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Near-infrared imaging of RAFGL7009S

Abstract : RAFGL7009S is a deeply embedded massive young stellar objet (YSO) showing strong ice and saturated silicate absorption features in the mid infrared. It is associated with the ultracompact H  region G25.65+1.05, which may be excited by a B1V star. We have obtained JHK images of a 1 field centred on this YSO. In K we detect a non-resolved object coinciding with the radio continuum emission peak. Considering the high extinction towards this source (A V ≥ 100 mag), the observed K emission is more than 7 mag in excess of that expected for a B1V star. We suggest that this emission is mainly due to scattering of the central zone emission, as recently found for a sample of embedded massive YSOs associated with 3.1 µm H 2 O ice absorption (Ishii et al. 2002). We estimate the YSO's age to be 2×10 4 years. The outflow, the methanol maser emission and the strong ice absorption features suggest the presence of a dense medium very close to the star, possibly a disk.
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Submitted on : Wednesday, January 27, 2021 - 9:50:59 AM
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A. Zavagno, L. Deharveng, D. Nadeau, J. Caplan. Near-infrared imaging of RAFGL7009S. Astronomy and Astrophysics - A&A, EDP Sciences, 2002, 394 (1), pp.225-229. ⟨10.1051/0004-6361:20021129⟩. ⟨hal-02522420⟩

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