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 (37)

• The Herschel-SPIRE instrument and its in-flight performance
• GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
• A new calibration of stellar parameters of Galactic O stars
• Cold Dark Clouds: The Initial Conditions for Star Formation
• The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey
• Hi-GAL: the Herschel infrared Galactic Plane 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
• The initial conditions of stellar protocluster formation. I. A catalogue of Spitzer dark clouds
• The Bolocam Galactic Plane Survey -- II. Catalog of the Image Data
• Kinematic Distances to Molecular Clouds identified in the Galactic Ring Survey
• A Catalog of MSX Infrared Dark Cloud Candidates
• Over half of the far-infrared background light comes from galaxies at z >= 1.2
• The RMS Survey: 6 cm continuum VLA observations towards candidate massive YSOs in the northern hemisphere
• The Balloon-borne Large Aperture Submillimeter Telescope: BLAST
• Star-forming protoclusters associated with methanol masers
• 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
• Outflow and Infall in a Sample of Massive Star Forming Regions
• The High Resolution IRAS Galaxy Atlas
• BLAST: The Mass Function, Lifetimes, and Properties of Intermediate Mass Cores from a 50 Square Degree Submillimeter Galactic Survey in Vela (l = ~265)
• Observations of Massive Star Forming Regions with Water Masers: Mid-Infrared Imaging
• A Herschel study of YSO evolutionary stages and formation timelines in two fields of the Hi-GAL survey
• GRS 1915+105: the distance, radiative processes and energy-dependent variability
• Revision of the properties of the GRS 1915+105 jets: Clues from the large-scale structure
• The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) 2005: A 4 sq. deg Galactic Plane Survey in Vulpecula (l=59)
• The Arecibo Methanol Maser Galactic Plane Survey - III: Distances and Luminosities
• [Ne II] Observations of Gas Motions in Compact and Ultracompact H II Regions
• The RMS Survey: Far-Infrared Photometry of Young Massive Stars
• The Ionizing Stars of the Galactic Ultra-Compact HII Region G45.45+0.06
• BLAST05: Power Spectra of Bright Galactic Cirrus at Submillimeter Wavelengths
• The Balloon-borne Large Aperture Submillimeter Telescope (BLAST) 2005: Calibration and Targeted Sources
• [Ne II] 12.8 Micron Images of Four Galactic Ultracompact H II Regions: Ionized Neon Abundance as a Tracer of the Ionizing Stars
• Infrared and radio study of star forming regions associated with IRAS 19111+1048 and IRAS 19110+1045
• The environs of the ultracompact HII region G45.45+0.06
• Young massive stars in the ISOGAL survey I. VLA observations of the ISOGAL l=+45 field

Cited by in corpus (11)

• Trigonometric parallaxes of star forming regions in the Sagittarius spiral arm
• Evidence for Environmental Changes in the Submillimeter Dust Opacity
• 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
• The Balloon-Borne Large Aperture Submillimeter Telescope (BLAST) 2005: A 10 deg^2 Survey of Star Formation in Cygnus X
• Simultaneous evidence of edge collapse and hub-filament configurations: A rare case study of a Giant Molecular Filament G45.3+0.1
• The star formation law in Galactic high-mass star-forming molecular clouds
• Deconvolution of Images from BLAST 2005: Insight into the K3-50 and IC 5146 Star-Forming Regions
• 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