Results of the ESO-SEST Key Programme on CO in the Magellanic Clouds. IX. The giant LMC HII region complex N11

Abstract

We present maps and a catalogue containing the J=1-0 12CO parameters of 29 individual molecular clouds in the second-brightest LMC star formation complex, N11. In the southwestern part of N11, molecular clouds occur in a ring or shell surrounding the major OB star association LH9. In the northeastern part, a chain of molecular clouds delineates the rim of one of the so-called supergiant shells in the LMC. The well-defined clouds have dimensions close to those of the survey beam (diameters of 25 pc or less). Some of the clouds were also observed in J=2-1 12CO, and in the lower two transitions of 13CO. Clouds mapped with a twice higher angular resolution in J=2-1 12CO show substructure with dimensions once again comparable to those of the mapping beam. The few clouds for which we could model physical parameters have fairly warm (T(kin) = 60 - 150 K) and moderately dense (n(H2) = 3000 cm-3) gas. The northeastern chain of CO clouds, although lacking in diffuse intercloud emission, is characteristic of the more quiescent regions of the LMC and appears to have been subject to relatively little photo-processing. The clouds forming part of the southwestern shell or ring, however, are almost devoid of diffuse intercloud emission and also exhibit other characteristics of an extreme photon-dominated region (PDR).

arXiv comment14 pages; accepted for publication in A&A

References in corpus (1)

• The Distances of the Magellanic Clouds

Cited by in corpus (19)

• The Second Survey of the Molecular Clouds in the Large Magellanic Cloud by NANTEN. II. Star Formation
• Physical Properties of Giant Molecular Clouds in the Large Magellanic Cloud
• Spitzer observations of the Massive star forming complex S254-S258: structure and evolution
• A Spitzer Space Telescope far-infrared spectral atlas of compact sources in the Magellanic Clouds. I. The Large Magellanic Cloud
• Results of the ESO-SEST Key Programme on CO in the Magellanic Clouds X. CO emission from star formation regions in LMC and SMC
• Age distribution of young clusters and field stars in the SMC
• C+ Emission from the Magellanic Clouds II. [CII] maps of star-forming regions LMC-N 11, SMC-N 66, and several others
• A multiwavelength study of embedded clusters in W5-east, NGC7538, S235, S252 and S254-S258
• The Influence of Far-Ultraviolet Radiation on the Properties of Molecular Clouds in the 30 Dor Region of the Large Magellanic Cloud
• The 30 Doradus Molecular Cloud at 0.4 pc Resolution with the Atacama Large Millimeter/submillimeter Array: Physical Properties and the Boundedness of CO-emitting Structures
• Dense Clumps in Giant Molecular Clouds in the Large Magellanic Cloud: Density and Temperature Derived from ${}^{13}$CO($J=3-2$) Observations
• Tiny-Scale Molecular Structures in the Magellanic Clouds (Part 1)
• Submillimeter Line Emission from LMC N159W: a Dense, Clumpy PDR in a Low Metallicity Environment
• ALMA Reveals Potential Localized Dust Enrichment from Massive Star Clusters in II Zw 40
• Millimeter dust emission compared with other mass estimates in N11 molecular clouds in the LMC
• The dust properties and physical conditions of the interstellar medium in the LMC massive star forming complex N11
• Pre-main sequence stars in the stellar association N11 in the Large Magellanic Cloud
• 12CO and 13CO J=3-2 observations toward N11 in the Large Magellanic Cloud
• Giant molecular clouds and their Type classification in M74: Toward understanding star formation and cloud evolution