APEX, the Atacama Pathfinder EXperiment, has been successfully commissioned and is
operational. This novel submillimeter telescope is located at 5107 m altitude on Llano de …

Aims. In March 2008, the APEX facility instrument was installed on the telescope at the site
of Lliano Chajnantor in northern Chile. The main objective of the paper is to introduce the …

Context. There is a group of binary post-AGB stars that show conspicuous near-infrared
(NIR) excess, which is usually assumed to arise from hot dust in very compact possibly …

Context. We describe the new SEPIA345 heterodyne receiver channel installed at the
Atacama Pathfinder EXperiment (APEX) telescope, including details of its configuration …

Context. High levels of deuterium fractionation in gas-phase molecules are usually
associated with cold regions, such as prestellar cores. Significant fractionation ratios are …

Aims. The earliest phases of massive star formation are found in cold and dense infrared
dark clouds (IRDCs). Since the detection method of IRDCs is very sensitive to the local …

With the goal of deriving the physical and chemical conditions of star-forming regions in the
Large Magellanic Cloud (LMC), a spectral line survey of the prominent star-forming region N …

Context. Observations of dense molecular gas lie at the basis of our understanding of the
density and temperature structure of protostellar envelopes and molecular outflows. The …

The THz spectral regime provides a wide range of spectral lines that are invaluable probes
of star formation and AGN activity in galaxies both in the local Universe and at the earliest …

Context. In the past years, the H 2 D+ and D 2 H+ molecules have gained attention as
probes of cold and depleted dense molecular cloud cores. These ions are the basis of …