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Title:
The Molecular Emission of the Irradiated Star-Forming Core Ahead of HH 80N
Authors:
Masqué, Josep M.; Girart, Josep M.; Beltrán, Maria T.; Estalella, Robert; Viti, Serena
Affiliation:
AA(Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Catalunya, Spain), AB(Institut de Ciències de l'Espai (CSIC-IEEC), Campus UAB, Facultat de Ciències, Torre C5-parell 2, 08193 Bellaterra, Catalunya, Spain), AC(Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Catalunya, Spain), AD(Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Catalunya, Spain), AE(Department of Physics and Astronomy, University College London, London WC1E 6BT, UK)
Publication:
The Astrophysical Journal, Volume 695, Issue 2, pp. 1505-1516 (2009). (ApJ Homepage)
Publication Date:
04/2009
Origin:
IOP
Astronomy Keywords:
ISM: abundances, ISM: individual: HH 80N, ISM: molecules, radio lines: ISM, stars: formation
DOI:
10.1088/0004-637X/695/2/1505
Bibliographic Code:
2009ApJ...695.1505M

Abstract

We present a Berkeley-Illinois-Maryland Association Array molecular survey of the star-forming core ahead of HH 80N, the optically obscured northern counterpart of the Herbig-Haro objects HH 80/81. Continuum emission at 1.4 mm and 8 μm is detected at the center of the core, which confirms the presence of an embedded very young stellar object in the core. All detected molecular species arise in a ringlike structure, which is most clearly traced by CS (2-1) emission. This molecular ring suggests that strong molecular depletion occurs in the inner part of the core (at a radius of sime0.1 pc and densities higher than ~5 × 104 cm-3). Despite the overall morphology and kinematic similarity between the different species, there is significant molecular differentiation along the ringlike structure. The analysis of the chemistry along the core shows that part of this differentiation may be caused by the UV irradiation of the nearby HH 80N object that illuminates the part of the core facing HH 80N, which results in an abundance enhancement of some of the detected species.
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