Discovery of a dense molecular cloud towards a young massive embedded star in 30 Doradus

Abstract

The 30 Doradus region in the Large Magellanic Cloud is one of the most outstanding star forming regions of the Local Group and a primary target to study star formation in an environment of low metallicity. In order to obtain a more complete picture of the not yet consumed or dispersed cool gas, we searched for line emission from molecular clouds that could be associated with molecular hydrogen emission detected in the region. We obtained a high sensitivity 12CO J=2-1 map with the 15-m SEST telescope, complemented by pointed observations of 13CO J=2-1 and CS J=2-1. We report the discovery of a dense molecular cloud towards an embedded young massive star at ~ 20" (~5 pc, at the distance of 50 kpc) northwest of R136, the compact massive central stellar cluster powering 30 Doradus in the LMC, that could be triggering star formation in the surrounding molecular clouds. We derived a molecular mass of $\lesssim 10^4$ \msol, a linear radius of 3 pc, as an upper limit, and a mean density of $\gtrsim 10^3$ cm${}^{-3}$ for the cloud. The detection of CS J=2-1 emission line indicates larger densities, $\sim 10^6$ cm${}^{-3}$. The dense molecular cloud is associated with molecular 2.12 um H2 emission. We suggest that the observed molecular gas could be the remains of dense molecular material surviving the action of strong UV fields and winds in which the young massive star has formed.

10 pages, 3 figures, accepted in A&A

References in corpus (4)

• Abundances and Isotope Ratios in the Magellanic Clouds: The Star Forming Environment of N113
• Results of the ESO-SEST Key Programme on CO in the Magellanic Clouds X. CO emission from star formation regions in LMC and SMC
• Submillimeter Line Emission from LMC N159W: a Dense, Clumpy PDR in a Low Metallicity Environment
• The Molecular Ridge Close to 30 Doradus in the Large Magellanic Cloud

Cited by in corpus (8)

• From Gas to Stars in Energetic Environments: Dense Gas Clumps in the 30 Doradus Region Within the Large Magellanic Cloud
• Pillars of creation amongst destruction: Star formation in molecular clouds near R136 in 30 Doradus
• Sulfur-bearing species in molecular clouds
• The impact of a massive star cluster on its surrounding matter in the Antennae overlap region
• VLT-MAD observations of the core of 30 Doradus
• Is the SNR HESS J1731-347 colliding with molecular clouds?
• Properties and Expected Number Counts of Active Galactic Nuclei and their Hosts in the Far Infrared
• Dense clumps survive in the vicinity of R136 in 30 Doradus