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Article Dans Une Revue The Astrophysical Journal Supplement Année : 2023

ALMA-IMF VIII -- Combination of Interferometric Continuum Images with Single-Dish Surveys and Structural Analysis of Six Protoclusters

Daniel Díaz-González
  • Fonction : Auteur
Roberto Galván-Madrid
  • Fonction : Auteur
Adam Ginsburg
  • Fonction : Auteur
Pierre Dell'Ova
  • Fonction : Auteur
  • PersonId : 1178690
  • IdRef : 265251524
Stan Kurtz
  • Fonction : Auteur
Thomas Nony
  • Fonction : Auteur
Rudy Rivera-Soto
  • Fonction : Auteur
Rodrigo Álvarez-Gutiérrez
  • Fonction : Auteur
Melanie Armante
  • Fonction : Auteur
Melisse Bonfand
  • Fonction : Auteur
Antoine Gusdorf
Hong-Li Liu
  • Fonction : Auteur

Résumé

We present the combination of ALMA-IMF and single-dish continuum images from the Mustang-2 Galactic Plane Survey (MGPS90) at 3 millimeters and the Bolocam Galactic Plane Survey (BGPS) at 1 millimeter. Six and ten out of the fiffteen ALMA-IMF fields are combined with MGPS90 and BGPS, respectively. The combination is made via the feathering technique. We used the dendrogram algorithm throughout the combined images, and performed further analysis in the six fields with combination in both bands (G012.80, W43-MM1, W43-MM2, W43-MM3, W51-E, W51-IRS2). In these fields, we calculated spectral index maps and used them to separate regions dominated by dust or free-free emission, and then performed further structural analysis. We report the basic physical parameters of the dust-dominated (column densities, masses) and ionized (emission measures, hydrogen ionization photon rates) structures. We also searched for multi-scale relations in the dust-dominated structures across the analyzed fields, finding that the fraction of mass in dendrogram leaves (which we label as "Leaf Mass Eficiency", LME) as a function of molecular gas column density follows a similar trend: a rapid, exponential-like growth, with maximum values approaching 100% in most cases. The observed behaviour of the LME with gas column is tentatively interpreted as an indicator of large star formation activity within the ALMA-IMF protoclusters. W51-E and G012.80 stand out as cases with comparatively large and reduced potential for further star formation, respectively.
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Dates et versions

hal-04290564 , version 1 (16-11-2023)

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Daniel Díaz-González, Roberto Galván-Madrid, Adam Ginsburg, Frédérique Motte, Pierre Dell'Ova, et al.. ALMA-IMF VIII -- Combination of Interferometric Continuum Images with Single-Dish Surveys and Structural Analysis of Six Protoclusters. The Astrophysical Journal Supplement, 2023, ⟨10.48550/arXiv.2310.13872⟩. ⟨hal-04290564⟩
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