Herschel Far-IR counterparts of SDSS galaxies: Analysis of commonly used
  Star Formation Rate estimates
  We study a hundred of galaxies from the spectroscopic Sloan Digital Sky
Survey with individual detections in the Far-Infrared Herschel PACS bands (100
or 160 $\mu$m) and in the GALEX Far-UltraViolet band up to z$\sim$0.4 in the
COSMOS and Lockman Hole fields. The galaxies are divided into 4 spectral and 4
morphological types. For the star forming and unclassifiable galaxies we
calculate dust extinctions from the UV slope, the H$\alpha$/H$\beta$ ratio and
the $L_{\rm IR}/L_{\rm UV}$ ratio. There is a tight correlation between the
dust extinction and both $L_{\rm IR}$ and metallicity. We calculate
SFR$_{total}$ and compare it with other SFR estimates (H$\alpha$, UV, SDSS)
finding a very good agreement between them with smaller dispersions than
typical SFR uncertainties. We study the effect of mass and metallicity, finding
that it is only significant at high masses for SFR$_{H\alpha}$. For the AGN and
composite galaxies we find a tight correlation between SFR and L$_{IR}$
($\sigma\sim$0.29), while the dispersion in the SFR - L$_{UV}$ relation is
larger ($\sigma\sim$0.57). The galaxies follow the prescriptions of the
Fundamental Plane in the M-Z-SFR space.
