A5043677695- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Spectroscopy and Laser Applications
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Atomic and Molecular Physics
- History and Developments in Astronomy
- Gamma-ray bursts and supernovae
- Planetary Science and Exploration
- Antenna Design and Optimization
- Galaxies: Formation, Evolution, Phenomena
- Solar and Space Plasma Dynamics
- Superconducting and THz Device Technology
- Space Science and Extraterrestrial Life
- Spacecraft and Cryogenic Technologies
- Ionosphere and magnetosphere dynamics
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Advanced Chemical Physics Studies
Max Planck Institute for Radio Astronomy
2005-2022
Johnson Space Center
2005-2021
Max Planck Society
1990-2018
Division of Astronomical Sciences
2017
U.S. National Science Foundation
2017
United States Naval Research Laboratory
1993-2016
Commonwealth Scientific and Industrial Research Organisation
2014-2016
Astronomy and Space
2014-2016
European Organization for Nuclear Research
2013-2015
Oak Ridge National Laboratory
2011
My life has been an interesting voyage. I became astronomer because could not imagine living on Earth and trying to understand how the Universe works. scientific career revolved around observing motions of stars within galaxies ...Read More
Measurements of the present-day abundances elements and isotopes, combined with model calculations, allow us to trace history nucleosynthesis in universe. Throughout this review, emphasis will be placed on descriptions measurement processes interpretations needed obtain actual isotope element from measurements. Comparisons isotopomers a given are less affected by systematic effects than comparisons different elements. Thus ratios should greater weight when data models compared.
We perform a census of the reddest, and potentially youngest, protostars in Orion molecular clouds using data obtained with PACS instrument onboard Herschel Space Observatory LABOCA SABOCA instruments on APEX as part Protostar Survey (HOPS). A total 55 new protostar candidates are detected at 70 um 160 that either too faint (m24 > 7 mag) to be reliably classified or undetected Spitzer/MIPS 24 band. find 11 reddest log (lambda F_lambda 70) / 24) 1.65 free contamination can thus explained...
We present far-infrared (57–196 μm) spectra of 21 protostars in the Orion molecular clouds. These were obtained with Photodetector Array Camera and Spectrometer (PACS) on board Herschel Space observatory as part Protostar Survey program. analyzed emission lines from rotational transitions CO, involving quantum numbers range Jup = 14–46, using PACS extracted within a projected distance ≲2000 AU centered protostar. The total luminosity CO observed (LCO) is found to increase increasing...
We report the dramatic mid-infrared brightening between 2004 and 2006 of HOPS 383, a deeply embedded protostar adjacent to NGC 1977 in Orion. By 2008, source became factor 35 brighter at 24 microns with brightness increase also apparent 4.5 microns. The outburst is detected submillimeter by comparing APEX/SABOCA SCUBA data, scattered-light nebula appeared NEWFIRM K_s imaging. post-outburst spectral energy distribution indicates Class 0 dense envelope luminosity 6 14 L_sun. Post-outburst...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of SilaneT. R. Hogness, Thomas L. Wilson, and Warren C. JohnsonCite this: J. Am. Chem. Soc. 1936, 58, 1, 108–112Publication Date (Print):January 1936Publication History Published online1 May 2002Published inissue 1 January 1936https://pubs.acs.org/doi/10.1021/ja01292a036https://doi.org/10.1021/ja01292a036research-articleACS PublicationsRequest reuse permissionsArticle Views2013Altmetric-Citations81LEARN ABOUT THESE...
This paper describes the system architecture of a newly constructed radio telescope - Boolardy Engineering Test Array, which is prototype Australian Square Kilometre Array Pathfinder telescope. Phased array feed technology used to form multiple simultaneous beams per antenna, providing astronomers with unprecedented survey speed. The test described here 6-antenna interferometer, fitted signal processing hardware capable forming at least 9 dual-polarisation simultaneously, allowing several...
The Herschel Orion Protostar Survey obtained well-sampled 1.2 - 870 micron spectral energy distributions (SEDs) of over 300 protostars in the molecular clouds, home to most young stellar objects (YSOs) nearest 500 pc. We plot bolometric luminosities and temperatures for 330 YSOs, 315 which have characteristic protostars. histogram temperature is roughly flat; 29% are Class 0. median luminosity decreases by a factor four with increasing temperature; consequently, 0 systematically brighter...
view Abstract Citations (81) References (58) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The 8.7 GHz hyperfine line of 3 He+ in galactic HII regions. Rood, R. T. ; Bania, M. Wilson, L. A search for the 3He+ H II regions has yielded detections three and significant upper limits others. authors derive 3He/H abundance ratios 4×10-5 W43, 1×10-4 W51, 5×10-4 W3. found are 6×10-5 Orion A, 2×10-5 W49 M17S. These abundances have been corrected (by up to a...
The two-component Sakata-Taketani (ST) spin-0 theory and the single-component Klein-Gordon are obtained from five-component Duffin-Kemmer-Petiau (DKP) with six types of external field interactions by means a Peirce decomposition. Whereas DKP equation manifests covariance, ST causal properties. In particular, presence noncausal wave propagation when there is coupling to second-rank tensor apparent form equation, in which coefficients all space derivatives depend on field. Our results indicate...
We used several data sets from the Plateau de Bure Interferometer to map dimethyl ether emission in Orion-KL with different arcsec spatial resolutions and energy levels compare our previous methyl formate maps. Our show remarkable similarity between (CH3OCH3) (HCOOCH3) distributions even on a small scale (1.8"x0.8" or about 500 AU). This long suspected similarity, seen both observational theoretical arguments, is demonstrated unprecedented confidence, correlation coefficient of maps 0.8. A...
Abstract We describe the performance of Boolardy Engineering Test Array, prototype for Australian Square Kilometre Array Pathfinder telescope. is first aperture synthesis radio telescope to use phased array feed technology, giving it ability electronically form up nine dual-polarisation beams. report methods developed forming and measuring beams, adaptations that have been made traditional calibration imaging procedures in order allow BETA function as a multi-beam commissioning instrument...
view Abstract Citations (106) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS VLBI Observations of the 6.7 GHz Methanol Masers toward W3(OH) Menten, K. M. ; Reid, J. Pratap, P. Moran, Wilson, T. L. We have conducted observations 6.668 maser transition interstellar methanol ultracompact H II region W3(OH). determined absolute positions with an accuracy 0.05 arcsec and produced maps that show masers a distribution similar to hydroxyl in this...
view Abstract Citations (78) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The NGC 7538 IRS 1 Region of Star Formation: Observations the H66 alpha Recombination Line with a Spatial Resolution 300 AU Gaume, R. A. ; Goss, W. M. Dickel, H. Wilson, T. L. Johnston, K. J. 1.3 cm continuum and recombination line emission toward have been imaged spatial resolution 180 AU, respectively. There are several remarkable aspects to data. core H II region...
The 500 central pc of the Galaxy (hereafter GC) exhibit a widespread gas component with kinetic temperature 100-200 K. bulk this is not associated to well-known thermal radio continuum or far infrared sources like Sgr A B. How heated has been longstanding problem. With aim studying balance neutral and dust in GC, we have observed 18 molecular clouds located at projected distances from Infrared Space Observatory (ISO). In paper present observations several fine structure lines full spectra...
We present ISO observations of several pure-rotational lines (from S(0) to S(5)) towards a sample 16 molecular clouds distributed along the central ∼500 pc Galaxy. also and these sources made with IRAM-30 m telescope. With CO data we derive densities 103.5-4.0 cm-3 column few 1022 cm-2. have corrected for ∼30 magnitudes visual extinction using self-consistent method. In every source, find that emission exhibits large temperature gradient. The S(1) trace temperatures (T) ∼150 K while S(4)...