Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1801b&link_type=abstract
American Astronomical Society, AAS Meeting #212, #18.01; Bulletin of the American Astronomical Society, Vol. 40, p.212
Astronomy and Astrophysics
Astronomy
Scientific paper
The completion of the SPITZER Legacy GLIMPSE survey, the BU-FCRAO 13-CO Galactic Ring Survey (GRS), the HI VLA Galactic Plane Survey (VGPS), the Multi-Array Galactic Plane Imaging Survey (MAGPIS), and the imminent release of the SPITZER Legacy MIPSGAL survey together enable for the first time a multi-wavelength analysis of the physical properties and evolutionary state of a large sample of inner Galaxy HII regions. Existing radio recombination line surveys show that nearly 300 HII regions are located in the zone where GLIMPSE and GRS overlap. Most of the sources are not optically visible. The HII region radio recombination line position and velocity targets a location where GRS 13-CO and MAGPIS/VGPS 20/21 cm continuum images show the distribution and relative geometry of molecular and ionized gas. The SPITZER GLIMPSE and MIPSGAL mid-infrared mosaic images reveal the highly embedded star cluster that ionizes the nebula, probe the distribution of the warm dust, and trace the polycyclic aromatic hydrocarbon emission from the photo-dissociation region that lies between the molecular and ionized zones. The VGPS HI survey is critical to this effort because HI absorption against the thermal continuum from the HII region can be used to resolve the kinematic distance ambiguity. Knowing the distance, one can derive the intrinsic physical properties of the nebula, turning column densities and line intensities into masses and luminosities. Compiling the physical properties of the ionized, atomic, and molecular components of this large sample of star forming regions in all stages of evolution and line of sight geometries will provide a fundamental database for studies of the evolution of the interstellar medium and the Giant Molecular Cloud/HII region/Star Cluster/Supernova Bubble life-cycle. Here we give several case study examples of individual Galactic HII regions.
Anderson Lauren
Bania Thomas M.
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