A5040793539- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Molecular Spectroscopy and Structure
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- History and Developments in Astronomy
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Space Exploration and Technology
- Atomic and Molecular Physics
- Astrophysical Phenomena and Observations
- Historical Astronomy and Related Studies
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Particle accelerators and beam dynamics
- Mass Spectrometry Techniques and Applications
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Astrophysics and Cosmic Phenomena
AlbaNova
2004-2020
Stockholm University
2011-2020
Astronomical Observatory
2007
Swedish Polar Research Secretariat
1976-1987
Queen's University
1963
We report observations of three rotational transitions molecular oxygen (O2) in emission from the H2 Peak 1 position vibrationally excited hydrogen Orion. observed 487 GHz, 774 and 1121 GHz lines using HIFI on Herschel Space Observatory, having velocities 11 km s-1 to 12 widths 3 s-1. The beam-averaged column density is N(O2) = 6.5\times1016 cm-2, assuming that source has an equal beam filling factor for all (beam 44, 28, 19"), relative line intensities imply a kinetic temperature between 65...
The presence of numerous complex organic molecules (COMs; defined as those containing six or more atoms) around protostars shows that star formation is accompanied by an increase molecular complexity. These COMs may be part the material from which planetesimals and, ultimately, planets formed. Comets represent some oldest and most primitive in solar system, including ices, are thus our best window into volatile composition protoplanetary disk. Molecules identified to present cometary ices...
In September 2002 the Antarctic polar vortex split in two under influence of a sudden warming. During this event, Odin satellite was able to measure both ozone (O 3 ) and chlorine monoxide (ClO), key constituent responsible for so‐called “ozone hole”, together with nitrous oxide (N 2 O), dynamical tracer, nitric acid (HNO nitrogen dioxide (NO ), tracers denitrification. The submillimeter radiometer (SMR) microwave instrument Optical Spectrograph Infrared Imager System (OSIRIS) UV‐visible...
Context.Molecular oxygen, O2, has been expected historically to be an abundant component of the chemical species in molecular clouds and, as such, important coolant dense interstellar medium. However, a number attempts from both ground and space have failed detect O2 emission.
We report the first detection of chloronium, H$_2$Cl$^+$, in interstellar medium, using HIFI instrument aboard \emph{Herschel} Space Observatory. The $2_{12}-1_{01}$ lines ortho-H$_2^{35}$Cl$^+$ and ortho-H$_2^{37}$Cl$^+$ are detected absorption towards NGC~6334I, $1_{11}-0_{00}$ transition para-H$_2^{35}$Cl$^+$ is NGC~6334I Sgr~B2(S). H$_2$Cl$^+$ column densities compared to those chemically-related species HCl. derived HCl/H$_2$Cl$^+$ density ratios, $\sim$1--10, within range predicted by...
Using the Herschel Space Observatory's Heterodyne Instrument for Far-Infrared (HIFI), we have observed para-chloronium (H2Cl+) toward six sources in Galaxy. We detected interstellar chloronium absorption foreground molecular clouds along sight-lines to bright submillimeter continuum Sgr A (+50 km/s cloud) and W31C. Both para-H2-35Cl+ para-H2-37Cl+ isotopologues were detected, through observations of their 1(11)-0(00) transitions at rest frequencies 485.42 484.23 GHz, respectively. For an...
Four more cometary globules have been found in the outskirts of Gum Nebula with their tails pointing away from centre complex. Cometary may belong to same class objects as teardrops seen Rosette Nebula.
view Abstract Citations (48) References (50) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The evolution of star-bearing molecular clouds : the high-velocity HCO+ flow in NGC 2071. Wootten, A. ; Loren, R. B. Sandqvist, Friberg, P. Hjalmarson, Observations 2071 J = 1-0 and 3-2 lines HCO(+) H(C-13)O(+) obtained with 11-m NRAO antenna at Kitt Peak 20-m mm-wave Onsala Space Observatory (J 1-0) 4.9-m Millimeter Wave 3-2) during 1980-1983 are reported discussed...
Strong emission in the 2 cm J-1K/sub 1/ =2/sub 12/--2/sub 11/ line of H/sub 2/CO has been found rho Oph dark cloud (rho B). Previously this detected only warm (T/sub K/>50 K) clouds OMC-1 and OMC-2. Densities excess 10/sup 6/ cm/sup -3/ are required to drive into emission. The mm 12/--1/sub ortho-H/sub at B appears be self-reversed when compared optically thin lines (e.g., 2//sup 13/CO). dense core a mass approx.100 M/sub sun/ an extinction A/sub v/>200 mag similar or OMC-2, but differs from...
view Abstract Citations (19) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Anisotropic scattering in dark clouds and formaldehyde lifetimes. Bernes, C. ; Sandqvist, A. The ray-tracing technique for solving radiative-transfer problems spherical symmetry is used to develop a procedure determining the radiation intensity models of exposed interstellar field and/or from embedded stars. To this end, source function that includes anisotropic has...