Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adil...tw...01w&link_type=abstract
NCSA Astronomy Digital Image Library
Astronomy and Astrophysics
Astronomy
Scientific paper
NGC 2024 has been imaged in the J=1-0 line of C(18)O and in the continuum at a wavelength of 2.7 mm with a spatial resolution of approximately 10features found in previous studies. A 160 mJy point source coincides with the position of IRS 2. When the flux density at 2.7 mm is combined with those at 6 cm and 1.3 cm, we find that the flux density of this source depends on frequency, nu, as nu(1.3). The positions of the other three continuum sources agree very well with the positions of the 1.3 mm sources FIR 3, 5, and 6, given by Mezger et al. (1988, 1992). Combining the 2.7 and 1.3 mm flux densities, we find that flux density shows a dependence >= nu(4). Using our upper limits to the 2.7 mm continuum flux densities at the positions of FIR 1, 2, 4 and 7, we obtain a similar dependence. C(18)O emission is found in 3 slightly extended regions. The two southern peaks are offset from the positions of FIR 5 and FIR 6. The northern peak is located <= 4" from the position of FIR 2. For the C(18)O clouds, H2 column densities from the virial theorem give (CO/H2) ratios of approximately 10(-5), about 10 percent of the normally used value.
Dickel Helene R.
Mehringer David Michael
Wilson Thomas L.
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