Issue |
A&A
Volume 475, Number 3, December I 2007
|
|
---|---|---|
Page(s) | 925 - 939 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20077977 | |
Published online | 24 September 2007 |
Multi-line (sub)millimetre observations of the high-mass proto cluster IRAS 05358+3543*
1
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2
ESO, Karl-Schwarzschild Strasse 2, 85748 Garching-bei-München, Germany e-mail: sleurini@eso.org
3
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
4
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Received:
30
May
2007
Accepted:
20
September
2007
Context.Since most high- and intermediate-mass protostars are at great distance and form in clusters, high linear resolution observations are needed to investigate their physical properties.
Aims.To study the gas in the innermost region around the protostars in the proto-cluster IRAS 05358+3543, we observed the source in several transitions of methanol and other molecular species with the Plateau de Bure Interferometer and the Submillimeter Array, reaching a linear resolution of 1100 AU.
Methods.We determine the kinetic temperature of the gas around the protostars through an LVG and LTE analysis of their molecular emission; the column densities of CH3OH, CH3CN and SO2 are also derived. Constraints on the density of the gas are estimated for two of the protostellar cores.
Results.We find that the dust condensations are in various evolutionary stages. The
powerhouse of the cluster, mm1a, harbours a hot core with
K. A double-peaked profile is detected in several
transitions toward mm1a, and we found a velocity gradient along a linear
structure which could be perpendicular to one of the outflows from the
vicinity of mm1a. Since the size of the double-peaked emission is less
than 1100 AU, we suggest that mm1a might host a massive circumstellar
disk. The other sources are in earlier stages of star
formation. The least active source, mm3, could be a starless massive
core, since it is cold (
K), with a large reservoir of accreting
material (
), but no molecular emission peaks on it.
Key words: stars: formation / stars: early type / stars: individual: IRAS 05358+3543 / ISM: molecules
© ESO, 2007
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.