Implications of the PRONAOS observations for the large scale surveys with FIRST

Details Implications of the PRONAOS observations for the large scale surveys with FIRST Implications of the PRONAOS observations for the large scale surveys with FIRST

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.460..297b&link_type=abstract

The Promise of the Herschel Space Observatory. Eds. G.L. Pilbratt, J. Cernicharo, A.M. Heras, T. Prusti, & R. Harris. ESA-SP 460

Computer Science

Ism: Dust Property, Continuum Emission, Missions: Pronaos, First, Object: Taurus, Polaris

Scientific paper

We present recent sub-millimeter (200-600 microns) observations obtained with the balloon experiment Pronaos. These have lead to exciting and sometimes unexpected new results regarding the nature, the composition and chemistry of dust grains in the ISM. In particular, they reveal dust significantly colder than expected (T=12 K) in translucent and optically thin clouds at high galactic latitude, which can be interpreted as evidence for the existence of porous dust aggregates in diffuse clouds. The Pronaos observations also show a significant anticorrelation between dust equilibrium temperature and the spectral index of its emissivity law in the sub-millimeter. This may reflect quantum processes within the grains that appear only at low temperature and thus brings new insight on the nature of large dust grains in the ISM. Owing to the wavelength range covered and the high sensitivity achieved, the Pronaos observations prefigure what will be possible on large scale and higher angular resolution with FIRST. These results strongly argue in favor of a large survey of the diffuse ISM with FIRST and have direct implications about how to conduct such a survey.

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