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  DeGaS-MC: Dense Gas Survey in the Magellanic Clouds: I. An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC

Galametz, M., Schruba, A., Breuck, C. D., Immer, K., Chevance, M., Galliano, F., et al. (2020). DeGaS-MC: Dense Gas Survey in the Magellanic Clouds: I. An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC. Astronomy and Astrophysics, 643: A63. doi:10.1051/0004-6361/202038641.

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Galametz, M., Author
Schruba, A.1, Author              
Breuck, C. De, Author
Immer, K., Author
Chevance, M., Author
Galliano, F., Author
Gusdorf, A., Author
Lebouteiller, V., Author
Lee, M. Y., Author
Madden, S. C., Author
Polles, F. L., Author
van Kempen, T. A., Author
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: Context. Understanding the star-forming processes is key to understanding the evolution of galaxies. Investigating star formation requires precise knowledge of the properties of the dense molecular gas complexes where stars form and a quantification of how they are affected by the physical conditions to which they are exposed. The proximity, low metallicity, and wide range of star formation activity of the Large and Small Magellanic Clouds (LMC and SMC) make them prime laboratories to study how local physical conditions impact the dense gas reservoirs and their star formation efficiency. Aims. The aim of the Dense Gas Survey for the Magellanic Clouds (DeGaS-MC) project is to expand our knowledge of the relation between dense gas properties and star formation activity by targeting the LMC and SMC observed in the HCO+(2−1) and HCN(2−1) transitions. Methods. We carried out a pointing survey targeting two lines toward ∼30 LMC and SMC molecular clouds using the SEPIA180 instrument installed on the Atacama Pathfinder EXperiment (APEX) telescope. We performed a follow-up mapping campaign of the emission in the same transition in 13 star-forming regions. This first paper provides line characteristic catalogs and integrated line-intensity maps of the sources. Results. HCO+(2−1) is detected in 20 and HCN(2−1) in 8 of the 29 pointings observed. The dense gas velocity pattern follows the line-of-sight velocity field derived from the stellar population. The three SMC sources targeted during the mapping campaign were unfortunately not detected in our mapping campaign but both lines are detected toward the LMC 30Dor, N44, N105, N113, N159W, N159E, and N214 regions. The HCN emission is less extended than the HCO+ emission and is restricted to the densest regions. The HCO+(2−1)/HCN(2−1) brightness temperature ratios range from 1 to 7, which is consistent with the large ratios commonly observed in low-metallicity environments. A larger number of young stellar objects are found at high HCO+ intensities and lower HCO+/HCN flux ratios, and thus toward denser lines of sight. The dense gas luminosities correlate with the star formation rate traced by the total infrared luminosity over the two orders of magnitude covered by our observations, although substantial region-to-region variations are observed.

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Language(s): eng - English
 Dates: 2020-11-03
 Publication Status: Published online
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 Table of Contents: -
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 Identifiers: DOI: 10.1051/0004-6361/202038641
Other: LOCALID: 3284719
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 643 Sequence Number: A63 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1