2 Millimeter Dust around NGC 7538, IRS 1, 2, and 3: I. Unfilled Structure of Dust Cloud

Details 2 Millimeter Dust around NGC 7538, IRS 1, 2, and 3: I. Unfilled Structure of Dust Cloud 2 Millimeter Dust around NGC 7538, IRS 1, 2, and 3: I. Unfilled Structure of Dust Cloud

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..821a&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.53, No. 5, pp.821-832

Astronomy and Astrophysics

Astronomy

7

Ism: Dust, Ism: H Ii Regions, Ism: Individual (Ngc 7538)

Scientific paper

A 2-mm continuum mapping observation around NGC 7538 -- IRS 1, 2, and 3 was made by the Nobeyama Bolometer Array (NOBA) with a spatial resolution of 12''. An extended source of ~32'' × 44'' (Δα × Δδ), having a hardly resolved central core structure, was observed. The core gives a flux density of 3.1 Jy +/- 1Jy, and is clearly identified with the free-free emission from the compact H II regions. A smooth and extended source gives an integrated flux density of 5 Jy +/- 1.5 Jy, and an intensity spectrum of ν3 - ν3.5 in the millimeter wave region. The fitting of a gray body function to the observational data shows that an absorption index, β, of 1.8-2.0, a dust filling factor, η, of 0.3-0.5, and a dust temperature, Td, of 34K-45K are reasonable parameters for this 2-mm extended dust. Astronomical silicate grains were examined for a dust model. The total dust mass and luminosity were obtained as Md ~= 0.85 × 102 Msolar and Ldsimeq 2.2 × 105 Lsolar, respectively. The extent of 2-mm dust emission partly coincides with those of the 100-μm map, of the 57-μm map, and of the total intensity of the wing parts of the CO (J=1-0) line emission of the region. The absorbing silicate dust layer must be distinct from the extended 2-mm dust, and must arise on smaller scales than the extended 2-mm dust.

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