This Letter presents CO , CO , CO , and CO spectra of the irregular J p 3–2 J p 3–2 J p 3–2 J p 2–1 starburst galaxy M82 taken with the 15 m James Clerk Maxwell Telescope. All maps exhibit a double-peaked morphology, despite evidence that the higher J transitions are optically thick. This morphology suggests that the double-peaked structure is not the result of an edge-on torus of molecular gas...

We present the first results of AKARI Infrared Camera near-infrared spectroscopic survey of the Large Magellanic Cloud (LMC). We detected absorption features of the H2O ice 3.05μm and the CO2 ice 4.27μm stretching mode toward seven massive young stellar objects (YSOs). These samples are for the first time spectroscopically confirmed to be YSOs. We used a curve-of-growth method to evaluate the c...

We present experimental measurements of photodesorption from ices of astrophysical relevance. Layers of benzene and water ice were irradiated with a laser tuned to an electronic transition in the benzene molecule. The translational energy of desorbed molecules was measured by time-of-flight (ToF) mass spectrometry. Three distinct photodesorption processes were identified: a direct adsorbate-med...

Nine successive rotational lines in the ground vibrational state of CS and C34S between 96 GHz (J 1⁄4 2 1) and 500 GHz (10–9) were measured in the laboratory to an accuracy of a few kHz. When our measurements are combined with the submillimeter-wave measurements of Ahrens & Winnewisser, the entire rotational spectrum of both isotopic species is predicted to an accuracy of about 1 part in 108 up...

The demands for automobiles increased drastically in last two and half decades in India. Many global automobile manufacturers and Tier-1 suppliers have already set up research, development and manufacturing facilities in India. The Indian automotive component industry started implementing Lean practices to fulfill the demand of these customers. United Nations Industrial Development Organization...

Abstract Chemistry plays a key role in many aspects of astrophysical fluids. Atoms and molecules are agents for heating cooling, determine the ionization fraction, serve as observational tracers, build molecular foundation life. We present implementation chemistry module publicly available magnetohydrodynamic code Athena++ . implement several chemical networks cooling processes suitable simulat...

The molecular evolution that occurs in collapsing prestellar cores is investigated. To model the dynamics, we adopt the Larson-Penston solution and analogues with slower rates of collapse. For the chemistry, we utilize the new standard model (NSM) with the addition of deuterium fractionation and grain-surface reactions treated via the modified rate approach. The use of surface reactions disting...

New measurements of C/C ratios in Galactic molecular clouds have been conducted using the N 1⁄4 1 ! 0 transition of the CN radical. This species is unique in that it has extensive hyperfine structure that can be accurately used to correct for line saturation effects. Combined with the past observations of Savage and coworkers, the ratios derived from CN are the most extensive data set to date f...

We examine 20 diffuse and translucent Galactic sight lines and extract the column densities of the CO and CO isotopologues from their ultraviolet A–X absorption bands detected in archival Space Telescope Imaging Spectrograph data with λ/∆λ ≥ 46,000. Five more targets with Goddard High-Resolution Spectrograph data are added to the sample that more than doubles the number of sight lines with publ...

Near-infrared spectra (0.95 – 2.4 μm) of the peculiar Type IIn supernova 1998S in NGC 3877 from 95 to 355 days after maximum light are presented. K -band data taken at days 95 and 225 show the presence of the first overtone of CO emission near 2.3 μm, which is gone by day 355. An apparent extended blue wing on the CO profile in the day 95 spectrum could indicate a large CO expansion velocity (≈...