Aperture synthesis CS observations of NGC 7538 IRS 1-3 - Ring of dense gas around IRS 1

Details Aperture synthesis CS observations of NGC 7538 IRS 1-3 - Ring of dense gas around IRS 1 Aperture synthesis CS observations of NGC 7538 IRS 1-3 - Ring of dense gas around IRS 1

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..435k&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 4, p. 435-446.

Astronomy and Astrophysics

Astronomy

15

Early Stars, Infrared Sources (Astronomy), Interstellar Matter, Molecular Gases, Nebulae, Emission Spectra, Interstellar Gas, Molecular Flow, Stellar Envelopes

Scientific paper

We have carried out aperture synthesis CS (J = 2-1) observations of the dense molecular gas around a young stellar object NGC 7538 IRS 1-3 with 6 arcsec resolution using the Nobeyama Millimeter Array. We have found that the dense molecular gas has a ring-like structure contered on an infrared source NGC 7538 IRS 1. The ring has a diameter of 20 arcsec and an H2 mass of 230 solar masses. The velocity structure of CS (2-1) emission indicates the existence of an expanding motion of the ring (V(exp) about 1 km/s/sini, where i is the inclination angle of the ring). These results suggest that the observed structure is a nearly face-on view of a protostellar disk of molecular gas with a central hole formed by wind from IRS 1. IRS 2 and IRS 3 are apparently on the ring. In addition to the structure, several clumps of dense gas have been found around the ring. These clumps have a typical size of 10 arcsec and a velocity dispersion of 1-2 km/s; the H2 masses range from 20 to 60 solar masses. It is suggested that these clumps are gravitationally bound, and would be protostellar condensations.

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