The BLAST View of the Star Forming Region in Aquila (ell=45deg,b=0deg)

Abstract

We have carried out the first general submillimeter analysis of the field towards GRSMC 45.46+0.05, a massive star forming region in Aquila. The deconvolved 6 deg^2 (3\degree X 2\degree) maps provided by BLAST in 2005 at 250, 350, and 500 micron were used to perform a preliminary characterization of the clump population previously investigated in the infrared, radio, and molecular maps. Interferometric CORNISH data at 4.8 GHz have also been used to characterize the Ultracompact HII regions (UCHIIRs) within the main clumps. By means of the BLAST maps we have produced an initial census of the submillimeter structures that will be observed by Herschel, several of which are known Infrared Dark Clouds (IRDCs). Our spectral energy distributions of the main clumps in the field, located at ~7 kpc, reveal an active population with temperatures of T~35-40 K and masses of ~10^3 Msun for a dust emissivity index beta=1.5. The clump evolutionary stages range from evolved sources, with extended HII regions and prominent IR stellar population, to massive young stellar objects, prior to the formation of an UCHIIR.The CORNISH data have revealed the details of the stellar content and structure of the UCHIIRs. In most cases, the ionizing stars corresponding to the brightest radio detections are capable of accounting for the clump bolometric luminosity, in most cases powered by embedded OB stellar clusters.

References in corpus (13)

• Cold Dark Clouds: The Initial Conditions for Star Formation
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• A Catalog of Extended Green Objects (EGOs) in the GLIMPSE Survey: A new sample of massive young stellar object outflow candidates
• The VLA Galactic Plane Survey
• Kinematic Distances to Molecular Clouds identified in the Galactic Ring Survey
• Over half of the far-infrared background light comes from galaxies at z >= 1.2
• The Balloon-borne Large Aperture Submillimeter Telescope: BLAST
• Molecular clouds and clumps in the Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• The Arecibo Methanol Maser Galactic Plane Survey--I: Data
• SANEPIC: A Map-Making Method for Timestream Data From Large Arrays
• [Ne II] Observations of Gas Motions in Compact and Ultracompact H II Regions
• The Ionizing Stars of the Galactic Ultra-Compact HII Region G45.45+0.06
• The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) 2005: Calibration and Targeted Sources

Cited by in corpus (7)

• Trigonometric parallaxes of star forming regions in the Sagittarius spiral arm
• A systematic TMRT observational study of Galactic ${}^{12}$C/${}^{13}$C ratios from Formaldehyde
• Herschel Observations of the W3 GMC: Clues to the Formation of Clusters of High-Mass Stars
• Galactic H2CO Densitometry I: Pilot survey of Ultracompact HII regions and methodology
• Simultaneous evidence of edge collapse and hub-filament configurations: A rare case study of a Giant Molecular Filament G45.3+0.1
• Infrared study of the star-forming region associated with the UC HII regions G45.07+0.13 and G45.12+0.13
• MeerKAT and ALMA view of the AGAL045.804-0.356 clump