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astro-ph2000★ 64 cited
Astronomical Constraints on the Cosmic Evolution of the Fine Structure Constant and Possible Quantum Dimensions
C. L. Carilli, K. M. Menten, J. T. Stocke +6
We present measurements of absorption by the 21cm hyperfine transition of neutral hydrogen toward radio sources at substantial look-back times. These data are used in combination w…
astro-ph1998
High Redshift HI 21cm Absorption toward Red Quasars
C. L. Carilli, Karl M. Menten, C. P. Moore
We have searched for redshifted absorption in the 21 cm line of neutral hydrogen toward `red quasars', which are extragalactic radio sources with a steep spectral drop between opti…