EPoS Contribution
EPoS Contribution
Multi-scale analysis of the Mon OB 1 star-forming region: towards a systemic view of giant molecular clouds

Julien Montillaud
UTINAM / UFC, Besancon, FR
Modern star formation simulations have the ability to model the evolution of molecular clouds over many scales, opening the way to the study of all the complexity in GMC evolution, potentially including gravity, turbulence, magnetic fields, stellar feedback, chemistry... We intend to observationally characterize one GMC as extensively as possible to provide a new comprehensive reference. We have selected Mon OB1 for a multi-scale, multi-tracer study. Its distance (~760 pc) makes it feasible to map its ~50 pc extent entirely at core-scale resolution in the usual dust and molecular emissions with single-dish telescopes, while the disk scales are reachable using interferometers. Using Herschel and IRAM-30m observations we initiated this characterisation from core to filament scales on a peripheral branched filament, where we found one of the most nearby massive clumps that we demonstrated to be located at the collision point between the filament branches. We showed that this local dynamics is likely to result either from the global collapse of the cloud or from the adjacent expanding bubble, or even from their combination. On- going programs are dedicated to the characterisation of the magnetic field in this clump, while a large program at the TRAO-14m telescope is currently mapping the whole GMC in 12/13CO to examine its dynamics from cloud to core scales. Complemented with archival HI and stellar observations (HI4PI, Gaia), our analysis is heading to a systemic view of Mon OB1, where the evolution of each sub-part is understood in the context of the overall cloud evolution.
Caption: Left: RGB view of Mon OB1, with R=Planck 357 GHz, G=WISE 12mic, B=Halpha Middle: PACS 160 μm Right: Color scale = N2H+ centroid velocity; blue contours = 13CO integrated between 3.6 and 6.0 km/s; red contours = 13CO integrated between 6.3 and 9.3 km/s.
Collaborators:
D. Alina, NU, Nur-Sultan, KZ
R. Boegner, ELTE/UTINAM, HU/FR
D. Cornu, UTINAM, FR
M. Juvela, U Helsinki, FI
S.-J. Kang, KASI, KR
T. Liu, SAO, CN
I. Ristorcelli, IRAP, FR
L. V. Toth, ELTE, HU
C. Vastel, IRAP, FR
Key publication

Suggested Session: Molecular Clouds