1998/12/09 by Karl M. Menten, Christopher L. Carilli, Mark J. Reid
Physics and Astronomy · #astro-ph
published as Highly Redshifted Radio Lines, eds. Carilli, Radford, Menten, and Langston, (San Francisco: PASP), 1999 · postscript file
arxiv created 1998/12/09 · arxiv updated 2009/12/01
We have made radio- and millimeter-wavelength interferometric observations of a variety of molecular absorption lines toward the gravitational lens systems B0218+357 and PKS1830-211. The absorption occurs in the lensing galaxies at redshifts of 0.685 and 0.89, respectively. The high spatial resolution of our VLA and VLBA observations allows imaging of the background continuum emission and the absorption distribution. Our multi-transition studies yield estimates of the cosmic microwave background temperature at z = 0.89 and determinations of molecular and isotopic abundance ratios, which allow meaningful comparisons with Galactic molecular clouds.