Survey of local CO emission toward compact extragalactic millimeter-wave continuum sources and implications for local galactic structure

Details Survey of local CO emission toward compact extragalactic millimeter-wave continuum sources and implications for local galactic structure Survey of local CO emission toward compact extragalactic millimeter-wave continuum sources and implications for local galactic structure

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...429..638l&link_type=abstract

The Astrophysical Journal, vol. 429, no. 2, pt. 1, p. 638-644

Astronomy and Astrophysics

Astrophysics

21

Carbon Isotopes, Carbon Monoxide, Continuous Radiation, Galactic Structure, Intergalactic Media, Line Spectra, Millimeter Waves, Molecular Clouds, Radio Emission, Antennas, Data Integration, Extrapolation, Luminosity, Radio Telescopes, Spectral Resolution

Scientific paper

Continuing the quest for lines of sight suitable for millimeter-wave absorption studies of local molecular clouds, we searched for galactic CO J = 1 - 0 line emission toward some 110 compact extragalactic millimeter-wave continuum sources. Together with our earlier survey, we have examined a total of 220 objects with contemporary fluxes of 0.5 Jy or more, essentially the full ensemble of such sources north of -30 deg declination. This work adds seven directions (for a total of 16), and 13 components (totaling 23) to the list of absorption-line candidates, although emission along two directions had been presented previously. Both our source list and the set of inverted-spectrum very large array (VLA) calibrators strongly avoid the galactic plane. The total (12)CO integrated intensity is again found to be quite small compared to extrapolations of large-scale surveys at low latitudes, but this can now be attributed to the nearly complete absence of emission at b greater than 20 deg. This reflects a approximately equals 200 pc local hole in the local neutral gas. At lower latitudes, the discrepancy is less than a factor 2 and the mean free path for local clouds is not very large (approximately 1.4 kpc).

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