The VLT-FLAMES Tarantula Survey. IX. The interstellar medium seen through Diffuse Interstellar Bands and neutral sodium
Jacco Th. van Loon (Keele University, UK), Mandy Bailey (Keele),, Benjamin L. Tatton (Keele), Jesus Maiz Apellaniz (IAA Granada), Paul A., Crowther (Sheffield), Alex de Koter (Amsterdam), Christopher J. Evans (UK ATC, Edinburgh), Vincent Henault-Brunet (SUPA Edinburgh)

TL;DR
This study uses Diffuse Interstellar Bands and neutral sodium absorption to map and analyze the interstellar medium in the Tarantula Nebula, revealing environmental variations and gas structures in the LMC and Milky Way.
Contribution
It provides detailed spatial maps of DIBs and Na I in the Tarantula Nebula, linking DIB strengths to environmental conditions and carrier properties, and identifies gas dynamics influenced by stellar winds.
Findings
Strong DIBs in quiescent cloud regions
Weak DIBs in harsh, bubble-like environments
Detection of gas structures and stellar wind effects
Abstract
The Tarantula Nebula (30 Dor) is a spectacular star-forming region in the Large Magellanic Cloud, seen through gas in the Galactic Disc and Halo. Diffuse Interstellar Bands offer a unique probe of the diffuse, cool-warm gas in these regions. The aim is to use DIBs as diagnostics of the local interstellar conditions, whilst at the same time deriving properties of the yet-unknown carriers. Spectra of over 800 early-type stars from the VLT Flames Tarantula Survey (VFTS) were analysed. Maps were created, separately, for the Galactic and LMC absorption in the DIBs at 4428 and 6614 Ang and - in a smaller region near the central cluster R136 - neutral sodium (Na I D); we also measured the DIBs at 5780 and 5797 Ang. The maps show strong 4428 and 6614 Ang DIBs in the quiescent cloud complex to the south of 30 Dor but weak absorption in the harsher environments to the north (bubbles) and near the…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Stellar, planetary, and galactic studies · Gamma-ray bursts and supernovae
