We use Herschel PACS and SPIRE observations of the edge-on spiral galaxy
UGC 4754, taken as part of the H-ATLAS SDP observations, to investigate
the dust energy balance in this galaxy. We build detailed SKIRT
radiative models based on SDSS and UKIDSS maps and use these models to
predict the far-infrared emission. We find that our radiative transfer
model underestimates the observed FIR emission by a factor of two to
three. Similar discrepancies have been found for other edge-on spiral
galaxies based on IRAS, ISO, and SCUBA data. Thanks to the good sampling
of the SED at FIR wavelengths, we can rule out an underestimation of the
FIR emissivity as the cause for this discrepancy. Instead we support
highly obscured star formation that contributes little to the optical
extinction as a more probable explanation.
Herschel is an ESA space observatory with science instruments provided
by European-led principal- investigator consortia and with important
participation from NASA.