Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-10-19
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
18 pages, 28 figures plus 23 pages online material; accepted for publication in A&A
Scientific paper
Based on color-selected IRAS point sources, we have started to conduct a survey of 47 high-mass star-forming regions in the southern hemisphere in 870um dust continuum and molecular line emission in several frequency ranges between 290 GHz and 806 GHz. This paper describes the pilot study of the three sources IRAS12326-6245, IRAS16060-5146, and IRAS16065-5158. To characterize the physical and chemical properties of southern massive star-forming regions, the three high-luminosity southern hemisphere hot cores were observed with APEX in five frequency setups aimed at groups of lines from the following molecules: CH3OH, H2CO, and CH3CN. Using the LTE approximation, temperatures, source sizes, and column densities were determined through modeling of synthetic spectra with the XCLASS program. Dust continuum observations were done with the Large APEX BOlometer CAmera (LABOCA) at 870um and the 3mm continuum was imaged with the ATCA. Based on the detection of high-excitation CH3CN lines and lines from complex organic species, the three sources are classified as line rich, hot core type sources. For all three, the modeling indicates that the line emission emerges from a combination of an extended, cooler envelope, and a hot compact component. All three sources show an overabundance of oxygen-bearing species compared to nitrogen-bearing species. Based on the results obtained in the three sources, which served as templates for the survey, the most promising (and feasible) frequency setups for the remaining 44 sources were decided upon.
Dedes Carolin
Leurini Silvia
Menten Karl. M.
Ott Jorgen
Schilke Peter
No associations
LandOfFree
A study of three southern high-mass star-forming regions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A study of three southern high-mass star-forming regions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A study of three southern high-mass star-forming regions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-268786