The density, the cosmic microwave background, and the proton-to-electron mass ratio in a cloud at redshift 0.9
The density, the cosmic microwave background, and the proton-to-electron mass ratio in a cloud at redshift 0.9
Based on measurements with the Effelsberg 100-m telescope, a multi-line study of molecular species is presented toward the gravitational lens system PKS1830-211. Obtaining average radial velocities and performing Large Velocity Gradient radiative transfer calculations, the aims of this study are (1) to determine the density of the gas, (2) to …