Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21930306b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #303.06
Astronomy and Astrophysics
Astronomy
Scientific paper
The Herschel infrared GALactic Plane Survey has been granted time to observe 480 square degrees of the Galactic Plane with the PACS and SPIRE on-board the 3.5 meter Herschel Space Observatory in five bands; 70, 160, 250, 350, and 500 μm. The original Hi-GAL Open Time Key Project observed 240 square-degrees in the inner Galaxy from l = -60o to +60o, b = -1o to +1o. This portion of the survey includes the Central Molecular Zone surrounding the Galactic center and the Molecular Ring in the inner Galaxy. During Open Time 1 (OT1), time was granted to observe an additional 240 square degrees in the outer Galaxy from l = 120o to 240o. Hi-GAL240 provides a high-resolution view of the closest portion of the Perseus Arm in the outer Galaxy and the anti-center region. A proposal has been submitted to complete coverage of the entire Galactic Plane in OT2. Hi-GAL provides a sensitive, high-resolution (5” to 35") view of the far-infrared and sub-mm dust-continuum from dense clumps, filaments, and clouds, highly embedded proto-stars, HII regions, FUV-heated bubbles, post-main sequence objects, and the diffuse ISM along the Galactic Plane. Hi-GAL data is being used to map the dust temperature and column density distribution in the Galaxy, to identify the most embedded proto-stars and proto-clusters, to measure the properties of dust emitting structures in all stages of their evolution as function of location and environment, and to probe the Galactic ecology - the cycling of gas from the ISM into stars and back into the ISM. Hi-GAL will serve as a template for the interpretation of far-infrared and sub-mm continuum emission from galaxies in the near and distant Universe where individual star forming complexes and dust structures can not be resolved. I will review some highlights and key results provided by Hi-GAL.
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