Herschel observations of a potential core-forming clump: Perseus B1-E
Bernard, J. -P.; Hill, T.; White, G. J.; André, Ph.; Testi, L.; Schneider, N.; Bontemps, S.; Peretto, N.; Motte, F.; Pezzuto, S.; Sadavoy, S. I.; Hennemann, M.; Nguyen Luong, Q.; Fallscheer, C.; Bressert, E.; di Francesco, J.; Martin, P.; Wilson, C.; Chitsazzadeh, S.; Reid, M.
Canada, France, Italy, Germany, United Kingdom
Abstract
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.