Galactic Star Formation with NIKA2 (GASTON): Evidence of mass accretion onto dense clumps

A.J. Rigby , R. Adam (1) , P. Ade , H. Ajeddig (2) , M. Anderson , P. André (2) , E. Artis (3) , H. Aussel (2) , A. Bacmann (4) , A. Beelen (5) , A. Benoît (6) , S. Berta (7) , L. Bing (8) , O. Bourrion (3) , A. Bracco , M. Calvo (9) , A. Catalano (3) , M.De Petris , F.X. Désert (4) , S. Doyle , E.F. C. Driessen (7) , P. García , A. Gomez , J. Goupy (6) , F. Kéruzoré (3) , C. Kramer , B. Ladjelate , G. Lagache (8) , S. Leclercq (7) , J.F. Lestrade (10) , J.F. Macías-Pérez (3) , A. Maury (2) , P. Mauskopf , F. Mayet (3) , A. Monfardini (6) , M. Muñoz-Echeverría (3) , N. Peretto , L. Perotto (3) , G. Pisano , N. Ponthieu (4) , V. Revéret (2) , I. Ristorcelli (11) , A. Ritacco (5, 12) , C. Romero , H. Roussel (13) , F. Ruppin , K. Schuster (7) , S. Shu , A. Sievers , C. Tucker , E.J. Watkins , R. Zylka (7)

1 LLR - Laboratoire Leprince-Ringuet
2 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
3 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
4 IPAG - Institut de Planétologie et d'Astrophysique de Grenoble
5 IAS - Institut d'astrophysique spatiale
6 NEEL - HELFA - Hélium : du fondamental aux applications
7 IRAM - Institut de RadioAstronomie Millimétrique
8 LAM - Laboratoire d'Astrophysique de Marseille
9 NEEL - Cryo - Cryogénie
10 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres
11 IRAP - Institut de recherche en astrophysique et planétologie
12 Astrophysique
13 IAP - Institut d'Astrophysique de Paris

High-mass stars (m* ≳ 8 M⊙) play a crucial role in the evolution of galaxies, and so it is imperative that we understand how they are formed. We have used the New IRAM KIDs Array 2 (NIKA2) camera on the Institut de Radio Astronomie Millimétrique (IRAM) 30-m telescope to conduct high-sensitivity continuum mapping of ~ 2 deg2 of the Galactic plane (GP) as part of the Galactic Star Formation with NIKA2 (GASTON) large program. We have identified a total of 1467 clumps within our deep 1.15 mm continuum maps and, by using overlapping continuum, molecular line, and maser parallax data, we have determined their distances and physical properties. By placing them upon an approximate evolutionary sequence based upon 8 μm Spitzer imaging, we find evidence that the most massive dense clumps accrete material from their surrounding environment during their early evolution, before dispersing as star formation advances, supporting clump-fed models of high-mass star formation.

Domaines: Astrophysique [astro-ph]

A.J. Rigby, R. Adam, P. Ade, H. Ajeddig, M. Anderson, et al.. Galactic Star Formation with NIKA2 (GASTON): Evidence of mass accretion onto dense clumps. mm Universe @ NIKA2 , Jun 2021, Online, Italy. pp.00041, ⟨10.1051/epjconf/202225700041⟩. ⟨hal-03554395⟩