
Total number of PDF views: 65 *
View data table for this chart

* Views captured on Cambridge Core between 12th September 2016 - 27th January 2021. This data will be updated every 24 hours.

Access
Hostname: page-component-898fc554b-z76t5 Total loading time: 0.542 Render date: 2021-01-27T05:11:53.136Z Query parameters: { "hasAccess": "1", "openAccess": "0", "isLogged": "0", "lang": "en" } Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": false, "newCiteModal": false }

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

ALFALFA Hα Reveals How Galaxies Use Their Hi Fuel
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

ALFALFA Hα Reveals How Galaxies Use Their Hi Fuel
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

ALFALFA Hα Reveals How Galaxies Use Their Hi Fuel
Available formats
×
×

Reply to: Submit a response


Your details


Conflicting interests

Do you have any conflicting interests? *