Cold dust in giant barred galaxy NGC1365
  Observations of galaxies at sub-millimeter wavelengths, where the emission is
mainly due to cold dust, are required to constrain the dust physical properties
and provide important insight on the gas content of galaxies. We mapped NGC1365
at 870um with LABOCA, the Large APEX Bolometer Camera, allowing us to probe the
central mass concentration as well as the rate at which the gas flows to the
center. We obtained the dust physical properties both globally and locally for
different locations in the galaxy. A 20 K modified black body represents about
98% of the total dust content of the galaxy, the rest can be represented by a
warmer dust component of 40 K. The bar exhibits an east-west asymmetry in the
dust distribution: The eastern bar is heavier than the western bar by more than
a factor of 4. Integrating the dust SED, we derive a total infrared (IR)
luminosity of 9.8 x 10^{10} L_{\odot} leading to a dust-enshrouded star
formation rate of ~16.7 M_{\odot} per year in NGC1365. We derive the gas mass
from the measurements of the dust emission resulting in a CO-to-H2 conversion
factor of X_{CO}~1.2x10^{20} mol cm^{-2} (K km s^{-1})^{-1} in the central disk
including the bar. Taking into account the metallicity variation, the central
gas mass concentration is only ~20% at R<40" (3.6 kpc). On the other hand, the
time-scale with which the gas flows into the center, ~300 Myr, is rather short.
This indicates that the current central mass in NGC1365 is evolving fast due to
the strong bar.
