In this Letter, we present the first results from updated models of interstellar deuterium chemistry that now include all possible deuterated isotopomers of . We find that in regions of high density and heavy depletion, such as H3 prestellar cores, the inclusion of HD and D enhances the fractionation of ionic and neutral species significantly. 2 3 Our models are the first to predict the very hi...

The propagation of a shock wave into an interstellar medium is investigated by two-dimensional numerical hydrodynamic calculation with cooling, heating and thermal conduction. We present results of the high-resolution two-dimensional calculations to follow the fragmentation due to the thermal instability in a shock-compressed layer. We find that geometrically thin cooling layer behind the shock...

Context. Infrared (IR) spectra provide a prime tool to study the characteristics of polycyclic aromatic hydrocarbon (PAH) molecules in regions of star formation. Herbig Ae/Be stars are a class of young pre-main sequence stellar objects of intermediate mass. They are known to have varying amounts of natal cloud material still present in their direct vicinity. Aims. We characterise the IR emissio...

We combine Herschel observations of a total of 12 sources to construct the most uniform survey of HF and H2O in our Galactic disk. Both molecules are detected in absorption along all sight lines. The high spectral resolution of the Heterodyne Instrument for the Far-Infrared (HIFI) allows us to compare the HF and H2O distributions in 47 diffuse cloud components sampling the disk. We find that th...

We report on laboratory measurements of molecular hydrogen formation and recombination on an olivine slab as a function of surface temperature under conditions relevant to those encountered in the interstellar medium. On the basis of our experimental evidence, we recognize that there are two main regimes of H coverage that are of astrophysical importance; for each of them we provide an expressi...

Stars at the end of their lives return much of their mass back to the ISM. This process is the main source of dust in the ISM, and potentially a source of large molecules. I discuss several areas where SKA will have major impact on our understanding of the mass loss and the circumstellar processes. The resulting requirements for SKA, including frequency coverage and location, are discussed.

A previously developed interacting segment model [ISM-see J. Chern. Phys. 67, 2109 (1977)] is applied to a full-scale treatment of the electric dipole moments, isotropic and anisotropic polarizabilities, and hyperpolarizabilities of a series of t 2 halogenated methane molecules CXn Y 4-n(X, Y = H,F ,Ct; n = 0-4). The ISM scheme enables the molecular properties considered to be fitted in terms o...

We investigate the far infrared spectrum of NGC 1266, a S0 galaxy that contains a massive reservoir of highly excited molecular gas. Using the SPIRE-FTS, we detect the CO ladder up to J=(13-12), [C I] and [N II] lines, and also strong water lines more characteristic of UltraLuminous IR Galaxies (ULIRGs). The CO line emission is modeled with a combination of a low-velocity C-shock and a PDR. Sho...

We report the detection of fully resolved absorption lines of A−X bands from interstellar CO and CO, through high-resolution spectroscopy of X Per with the Space Telescope Imaging Spectrograph. The first ultraviolet measurement of an interstellar CO column density shows that its isotopomeric ratio is CO/CO = 8700 ± 3600. Simultaneously, the second ultraviolet detection of interstellar CO establ...

The biological molecules delivered to Earth on the board of meteorites and comets were called one possible causes origin life. Therefore, our understanding routes formation biomolecules in space should shed light possibility existence habitable extrasolar planets. large abundance organic is found regions with lowest temperature. Different organics these areas suggested. In this article, we demo...