Abstract

Contributed Talk - Plenary

JWST IFU observations of massive YSO S7A in 30 Doradus

Jurk Katharina
Sternwarte Hamburg

We analyse high spatial and spectral resolution integral field observations of a ${sim}15mbox{--}20,mathrm{M}_odot$ MYSO S7A located in the vicinity of R136 in 30 Doradus in the Large Magellanic Cloud using NIRSpec and MIRI/MRS on JWST. We focus on the identification of the emission lines in the available $0.9mbox{--}27.5,mumathrm{m}$ wavelength range and create continuum-subtracted line-emission maps revealing the emission morphology for each transition. S7A presents itself as a MYSO with several extended structures in the most active star-forming region in the Local Group. We identify S7A as a MYSO externally-illuminated by the young massive star cluster R136 producing a C-shaped shell at ${sim}35,mathrm{kAU}$. The detection of CO bandhead emission together with H$_2$O and CO$_2$ ice absorption hints towards the presence of an accretion disk. Broad ion{H}{i} and ion{He}{i} recombination lines within ${sim}0.02,mathrm{pc}$ of the MYSO suggest photoionising radiation escaping from S7A. An hyper-compact ion{H}{ii} region or a disk wind is the likely explanation of the observed transitions. H$_2$ and $[ion{Fe}{ii}]$ emission from a knot oriented towards the south-west at ${sim}5mbox{--}8,mathrm{kAU}$ away from the MYSO traces an protostellar outflow. Extinction-corrected H$_2$ and $[ion{Fe}{ii}]$ line ratios confirm the presence of shocks. The low mass accretion rate $dot{M} lesssim 10^{-7},M_odot,mathrm{yr}^{-1}$ indicates S7A is an evolved MYSO which has commenced Hydrogen fusion within its core. Nevertheless, S7A remains embedded within a colder H$_2$ and dust structure with a complex morphology. Towards the north-east an additional YSO emerges from a condensation within the same structure.