ar X iv : a st ro - p h / 05 10 21 8 v 1 7 O ct 2 00 5 Methanol masers : Reliable tracers of the early stages of high - mass star formation

ar X iv : a st ro - p h / 02 10 42 8 v 1 1 8 O ct 2 00 2 Star Clusters in Interacting Galaxies : The Case of M 51 Nate

ar X iv : a st ro - p h / 02 10 42 0 v 1 1 8 O ct 2 00 2 Extragalactic Globular Clusters in the Near - Infrared

Visual and near-infrared colours are used to identify intermediate-age globular cluster in early-type galaxies. In NGC 5846 and NGC 4365 colour-colour diagrams (V-I vs. V-K) reveal a sub-population in the globular cluster systems with an age much younger than the expected old populations (13-15 Gyr). A comparison with SSP models dates the formation of this younger population 2-7 Gyr back. Furth...

ar X iv : a st ro - p h / 05 10 08 7 v 1 4 O ct 2 00 5 Chemical telemetry of OH observed to measure interstellar magnetic fields

We present models for the chemistry in gas moving towards the ionization front of an HII region. When it is far from the ionization front, the gas is highly depleted of elements more massive than helium. However, as it approaches the ionization front, ices are destroyed and species formed on the grain surfaces are injected into the gas phase. Photodissociation removes gas phase molecular specie...

ar X iv : a st ro - p h / 05 10 48 3 v 1 1 7 O ct 2 00 5 Discovery of the Millisecond X - Ray Pulsar HETE J 1900 . 1 - 2455

We report the discovery of millisecond pulsations from the low-mass X-ray binary HETE J1900.1-2455 which was discovered by the detection of a type I X-ray burst by the High Energy Transient Explorer 2 (HETE-2). The neutron star emits coherent pulsations at 377.3 Hz and is in an 83.3 minute circular orbit with a companion with a mass greater than 0.016 M ⊙ and likely less than 0.07 M ⊙. The comp...

ar X iv : a st ro - p h / 04 07 16 1 v 1 8 J ul 2 00 4 H 2 Omegamasers : Accretion disks , jet interaction , outflows or massive star formation ?

The 25 years following the serendipitous discovery of megamasers have seen tremendous progress in the study of luminous extragalactic H2O emission. Singledish monitoring and high resolution interferometry have been used to identify sites of massive star formation, to study the interaction of nuclear jets with dense molecular gas and to investigate the circumnuclear environment of active galacti...