VLA 7mm Observations Toward the Pumping Heart of GGD27

Details VLA 7mm Observations Toward the Pumping Heart of GGD27 VLA 7mm Observations Toward the Pumping Heart of GGD27

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ans...325...11l&link_type=abstract

Astronomische Nachrichten, Vol. 325, Supplement 1, Short Contributions Presented at the Annual Scientific Meeting of the Astrono

Astronomy and Astrophysics

Astronomy

High-Mass Star Formation, Interferometry

Scientific paper

While more and more theoretical investigations point to the formation of massive stars via (non-)spherical accretion, direct observational evidence for accretion disks around young high-mass stars is not easy to obtain. Mostly, we still have to deal with more or less indirect hints for their existence. Here we report progress on our project to unveil the nature of the central source of GGD27, a well-studied region of massive star formation from centimeter to the X-ray wavelengths, also known as HH80-81. Previous studies have revealed a deeply embedded massive YSO (1.7 - 2.0 × 104 Lsun) in GGD27 that drives one of the largest stellar radio jets observed so far. The jet appears to be very well collimated which entails questions about the collimating structures. Furthermore, the source illuminates a splendiferous NIR reflection nebula while it remains invisible at wavelengths < 3 μm. Both facts are indications for a non-spherical mass distribution around this central source. We used the VLA in its B configuration at a wavelength of 7 mm to scrutinise the central source on linear scales of < 300 AU. The data were obtained by applying a maser cross calibration technique using strong 44 GHz methanol masers in the vicinity of GGD27. Compared to our previous 1.3 cm data with similar resolution, we find a clear change in deconvolved position angle for the central source. This provides strong evidence for the existence of a circumstellar structure clearly inclined wrt the jet axis. We discuss or findings which imply that GGD27 is a premium candidate for a circumstellar disk around a young massive star. We demonstrate the need for still higher spatial resolution. Furthermore, we present first results of our efforts to obtain complementary high-resolution data in the thermal infrared.
H.L. and B.S. have been supported by DFG grant Ste 605/17-2. P.H. acknowledges partial support from the Research Corporation grant No CC4996, as well as from NSF grant AST-0098524.

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