Near-identical star formation rate densities from Hα and FUV at redshift zero
Authors
Audcent-Ross, Fiona M
Meurer, Gerhardt R
Wong, OI
Zheng, Z
Hanish, D
Zwaan, MA
Bland-Hawthorn, J
Elagali, A
Meyer, M
Putman, ME
Ryan-Webber, EV
Sweet, SM
Thilker, DA
Seibert, M
Allen, R
Dopita, MA
Doyle-Pegg, MT
Drinkwater, M
Ferguson, HC
Freeman, KC
Heckman, TM
Jr, RC Kennicutt
Kilborn, VA
Kim, JH
Knezek, PM
Koribalski, B
Smith, RC
Staveley-Smith, L
Webster, RL
Werk, JK
Publication Date
2018Journal Title
Monthly Notices of the Royal Astronomical Society
ISSN
1365-2966
Publisher
Oxford University Press
Volume
480
Issue
1
Pages
119-133
Type
Article
Metadata
Show full item recordCitation
Audcent-Ross, F. M., Meurer, G. R., Wong, O., Zheng, Z., Hanish, D., Zwaan, M., Bland-Hawthorn, J., et al. (2018). Near-identical star formation rate densities from Hα and FUV at redshift zero. Monthly Notices of the Royal Astronomical Society, 480 (1), 119-133. https://doi.org/10.1093/mnras/sty1538
Abstract
For the first time both H$\alpha$ and far-ultraviolet (FUV) observations from an HI-selected sample are used to determine the dust-corrected star formation rate density (SFRD: $\dot{\rho}$) in the local Universe. Applying the two star formation rate indicators on 294 local galaxies we determine log($\dot{\rho}$$ _{H\alpha}) = -1.68~^{+0.13}_{-0.05}$ [M$_{\odot} $ yr$^{-1} $ Mpc$^{-3}]$ and log($\dot{\rho}_{FUV}$) $ = -1.71~^{+0.12}_{-0.13}$ [M$_\odot $ yr$^{-1} $ Mpc$^{-3}]$. These values are derived from scaling H$\alpha$ and FUV observations to the HI mass function. Galaxies were selected to uniformly sample the full HI mass (M$_{HI}$) range of the HI Parkes All-Sky Survey (M$_{HI} \sim10^{7}$ to $\sim10^{10.7}$ M$_{\odot}$). The approach leads to relatively larger sampling of dwarf galaxies compared to optically-selected surveys. The low HI mass, low luminosity and low surface brightness galaxy populations have, on average, lower H$\alpha$/FUV flux ratios than the remaining galaxy populations, consistent with the earlier results of Meurer. The near-identical H$\alpha$- and FUV-derived SFRD values arise with the low H$\alpha$/FUV flux ratios of some galaxies being offset by enhanced H$\alpha$ from the brightest and high mass galaxy populations. Our findings confirm the necessity to fully sample the HI mass range for a complete census of local star formation to include lower stellar mass galaxies which dominate the local Universe.
Keywords
galaxies: luminosity function, galaxies: star formation, surveys, ultraviolet: galaxies
Sponsorship
Partial funding for the SINGG and SUNGG surveys came from NASA grants NAG5-13083 (LTSA program), GALEX GI04- 0105-0009 (NASA GALEX Guest Investigator grant) and NNX09AF85G (GALEX archival grant) to G.R. Meurer. FAR acknowledges partial funding from the Department of Physics, University of Western Australia. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Funder references
Science and Technology Facilities Council (ST/N000927/1)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1093/mnras/sty1538
This record's URL: https://www.repository.cam.ac.uk/handle/1810/282915
Rights
Licence:
http://www.rioxx.net/licenses/all-rights-reserved
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