Comparing FIR, UV and SED star formation rates for IR-luminous galaxies at 1≤z≤2 in CANDELS
Abstract
Galaxy formation and evolution studies rely on the robust determination of galaxy properties such as stellar masses and star formation rates (SFR). One the one hand these are important to distinguish between star bursting galaxies, normally star forming galaxies and those in the process of quenching and reveal the underlying processes causing these phenomena. On the other hand, they are crucial to derive reliable estimates of global properties like the star formation rate density of the Universe and the stellar mass assembly. We exploit the excellent multi-wavelength data in the GOODS-S, GOODS-N, UDS and COSMOS CANDELS fields ranging from deep ground and space-based optical data, deep-NIR HST data from CANDELS to the deepest FIR PACS data available from CANDELS-Herschel and Pep/GOODS-Herschel to estimate SFRs of IR-luminous galaxies between redshift 1 and 2. We determine SFRs in three different ways:1) from SED-fitting to the optical/IR multi-wavelength data, 2) from far-IR luminosities using 24 micron and Herschel PACS fluxes and 3) from UV slope and UV luminosity measurements. While for the majority of objects the different estimates agree very well, we find a subsample of outliers that are classified as pseudo-quiescent by the SED-fit. We present possible reasons for these misclassifications as well as potential remedies.
- Publication:
-
IAU General Assembly
- Pub Date:
- August 2015
- Bibcode:
- 2015IAUGA..2257702P