The carrier of the 2175 Å interstellar extinction feature remains unidentified since its first detection over 40 yr ago. In recent years, carbon buckyonions have been proposed as a carrier of this feature, based on the close similarity between the electronic transition spectra of buckyonions and the 2175 Å interstellar feature. We examine this hypothesis by modelling the interstellar extinction...

The doublet and quartet potential energy surfaces for the P + SO → PO S reaction are explored using highly accurate explicit correlation multireference configuration interaction method, is found to be thermodynamically favorable, with an exothermicity value of 70.5 kJ mol−1. electronic structure, spectra, bond dissociation energies intermediates involved in reaction, such as SPO, PSO, SOP, calc...

We report the first identification in space of H2NC, a high-energy isomer H2CN that has been largely ignored chemical and astrochemical studies. The observation various unidentified lines around 72.2 GHz cold dark cloud L483 motivated search for, successful detection of, additional groups harmonic relation. After an exhaustive high-level ab initio screening possible carriers, we confidently ass...

We survey the current situation regarding chemical modelling of the synthesis of molecules in the interstellar medium. The present state of knowledge concerning the V. Wakelam ( ) Observatoire Aquitain des Sciences de l’Univers, Université de Bordeaux, BP 89, 33271 Floirac Cedex, France e-mail: [email protected] V. Wakelam Laboratoire d’Astrophysique de Bordeaux, CNRS, UMR 5804, BP 89,...

Aims. We review the present observational knowledge on the spatial distribution and the physical state of the different (molecular, atomic and ionized) components of the interstellar gas in the innermost 3 kpc of our Galaxy – a region which we refer to as the interstellar Galactic bulge, to distinguish it from its stellar counterpart. Methods. We try to interpret the observations in the framewo...

ABSTRACT Hydroxylamine, NH2OH, is one of the already detected interstellar molecules with highest prebiotic potential. Yet, abundance this molecule found by astronomical observations rather low for a relatively simple molecule, ?10?10 relative to H2. This seemingly can be rationalized destruction routes operating on dust grains. In work, we tested viability hypothesis under several prisms, find...

In the early 1990s, after its Jupiter flyby, the Ulysses spacecraft identified interstellar dust in the solar system. Since then the in-situ dust detector on board Ulysses continuously monitored interstellar grains with masses up to 10−13 kg, penetrating deep into the solar system. While Ulysses measured the interstellar dust stream at high ecliptic latitudes between 3 and 5 AU, interstellar im...

Hydrogen is the most abundant element in the universe. For this reason, the chemistry of the interstellar medium is largely dominated by the interaction of hydrogenic neutrals and ions. The hydrogen molecule, H2, and the simplest polyatomic ion, H3 , each exist in one of two forms identified as ortho or para, which are defined by their total nuclear spins. These spin modifications have differen...

Hydrostatic equilibrium of the multiphase interstellar medium in the solar vicinity is reconsidered, with the regular and turbulent magnetic fields treated separately. The regular magnetic field strength required to support the gas is consistent with independent estimates provided energy equipartition is maintained between turbulence and random magnetic fields. Our results indicate that a midpl...