The survey for ionization in neutral gas galaxies. II. The star formation rate density of the local universe

Hanish, D. H., Meurer, G. R., Ferguson, H. C., Zwaan, M. A., Heckman, T. M., Staveley-Smith, L., Bland-Hawthorn, J., Kilborn, V. A., Koribalski, B. S., Putman, M. E., Doyle, M. T., Drinkwater, M J, Ryan-Weber, E. V., Oey, M. S. and Kennicutt, Jr., R. C. (2006) The survey for ionization in neutral gas galaxies. II. The star formation rate density of the local universe. Astrophysical Journal, 649 1: 150-162. doi:10.1086/504681

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Author Hanish, D. H.
Meurer, G. R.
Ferguson, H. C.
Zwaan, M. A.
Heckman, T. M.
Staveley-Smith, L.
Bland-Hawthorn, J.
Kilborn, V. A.
Koribalski, B. S.
Putman, M. E.
Doyle, M. T.
Drinkwater, M J
Ryan-Weber, E. V.
Oey, M. S.
Kennicutt, Jr., R. C.
Title The survey for ionization in neutral gas galaxies. II. The star formation rate density of the local universe
Journal name Astrophysical Journal   Check publisher's open access policy
ISSN 0004-637X
Publication date 2006-09-20
Sub-type Article (original research)
DOI 10.1086/504681
Open Access Status File (Publisher version)
Volume 649
Issue 1
Start page 150
End page 162
Total pages 13
Place of publication Philadelphia, PA, United States
Publisher Institute of Physics Publishing
Language eng
Abstract We derive observed H alpha and R-band luminosity densities of an H I-selected sample of nearby galaxies using the SINGG sample to be l'(H alpha) = (9.4 +/- 1.8) x 10(38) h(70) ergs s(-1) Mpc(-3) for H alpha and l'(R) = (4.4 +/- 9.7) x 10(37) h(70) ergs s(-1) angstrom(-1) Mpc(-3) in the R band. This R-band luminosity density is approximately 70% of that found by the Sloan Digital Sky Survey. This leads to a local star formation rate density of log ((rho)over dot(SFR) [M-circle dot yr(-1) Mpc(-3)]) = -1.80(-0.07)(+0.13)(random) +/- 0.03(systematic) + log (h(70)) after applying a mean internal extinction correction of 0.82 mag. The gas cycling time of this sample is found to be t(gas) = 7.5(-2.1)(+1.3) Gyr, and the volume-averaged equivalent width of the SINGG galaxies is EW(H alpha) = 28.8(-4.7)(+7.2) angstrom (21.2-3.5+4.2 angstrom without internal dust correction). As with similar surveys, these results imply that (rho)over dot(SFR)(z) decreases drastically from z similar to 1.5 to the present. A comparison of the dynamical masses of the SINGG galaxies evaluated at their optical limits with their stellar and H I masses shows significant evidence of downsizing: the most massive galaxies have a larger fraction of their mass locked up in stars compared with H I, while the opposite is true for less massive galaxies. We show that the application of the Kennicutt star formation law to a galaxy having the median orbital time at the optical limit of this sample results in a star formation rate decay with cosmic time similar to that given by the. (rho)over dot(SFR)(z) evolution. This implies that the (rho)over dot(SFR)(z) evolution is primarily due to the secular evolution of galaxies, rather than interactions or mergers. This is consistent with the morphologies predominantly seen in the SINGG sample.
Keyword Astronomy & Astrophysics
galaxies : starburst
stars : formation
Brightest Hipass Galaxies
High-redshift Galaxies
Luminosity Function
Forming Galaxies
Spiral Galaxies
Mass Function
Formation History
Spitzer View
Sky Survey
Q-Index Code C1
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 19:24:01 EST