Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348l..45k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. L45-L48.
Astronomy and Astrophysics
Astrophysics
1
Formaldehyde, H Ii Regions, Interstellar Gas, Relic Radiation, Very Large Array (Vla), Hydrogen Clouds, Molecular Clouds, Red Shift
Scientific paper
Absorption of orthoformaldehyde (H2CO) toward the giant H II region W51A (G49.5 - 0.4) has been used as a remote probe of the cosmic microwave background (CMB) at a distance of 7.5 kpc. VLA observations of the 6 cm and 2 cm wavelength transitions provided sufficient resolution and sensitivity to resolve condensations within the foregound clouds. Solutions to the equations of statistical equilibrium within each condensation in the context of a large velocity gradient model yielded an estimate for the CMB temperature at 2.1 mm wavelength of 3.2 + or - 0.9 K. The uncertainty is dominated by modeling of collisional pumping by neutral hydrogen molecules (H2).
Bennett Charles L.
Kogut Alan
Petuchowski Sam J.
Smoot George F.
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