Bibliographic Details
| Title: |
Near-identical star formation rate densities from H$\alpha$ and FUV at redshift zero |
| Authors: |
Audcent-Ross, Fiona M., Meurer, Gerhardt R., Wong, O. I., Zheng, Z., Hanish, D., Zwaan, M. A., Bland-Hawthorn, J., Elagali, A., Meyer, M., Putman, M. E., Ryan-Webber, E. V., Sweet, S. M., Thilker, D. A., Seibert, M., Allen, R., Dopita, M. A., Doyle-Pegg, M. T., Drinkwater, M., Ferguson, H. C., Freeman, K. C., Heckman, T. M., Kennicutt Jr, R. C., Kilborn, V. A., Kim, J. H., Knezek, P. M., Koribalski, B., Smith, R. C., Staveley-Smith, L., Webster, R. L., Werk, J. K. |
| Publication Year: |
2018 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Astrophysics of Galaxies |
| More Details: |
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.
Comment: 17 pages, 7 figures |
| Document Type: |
Working Paper |
| DOI: |
10.1093/mnras/sty1538 |
| Access URL: |
http://arxiv.org/abs/1806.05875 |
| Accession Number: |
edsarx.1806.05875 |
| Database: |
arXiv |
