Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.9604n&link_type=abstract
American Astronomical Society, AAS Meeting #212, #96.04; Bulletin of the American Astronomical Society, Vol. 40, p.271
Astronomy and Astrophysics
Astronomy
2
Scientific paper
Dust is a most important and effective tracer of the global structural, physical and evolutionary conditions of the ISM material throughout the whole life-cycle of a galaxy. From diffuse interstellar cirrus to dense molecular clouds, from protostars to post-AGB envelopes, from supershells to supernovae remnants, the equatorial plane of our Galaxy provides the ideal laboratory to carry out investigations of the global and integrated properties of the different phases of the Galactic ISM, their evolution and interactions.
The Herschel satellite offers the optimum and unique combination of spectral coverage, unprecedented spatial resolution and sensitivity to efficiently map the bulk of dust emission in all ISM phases over the entire Galactic Plane. In combination with complementary and already available surveys both in the continuum at adjacent wavelengths, and in atomic and molecular gas tracers, it will be possible to address fundamental issues: What's the contribution of cold material to the overall mass budget of the Galaxy? What's the ISM temperature and the intensity of the Interstellar Radiation field throughout the Galaxy? What's the star formation efficiency as a function of Galactocentric radius and environmental conditions? What's the relationship between the local properties of star formation and the global integrated scaling laws derived for external galaxies? What's the timeline for the formation of massive stars? What are the variations in the gas-to-dust ratio, and what factors govern these variations?
Hi-GAL is a Herschel Open Time Key-Project project that will carry out a 60-600 microns 5-band photometric imaging survey of the inner Galactic Plane (between -60 and +60 degrees Galactic longitude and between -1 +1 degrees Galactic latitude), with an unprecedented 4-40" diffraction limited spatial resolution. Hi-GAL will provide the community with a publicly available, homogeneous and calibrated dataset of extraordinary legacy value for decades to come.
Molinari Sergio
Noriega-Crespo Alberto
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