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The blast survey of the vela molecular cloud: physical properties of the dense cores in vela-D
David Hughes
Acceso Abierto
Stars: formation
ISM: clouds
The Balloon-borne Large-Aperture Submillimeter Telescope (BLAST) carried out a 250, 350 and 500μm survey of the galactic plane encompassing the Vela Molecular Ridge, with the primary goal of identifying the coldest dense cores possibly associated with the earliest stages of star formation. Here we present the results from observations of the Vela-D region, covering about 4 deg², in which we find 141 BLAST cores. We exploit existing data taken with the Spitzer MIPS, IRAC and SEST-SIMBA instruments to constrain their (single-temperature) spectral energy distributions, assuming a dust emissivity index β = 2.0. This combination of data allows us to determine the temperature, luminosity and mass of each BLAST core, and also enables us to separate starless from proto-stellar sources. We also analyze the effects that the uncertainties on the derived physical parameters of the individual sources have on the overall physical properties of starless and proto-stellar cores, and we find that there appear to be a smooth transition from the pre- to the proto-stellar phase. In particular, for proto-stellar cores we find a correlation between the MIPS24 flux, associated with the central protostar, and the temperature of the dust envelope. We also find that the core mass function of the Vela-D cores has a slope consistent with other similar (sub)millimeter surveys.
The Astrophysical Journal
Público en general
Olmi, L., et al., (2009). The blast survey of the vela molecular cloud: physical properties of the dense cores in vela-D, The Astrophysical Journal. Vol.707(2):1-22
Versión aceptada
acceptedVersion - Versión aceptada
Appears in Collections:Artículos de Astrofísica

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