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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 358807.0, MPI für Astronomie / Publikationen_mpia
A massive protostellar core with an infalling envelope
Authors:Birkmann, S. M.; Krause, O.; Hennemann, M.; Henning, T.; Steinacker, J.; Lemke, D.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Astronomy and Astrophysics
Start Page:883
End Page:890
Audience:Not Specified
Abstract / Description:Context: Due to the short timescales involved and observational difficulties, our knowledge of the earliest phases of massive star formation remains incomplete. Aims: We aim to explore the physical conditions during the initial phases of high-mass star formation and to detect a genuine massive (mass M > 8 M_o) protostar at an early evolutionary stage. Methods: We have launched a multi-wavelength study of young and massive star-forming regions that were identified by the ISOPHOT Serendipity Survey (ISOSS) performed with the ISO space telescope. The follow-up observations include ground-based near-infrared imaging and (sub)mm continuum and molecular line measurements (both single-dish and interferometric), as well as mid- to far-infrared measurements with the Spitzer Space Telescope. The combined spectrophotometric data are used to determine source temperatures T and masses M. Results: <ASTROBJ>ISOSS J23053+5953</ASTROBJ> is a massive (M ~ 900 M_o, luminosity L ~ 2100 L_o) and cold (T ~ 17 K) star-forming region with two protostellar/protocluster candidates (T ⪉ 20 K and T ~ 17.5 K, M ~ 200 M_o each). The low temperatures are strongly confined by the spectrophotometric Spitzer data in the FIR. Interferometric observations reveal that the colder core (SMM2) has a mass of M = 26 M_o within a region of 8700 × 5600 AU and drives an outflow. It also shows signs of infall in both single-dish and interferometric measurements, and its luminosity can be explained by accretion. We also detect a large-scale jet that is traced by H2 emission. Conclusions: The cold mm-core <ASTROBJ>ISOSS J23053+5953 SMM2</ASTROBJ> is a promising candidate for a high-mass protostar in an early evolutionary stage and one of the few objects showing both infall signatures and jets as a sign of accretion. Plateau de Bure FITS data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/474/883
Free Keywords:ISM: individual objects: ISOSS J23053+5953; stars: formation; ISM: jets and outflows; infrared: ISM; ISM: kinematics and dynamics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie

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