Multi-scale analysis of the Monoceros OB 1 star-forming region

Julien Montillaud (1) , Mika Juvela (2) , Charlotte Vastel (3) , Jinhua He , Tie Liu , Isabelle Ristorcelli (3) , David J. Eden (4) , Sung-Ju Kang , Kee-Tae Kim , Patrick M. Koch (5) , Chang Won Lee , Mark G. Rawlings (6) , Mika Saajasto (2) , Patricio Sanhueza , Archana Soam , Sarolta Zahorecz , Dana Alina , Rebeka Bögner (1) , David Cornu (3) , Yasuo Doi (7) , Johanna Malinen (8) , Douglas J. Marshall (9) , Elisabetta R. Micelotta (2) , Veli-Matti Pelkonen (10, 1) , L. Viktor Tóth (11) , Alessio Traficante , Ke Wang (12, 13)

1 UTINAM - Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213)
2 Helsingin yliopisto = Helsingfors universitet = University of Helsinki
3 IRAP - Institut de recherche en astrophysique et planétologie
4 LJMU - Liverpool John Moores University
5 ASIAA - Academia Sinica Institute of Astronomy and Astrophysics
6 University of Hawai'i [Hilo]
7 Tokyo University of Science [Tokyo]
8 University of Cologne
9 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
10 Department of Physics [Helsinki]
11 ELTE - Eötvös Loránd University
12 KIAA-PKU - Kavli Institute for Astronomy and Astrophysics [Beijing]
13 ESO - European Southern Observatory

Context. Current theories and models attempt to explain star formation globally, from core scales to giant molecular cloud scales. A multi-scale observational characterisation of an entire molecular complex is necessary to constrain them. We investigate star formation in G202.3+2.5, a ∼10 × 3 pc sub-region of the Monoceros OB1 cloud with a complex morphology that harbours interconnected filamentary structures.Aims. We aim to connect the evolution of cores and filaments in G202.3+2.5 with the global evolution of the cloud and to identify the engines of the cloud dynamics.Methods. In this first paper, the star formation activity is evaluated by surveying the distributions of dense cores and protostars and their evolutionary state, as characterised using both infrared observations from the Herschel and WISE telescopes and molecular line observations with the IRAM 30 m telescope.Results. We find ongoing star formation in the whole cloud, with a local peak in star formation activity around the centre of G202.3+2.5, where a chain of massive cores (10 − 50 M⊙) forms a massive ridge (≳150 M⊙). All evolutionary stages from starless cores to Class II protostars are found in G202.3+2.5, including a possibly starless and massive (52 M⊙) core, which presents a high column density (8 × 1022 cm−2).Conclusions. All the core-scale observables we examined point to an enhanced star formation activity that is centred on the junction between the three main branches of the ramified structure of G202.3+2.5. This suggests that the increased star formation activity results from the convergence of these branches. To further investigate the origin of this enhancement, it is now necessary to extend the analysis to larger scales in order to examine the relationship between cores, filaments, and their environment. We address these points through the analysis of the dynamics of G202.3+2.5 in a joint paper.

Keywords: ISM: clouds; stars: formation; extinction; dust

Domains: Astrophysics [astro-ph]

Julien Montillaud, Mika Juvela, Charlotte Vastel, Jinhua He, Tie Liu, et al.. Multi-scale analysis of the Monoceros OB 1 star-forming region: I. The dense core population. Astronomy and Astrophysics - A&A, 2019, 631, pp.L1. ⟨10.1051/0004-6361/201936377⟩. ⟨cea-02314376⟩