The physical and dynamical structure of Serpens: Two very different sub-protoclusters - Astrophysics > Astrophysics of GalaxiesReport as inadecuate




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Abstract: The Serpens North Cluster is a nearby low mass star forming region which ispart of the Gould Belt. It contains a range of young stars thought tocorrespond to two different bursts of star formation and provides theopportunity to study different stages of cluster formation. This work aims tostudy the molecular gas in the Serpens North Cluster to probe the origin of themost recent burst of star formation in Serpens. Transitions of the C17O andC18O observed with the IRAM 30m telescope and JCMT are used to study the massand velocity structure of the region while the physical properties of the gasare derived using LTE and non-LTE analyses of the three lowest transitions ofC18O. The molecular emission traces the two centres of star formation which areseen in submillimetre dust continuum emission. In the ~40M sun NW sub-clusterthe gas and dust emission trace the same structures although there is evidenceof some depletion of the gas phase C18O. The gas has a very uniform temperature~10K and velocity ~8.5km-s throughout the region. This is in markedcontrast to the SE sub-cluster. In this region the dust and the gas tracedifferent features, with the temperature peaking between the submillimetrecontinuum sources, reaching up to ~14K. The gas in this region has doublepeaked line profiles which reveal the presence of a second cloud in the line ofsight. The submillimetre dust continuum sources predominantly appear located inthe interface region between the two clouds. Even though they are at a similarstage of evolution, the two Serpens sub-clusters have very differentcharacteristics. We propose that these differences are linked to the initialtrigger of the collapse in the regions and suggest that a cloud-cloud collisioncould explain the observed properties.



Author: A. Duarte-Cabral, G.A. Fuller, N. Peretto, J. Hatchell, E.F. Ladd, J. Buckle, J. Richer, S.F. Graves

Source: https://arxiv.org/







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