The VLA-COSMOS 3 GHz Large Project: The cosmic star formation history since z~5
| Autor: | Novak, M., Smolcic, V., Delhaize, J., Delvecchio, I., Zamorani, G., Baran, N., Bondi, M., Capak, P., Carilli, C. L., Ciliegi, P., Civano, F., Ilbert, O., Karim, A., Laigle, C., Fevre, O. Le, Marchesi, S., McCracken, H., Miettinen, O., Salvato, M., Sargent, M., Schinnerer, E., Tasca, L. |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | A&A 602, A5 (2017) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/201629436 |
| Popis: | We make use of the deep Karl G. Jansky Very Large Array (VLA) COSMOS radio observations at 3 GHz to infer radio luminosity functions of star-forming galaxies up to redshifts of z~5 based on approximately 6000 detections with reliable optical counterparts. This is currently the largest radio-selected sample available out to z~5 across an area of 2 square degrees with a sensitivity of rms=2.3 ujy/beam. By fixing the faint and bright end shape of the radio luminosity function to the local values, we find a strong redshift trend that can be fitted with a pure luminosity evolution L~(1+z)^{(3.16 +- 0.2)-(0.32 +- 0.07) z}. We estimate star formation rates (SFRs) from our radio luminosities using an infrared (IR)-radio correlation that is redshift dependent. By integrating the parametric fits of the evolved luminosity function we calculate the cosmic SFR density (SFRD) history since z~5. Our data suggest that the SFRD history peaks between 2 Comment: 18 pages, 8 figures, 2 tables, accepted for publication in A&A |
| Databáze: | arXiv |
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