Formation of a massive protostar through disk accretion. II. SINFONI integral field spectroscopy of the M 17 silhouette disk and discovery of the associated H{2} jet

Details Formation of a massive protostar through disk accretion. II. SINFONI integral field spectroscopy of the M 17 silhouette disk and discovery of the associated H{2} jet Formation of a massive protostar through disk accretion. II. SINFONI integral field spectroscopy of the M 17 silhouette disk and discovery of the associated H{2} jet

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...465..931n&link_type=abstract

Astronomy and Astrophysics, Volume 465, Issue 3, April III 2007, pp.931-936

Astronomy and Astrophysics

Astrophysics

10

Stars: Early-Type, Stars: Formation, Stars: Pre-Main Sequence, Stars: Individual: M 17 Silhouette Disk, Ism: Individual Objects: M 17

Scientific paper

Context: Recent observational results suggest that high-mass (proto-)stars form in a similar way to low- and intermediate-mass stars, i.e., via disk accretion of gas and dust. Aims: To further characterize and understand the on-going physical processes associated with a large circumstellar disk, seen as a dark silhouette against the bright background of the M 17 H ii region, we report and discuss new high angular resolution integral field spectroscopy performed in the K-band. Methods: The data were taken with the Adaptive Optics (AO) supported near-infrared integral field spectrograph SINFONI at ESO's Very Large Telescope Yepun (VLT UT 4) as part of the science verification of this new instrument. Results: Based on obtained H{2} v = 1-0 S(1) and H{2} v = 1-0 S(3) emission maps, we report the discovery of a H{2} jet, which apparently arises from the suspected protostellar source(s) located at the very center of the disk. In addition, both diameter (about 4000 AU) and sub-structures of the innermost, densest part of the flared disk are infered from Br γ, Br δ, and He I maps. Conclusions: .Because ejection of material through a jet/outflow is always linked to accretion of gas and dust either onto the circumstellar disk or onto the central (protostellar) source(s), the presence of a collimated H{2} jet provides indirect but unquestionable evidence for ongoing accretion processes in the case of the M 17 disk. The high mass outflow and accretion rates of >10-5 M&sun; yr-1 derived from the SINFONI data suggest that a star of rather high mass is forming.
Based on observations performed at the European Southern Observatory Very Large Telescope on Cerro Paranal, Chile as part of the SINFONI science verification, program ID 60.A-9041(A). Obtained data sets are publicly available via the ESO archive http://archive.eso.org/eso/eso_archive_main.html

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