Bispectrum speckle interferometry of the massive protostellar outflow source IRAS 23151+5912

Abstract

We present bispectrum speckle interferometry of the massive protostellar object IRAS 23151+5912 in the near-infrared K' band. The reconstructed image shows the diffuse nebulosity north-east of two point-like sources in unprecedented detail. The comparison of our near-infrared image with mm continuum and CO molecular line maps shows that the brighter of the two point sources lies near the center of the mm peak, indicating that it is a high-mass protostar. The nebulosity coincides with the blue-shifted molecular outflow component. The most prominent feature in the nebulosity is a bow-shock-like arc. We assume that this feature is associated with a precessing jet which has created an inward-pointed cone in the swept-up material. We present numerical jet simulations that reproduce this and several other features observed in our speckle image of the nebulosity. Our data also reveal a linear structure connecting the central point source to the extended diffuse nebulosity. This feature may represent the innermost part of a jet that drives the strong molecular outflow (PA ~80 degr) from IRAS 23151+5912. With the aid of radiative transfer calculations, we demonstrate that, in general, the observed inner structures of the circumstellar material surrounding high-mass stars are strongly influenced by the orientation and symmetry of the bipolar cavity.

accepted by Astronomy & Astrophysics; preprints with high-resolution images can be obtained from http://www.mpifr-bonn.mpg.de/staff/tpreibis/iras23151.html

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• A multi-wavelength study of a double intermediate-mass protostar - from large-scale structure to collimated jets
• Near-IR imaging towards a puzzling YSO precessing jet
• Multiple molecular outflows and fragmentation in the IRDC core G34.43+00.24 MM1
• Unveiling the circumstellar environment towards a massive young stellar object
• Study of the molecular and ionized gas in a possible precursor of an ultra-compact HII region
• Looking for evidence of high-mass star formation at core scale in a massive molecular clump
• Discovering a misaligned CO outflow related to the red MSX source G034.5964-01.0292