Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.7416r&link_type=abstract
American Astronomical Society Meeting 207, #74.16; Bulletin of the American Astronomical Society, Vol. 37, p.1286
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent high resolution bispectrum speckle interferometric observations in the near-infrared have revealed that the area surrounding NGC 7538 IRS1 is associated with a fan-like region that contains several stars and regions of diffuse emission. An interpretation of the speckle, CO, and methanol maser data, which shows the current position angle of the protostar's accretion disk on the sky, is of a jet with a large precession angle. Here, we run a molecular jet simulation with a similarly wide precession angle. We analyze the simulation for properties associated with the flow and the calculated emission. We can reproduce the ``older" average position angle for the CO emission, compared with a more recent value from molecular hydrogen (i.e., shocked gas) emission (which we use as a proxy for the K' band emission). Thus, the model is consistent with the interpretation that a precessing jet is responsible for much of the molecular emission (covering different emission lines) in the IRS1 region.
Kraus Sarit
Rosen Alexander
Smith Masson D.
Weigelt Gerd
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