We model the radio, optical, and X-ray emission for the afterglows of GRB 980703, 990123, 990510, and 991216, within the framework of relativistic jets, to determine the physical parameters of these afterglows. For the last three we find jet energies around 10 ergs and initial opening angles less than 3 deg. The external medium density obtained from fits to the data ranges from 10 cm to less th...

We report observations of gaseous methanol in an edge-on torus surrounding the young stellar object L1551 IRS5. The peaks in the torus are separated by ∼ 10,000 AU from L1551 IRS5, and contain ∼ 0.03 M⊕ of cold CH3OH. We infer that the CH3OH abundance increases in the outer part of the torus, probably as a result of methanol evaporation from dust grain surfaces heated by the shock luminosity as...

A key ingredient in understanding the dynamics of stellar outflows is their proper motion. We have used optical images in the [SII] emission at 6717/31 Å and the red Digitized Palomar Observatory Sky Survey (DSS) plates to determine the proper motion of HH 7-11 system and the optical knot of Cep E (HH 377). The DSS plate measurements span nearly 37 years for both HH 7-11 and HH 377 and have wid...

Relativistic jets are believed to have a substantial impact on the gas dynamics and evolution of interstellar medium (ISM) their host galaxies. In this paper, we aim draw link between simulations observable signatures jet-ISM interactions by analyzing emission morphology kinematics resulting from jet-induced shocks in simulated disc spherical systems. We find that laterally expanding forward sh...

Using the ASTE 10 m submillimeter telescope and the 1.4 m Infrared Survey Facility (IRSF), we performed an extensive outflow survey in the Orion Molecular Cloud -2 and -3 region. Our survey, which includes 41 potential star-forming sites, has been newly compiled using multi-wavelength data based on millimeterand submillimeter-continuum observations as well as radio continuum observations. From ...

Why do we study shocks ? Because they are there. Shocks ubiquitous in the interstellar medium (ISM), where constitute a major source of energy injection, together with photons and cosmic rays (CRs). Galactic shocks, converging flows at basis formation molecular clouds filaments, examples shocks. Shock waves also generated during birth, life death stars form jets protostellar outflows, stellar w...

A ring of dense molecular gas extending 2-7 pc orbits the supermassive black hole Sgr A* at the center of our Galaxy. Using the Green Bank Telescope, we detected water maser lines and both narrow (0.35 km s) and broad (30 50 km s) methanol emission from the molecular ring. Two of the strongest methanol lines at 44 GHz are confirmed as masers by interferometric observations. These class I methan...

We present maps of seven sources selected from Klaassen & Wilson (2007a) in SiO (J=8-7) and HCO and HCO (J=4-3) which were obtained using HARPB on the James Clerk Maxwell Telescope. We find that four out of our seven sources have infall signatures based on their HCO emission profiles. From our maps, we have determined the extent of both the outflowing and infalling regions towards these sources...

The dates of receipt and acceptance should be inserted later Key words hydrodynamics – galaxies: abundances – galaxies: dwarf – galaxies: evolution – ISM: clouds – ISM: jets and outflows We study the effects of clouds on the dynamical and chemical evolution of gas-rich dwarf galaxies, in particular focusing on two model galaxies similar to IZw18 and NGC1569. We consider both scenarios, clouds p...

Outflows up to 1500 km s −1 of atomic neutral hydrogen are detected in a growing number of radio galaxies. Outflows with similar velocities are also detected in ionized gas, suggesting a common origin for the extreme kinematics of these two phases of the gas. The high detection rate of such outflows in young (or restarted) radio sources appears to be related to the existence of a dense ISM arou...