Multiwavelength study of the G345.5+1.5 region

Abstract

Star-forming regions are usually studied in the context of Galactic surveys, but dedicated observations are sometimes needed when the study reaches beyond the survey area. Here, we studied the G345.5+1.5 region, which is located slightly above the Galactic plane, to understand its star formation properties. We combined the LABOCA and ${}^{12}$CO(4$-$3) transition line observations complemented with the Hi-GAL and $Spitzer$-GLIMPSE surveys to study the star formation toward this region. We used the Clumpfind algorithm to extract the clumps from the 870$\mu$m and ${}^{12}$CO(4$-$3) data. Radio emission at 36cm was used to estimate the number of HII regions and to remove the contamination from the free-free emission at 870$\mu$m. We employed color-color diagrams and spectral energy distribution slopes to distinguish between prestellar and protostellar clumps. We studied the boundedness of the clumps through the virial parameter. Finally, we estimated the star formation efficiency and star formation rate of the region and used the Schmidt-Kennicutt diagram to compare its ability to form stars. Of the 13 radio sources that we found using the MGPS-2 catalog, 7 are found to be associated with HII regions corresponding to late-B or early-O stars. We found 45 870$\mu$m clumps, and 107 ${}^{12}$CO clumps. More than 50\% of the clumps are protostellar and bounded and are able to host star formation. High SFR and SFR density values are associated with the region, with an SFE of a few percent. With submillimeter, CO transition, and short-wavelength infrared observations, our study reveals a population of massive stars, protostellar and bound starless clumps, toward G345.5+1.5. This region is therefore actively forming stars, and its location in the starburst quadrant of the Schmidt-Kennicutt diagram is comparable to other star-forming regions found within the Galactic plane.

20 pages - 15 figures

References in corpus (19)

• Cold Dark Clouds: The Initial Conditions for Star Formation
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• The Molonglo Galactic Plane Survey (MGPS-2): Compact Source Catalogue
• The Nature of the Dense Core Population in the Pipe Nebula: Thermal Cores Under Pressure
• Star formation around RCW 120, the perfect bubble
• The dangers of being trigger--happy
• ATLASGAL - Kinematic distances and the dense gas mass distribution of the inner Galaxy
• VLT K-band spectroscopy of massive young stellar objects in (ultra-)compact HII regions
• Feedback in Clouds II: UV Photoionisation and the first supernova in a massive cloud
• Dense core properties in the Infrared Dark cloud G14.225-0.506 revealed by ALMA
• The W43-MM1 mini-starburst ridge, a test for star formation efficiency models
• Herschel Observations of the W3 GMC: Clues to the Formation of Clusters of High-Mass Stars
• The JCMT and Herschel Gould Belt Surveys: A comparison of SCUBA-2 and Herschel data of dense cores in the Taurus dark cloud L1495
• Distance biases in the estimation of the physical properties of Hi-GAL compact sources-I. Clump properties and the identification of high-mass star forming candidates
• Spatial distribution of star formation related to ionized regions throughout the inner Galactic plane
• The Effects of Protostellar Jet Feedback on Turbulent Collapse
• An analysis of star formation with Herschel in the Hi-GAL Survey. II. The tips of the Galactic bar
• The segregation of starless and protostellar clumps in the Hi-GAL l=224deg region
• G345.45+1.50: An expanding ring-like structure with massive star formation

Cited by in corpus (2)

• Bird's eye view of molecular clouds in the Milky Way: I. Column density and star formation from sub-pc to kpc scales
• Characterization of dense Planck clumps observed with Herschel and SCUBA-2