Volume 540, April 2012
|Number of page(s)||13|
|Section||Interstellar and circumstellar matter|
|Published online||15 March 2012|
Herschel observations of a potential core-forming clump: Perseus B1-E
1 Department of Physics and Astronomy, University of Victoria, PO Box 355, STN CSC, Victoria BC, V8W 3P6, Canada
2 National Research Council Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria BC, V9E 2E7, Canada
3 Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/Service d’Astrophysique, CEA Saclay, 91191 Gif-sur-Yvette, France
4 IAPS – INAF, via del Fosso del Cavaliere, 100, 00133 Roma, Italy
5 CNRS, IRAP, 9 Av. colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France
6 Université de Toulouse, UPS-OMP, IRAP, 31028 Toulouse Cedex 4, France
7 ESO, Karl Schwarzschild-Strasse 2, 87548 Garching bei Munchen, Germany
8 School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
9 Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON, M5S 3H8, Canada
10 INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy
11 The Rutherford Appleton Laboratory, Chilton, Didcot OX11 0NL, UK
12 The Open University, Department of Physics and Astronomy, Milton Keynes MK7 6AA, UK
13 Department of Physics and Astronomy, McMaster University, Hamilton, ON, L8S 4M1, Canada
Received: 23 August 2011
Accepted: 28 November 2011
We present continuum observations of the Perseus B1-E region from the Herschel Gould Belt Survey. These Herschel data reveal a loose grouping of substructures at 160−500 μm not seen in previous submillimetre observations. We measure temperature and column density from these data and select the nine densest and coolest substructures for follow-up spectral line observations with the Green Bank Telescope. We find that the B1-E clump has a mass of ~100 M⊙ and appears to be gravitationally bound. Furthermore, of the nine substructures examined here, one substructure (B1-E2) appears to be itself bound. The substructures are typically less than a Jeans length from their nearest neighbour and thus, may interact on a timescale of ~1 Myr. We propose that B1-E may be forming a first generation of dense cores, which could provide important constraints on the initial conditions of prestellar core formation. Our results suggest that B1-E may be influenced by a strong, localized magnetic field, but further observations are still required.
Key words: stars: formation / dust, extinction / ISM: individual objects: Perseus B1-E
© ESO, 2012
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