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Near-identical star formation rate densities from Hα and FUV at redshift zero

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cam.issuedOnline2018-06-12
cam.orpheus.successThu Jan 30 10:54:32 GMT 2020 - The item has an open VoR version.
dc.contributor.authorAudcent-Ross, Fiona M
dc.contributor.authorMeurer, Gerhardt R
dc.contributor.authorWong, OI
dc.contributor.authorZheng, Z
dc.contributor.authorHanish, D
dc.contributor.authorZwaan, MA
dc.contributor.authorBland-Hawthorn, J
dc.contributor.authorElagali, A
dc.contributor.authorMeyer, M
dc.contributor.authorPutman, ME
dc.contributor.authorRyan-Webber, EV
dc.contributor.authorSweet, SM
dc.contributor.authorThilker, DA
dc.contributor.authorSeibert, M
dc.contributor.authorAllen, R
dc.contributor.authorDopita, MA
dc.contributor.authorDoyle-Pegg, MT
dc.contributor.authorDrinkwater, M
dc.contributor.authorFerguson, HC
dc.contributor.authorFreeman, KC
dc.contributor.authorHeckman, TM
dc.contributor.authorJr, RC Kennicutt
dc.contributor.authorKilborn, VA
dc.contributor.authorKim, JH
dc.contributor.authorKnezek, PM
dc.contributor.authorKoribalski, B
dc.contributor.authorSmith, RC
dc.contributor.authorStaveley-Smith, L
dc.contributor.authorWebster, RL
dc.contributor.authorWerk, JK
dc.date.accessioned2018-09-29T06:08:25Z
dc.date.available2018-09-29T06:08:25Z
dc.date.issued2018
dc.description.abstractFor 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.
dc.description.sponsorshipPartial 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.
dc.identifier.doi10.17863/CAM.30278
dc.identifier.eissn1365-2966
dc.identifier.issn1365-2966
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/282915
dc.language.isoeng
dc.publisherOxford University Press
dc.publisher.urlhttp://dx.doi.org/10.1093/mnras/sty1538
dc.subjectgalaxies: luminosity function
dc.subjectgalaxies: star formation
dc.subjectsurveys
dc.subjectultraviolet: galaxies
dc.titleNear-identical star formation rate densities from Hα and FUV at redshift zero
dc.typeArticle
dcterms.dateAccepted2018-06-08
prism.endingPage133
prism.issueIdentifier1
prism.publicationNameMonthly Notices of the Royal Astronomical Society
prism.startingPage119
prism.volume480
pubs.funder-project-idScience and Technology Facilities Council (ST/N000927/1)
rioxxterms.licenseref.startdate2018-06-08
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review
rioxxterms.versionofrecord10.1093/mnras/sty1538

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