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To understand the environment and extended structure of the host galactic gaswhose molecular absorption line chemistry, we previously observed along themicroscopic line of sight to the blazar/radiocontinuum source NRAO150 (akaB0355+508), we used the IRAM 30m Telescope and Plateau de Bure Interferometerto make two series of images of the host gas: i) 22.5 arcsec resolutionsingle-dish maps of 12CO J=1-0 and 2-1 emission over a 220 arcsec by 220 arcsecfield; ii) a hybrid (interferometer+singledish) aperture synthesis mosaic of12CO J=1-0 emission at 5.8 arcsec resolution over a 90 arcsec-diameter region.CO components that are observed in absorption at a moderate optical depth (0.5)and are undetected in emission at 1 arcmin resolution toward NRAO 150 remainundetected at 6 arcsec resolution. This implies that they are not apreviously-hidden large-scale molecular component revealed in absorption, butthey do highlight the robustness of the chemistry into regions where thedensity and column density are too low to produce much rotational excitation,even in CO. Bright CO lines around NRAO150 most probably reflect the variationof a chemical process, i.e. the C+-CO conversion. However, the ultimate causeof the variations of this chemical process in such a limited field of viewremains uncertain.

Imaging galactic diffuse gas: Bright, turbulent CO surrounding the line of sight to NRAO150