ABSTRACT Both the CO(2–1) and CO(1–0) lines are used to trace mass of molecular gas in galaxies. Translating estimates between studies using different requires a good understanding behaviour CO(2–1)-to-CO(1–0) ratio, R21. We compare new, high-quality data from IRAM 30-m EMIR MultiLine Probe ISM Regulating Galaxy Evolution survey latest available maps HERA CO-Line Extragalactic Survey, Physics a...

Context. A wealth of observations of CO in absorption in diffuse clouds has accumulated in the past decade at uv and mm-wavelengths Aims. Our aims are threefold: a) To compare the uv and mm-wave results; b) to interpret 13CO and 12CO abundances in terms of the physical processes which separately and jointly determine them; c) to interpret observed J=1-0 rotational excitation and line brightness...

Context. HH 30 is a well-known Pre-Main-Sequence star in Taurus. HST observations have revealed a flared, edge-on disk driving a highly-collimated optical jet, making this object a case study for the disk-jet-outflow paradigm. Aims. We searched for a molecular outflow, and attempted to better constrain the star and disk parameters. Methods. We obtained high angular resolution (∼ 1′′) observatio...

Nine H ii regions of the LMC were mapped in 13CO(1–0) and three in 12CO(1–0) to study the physical properties of the interstellar medium in the Magellanic Clouds. For N113 the molecular core is found to have a peak position which differs from that of the associatedH ii regionby20′′. Toward this molecular core the 12CO and 13CO peak TMB line temperatures of 7.3K and 1.2K are the highest so far f...

We present a non-LTE Monte-Carlo radiative transfer code with clump and interclump media complementary to the one presented by Park et al. (1996) and derived from the original homogeneous model by Bernes (1979). The main difference is that instead of representing a very few real clumps treated individually, we consider an arbitrary large number of clumps, which we treat statistically with only ...