Séminaire IPAG

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ALMA-IMF: Exploring the core population, kinematics, and chemistry towards 15 massive protoclusters

jeudi 14 septembre 2023 - 11h00

Nichol Cunningham - IPAG
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To understand the mechanism of star formation, it is fundamental to investigate the distribution, morphology and kinematics of the gas and dust in cores, clumps and clusters. This requires probing a large homogeneous selection of protoclusters recently achieved within the ALMA-IMF Large program. I will present an overview of the ALMA-IMF Large Program (Motte et al., 2022), which covers a total non-contiguous area of 53 square parsecs towards 15 massive nearby (2 - 5.5 kpc) protoclusters that span a range of well-defined early evolutionary stages and masses (including W51-IRS2, W43). ALMA-IMF covers a wealth of molecular lines, such as DCN (3-2), N2H+ (1-0), N2D+ (3-2), DCO+ (3-2), C18O (2-1), 13CS (5-4), and SiO (5-4). I will present the first highlights from the ALMA-IMF survey, exploring the core population and core mass function (CMF), along with the kinematics, chemical and morphological differences across the 15 protoclusters in the survey. I will then present recent work utilizing the DCN (3-2) emission as a tracer of the gas and kinematics associated with continuum cores across the 15 protoclusters (Cunningham et al. 2023). DCN (3-2) traces a diversity of morphology and complex velocity structure, which tends to be more filamentary and widespread in evolved regions and is more compact in the young and intermediate-stage protoclusters, likely due to the time evolution of the temperature and density with protocluster evolution. Furthermore, I will present the initial results of a multi-line analysis towards two protoclusters from ALMA-IMF with different evolutionary classifications, which show marked differences in their chemistry, morphology and kinematics.

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Hôtes : Frédérique Motte

Salle Manuel Forestini, 414 rue de la piscine, 38400 Saint Martin d'Hères