Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333...38b&link_type=abstract
Astronomy and Astrophysics, v.333, p.38-42 (1998)
Astronomy and Astrophysics
Astrophysics
9
Galaxies: Individual: Mkn 231, Ngc 520, Ngc 6240, Arp 299, Galaxies: Ism, Radio Continuum: Galaxies
Scientific paper
We have observed several infrared-luminous galaxies which are in the process of merging (Mkn 231, Arp 299, NGC 6240, NGC 520, and IRAS 17208-0014) at 1.2mm with the multi-channel bolometer at the IRAM 30-meter telescope. Such observations of the long-wavelength thermal dust emission provide an alternative to CO as a measure of the gas mass. Comparing the masses of gas determined from the dust emission and from CO observations of these galaxies, we find that the conversion factor N(H_2) / I_CO(1-0) < 0.5 1020 \cm2 (\K\kms)^{-1}. Our calculations are conservative. We have chosen a \nu^2 emissivity; other emission laws result in higher dust temperatures. We have made our calculations assuming a metallicity of 2 Z_\odot$, which is low for a galactic nucleus. We have not assumed any enhancement of the dust emission through agglomeration of dust particles nor destruction of grains. Finally, we have assumed that all of the gas associated with 1.2mm thermal dust emission is molecular. Expected deviations from these assumptions would all decrease the gas masses estimated from the thermal dust emission, resulting in even lower values for the N(H_2) / I_CO conversion factor.
Braine Jonathan
Dumke Michael
No associations
LandOfFree
Millimeter-wave thermal dust emission from luminous mergers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Millimeter-wave thermal dust emission from luminous mergers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Millimeter-wave thermal dust emission from luminous mergers will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1362900