A5051618960- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Spectroscopy and Laser Applications
- Galaxies: Formation, Evolution, Phenomena
- Atomic and Molecular Physics
- Astrophysics and Cosmic Phenomena
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Green IT and Sustainability
- Molecular Spectroscopy and Structure
- Advanced MIMO Systems Optimization
- Particle Accelerators and Free-Electron Lasers
- Astronomical Observations and Instrumentation
- Calibration and Measurement Techniques
- Particle accelerators and beam dynamics
- Gas Dynamics and Kinetic Theory
- Advanced Wireless Network Optimization
- Laser Design and Applications
- Astrophysical Phenomena and Observations
- Cold Atom Physics and Bose-Einstein Condensates
- Adaptive optics and wavefront sensing
- Atomic and Subatomic Physics Research
Friedrich-Alexander-Universität Erlangen-Nürnberg
2017-2022
Intel (Germany)
2018
Friedrich Schiller University Jena
2012-2016
Leibniz Association
2010
Royal Observatory
1981-2007
UK Astronomy Technology Centre
1991-2007
University of Edinburgh
1996-2007
Institute of Astronomy
2007
Johannes Gutenberg University Mainz
1998
Ames Research Center
1990
view Abstract Citations (159) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spatial Variations of the 3 Micron Emission Features within UV--excited Nebulae: Photochemical Evolution Interstellar Polycyclic Aromatic Hydrocarbons Geballe, T. R. ; Tielens, A. G. M. Allamandola, L. J. Moorhouse, Brand, P. W. Spectra at microns have been obtained several positions in Orion Bar region and nebula surrounding HD 44179. Weak emission features 3.40,...
The first generation of stars (commonly known as population III) are expected to form in low-mass protogalaxies which molecular hydrogen is the dominant coolant. Radiation from these will rapidly build up an extragalactic ultraviolet (UV) background capable photodissociating H2, and it widely believed that this suppress further star formation systems. However, also produce X-ray background. This background, by increasing fractional ionization protogalactic gas, promotes H2 reduces...
Emission from the υ = 1–0 S(1) line of molecular hydrogen has been mapped over a section supernova remnant IC443. The emission originates in sinuous ridge where expanding shell SNR is interacting with cloud. relative intensities S(1), S(0) and 2–1 lines at 2.1–2.2μm were measured found to be characteristic shock-excitation gas. shows bright spots which are possibly density enhancements total luminosity region estimated about |$1000\enspace L_\odot$|, making IC443 one most luminous galactic...
The mammalian cell nucleus contains a variety of organelles or nuclear bodies which contribute to key functions. Promyelocytic leukemia (PML NBs) are involved in the regulation apoptosis, antiviral responses, DNA damage response and chromatin structure, but their precise biochemical function these pathways is unknown. One strategy tackle this problem assess biophysical properties component parts macromolecular assemblies living cells. In study we determined PML NB assembly dynamics by live...
view Abstract Citations (144) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ratios of molecular hydrogen line intensities in shocked gas : evidence for cooling zones. Brand, P. W. J. L. ; Moorhouse, A. Burton, M. G. Geballe, T. R. Bird, Wade, Column densities have been calculated from 19 infrared vibration-rotation and pure rotational measured at peak 1 the Orion outflow. The run column density with energy level is similar to a simple zone...
view Abstract Citations (138) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Fluorescent Molecular Hydrogen Emission from the Reflection Nebula NGC 2023 Gatley, Ian ; Hasegawa, Tetsuo Suzuki, Hiroko Garden, Ron Brand, Peter Lightfoot, John Glencross, William Okuda, Haruyuki Nagata, Tetsuya Observations of 2023, obtained at 1.4-2.5 microns using circular variable filter and a Fabry-Perot interferometer on 3.8-m UKIRT during August 1984...
The first star formation in the Universe is expected to take place within small protogalaxies, which gas cooled by molecular hydrogen. However, if massive stars form these they may suppress further photodissociating H2. We examine importance of this effect estimating time-scale on significant H2 destroyed. show that photodissociation least but becomes less so as protogalactic mass increases. also effects dense clumps protogalaxy. find while collapse will be inhibited low-density clumps,...
view Abstract Citations (88) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Level Population and Para/Ortho Ratio of Fluorescent H 2 in NGC 2023 Hasegawa, Tetsuo ; Gatley, Ian Garden, Ron P. Brand, Peter W. J. L. Ohishi, Masatoshi Hayashi, Masahiko Kaifu, Norio Observations vibrationally excited H2 10 lines at 2.03 - 2.39 μm toward the reflection nebula are presented compared with corresponding data Orion-KL. populations characterized by a...
Large scale many-core systems are able to execute concurrently changing mixes of different parallel applications. Hybrid application mapping combines the strengths design-time exploration/analysis resource constellations for task-to-core mappings with flexibility choosing concrete at run time. However, state-of-the-art design space exploration (DSE) techniques so far ignore problem symmetries in modern heterogeneous architectures: not only recurring patterns architecture but tasks instances...
Observations of the BL Lac object OJ 287 were made simultaneously at infrared JHK wavelengths and in optical near UBVRI 1983 January. These observations, total flux reaching a peak then decaying, complex polarization changes, are explained terms model jet emanating from an accretion disc.
Tailed, comet-like objects found in the outskirts of Gum nebula (and elsewhere) are shown to be |$\gt\,{10}^{5}$| yr old. This implies that H II region is much older than Vela Pulsar 0833 – 45. Tailed structure NGC 5367 suggests presence ionized hydrogen falling into galactic plane near l = 320°.
A type of shock which accelerates hyhdrogen molecules to a high velocity without dissociating is investigated. Such soft C-shocks are characterized by low Alfvén Mach numbers and streaming speeds the ions through neutrals. Therefore, in region speed, |$v_A$| can produce wide H2 line profiles. We show that shape width profiles OMC-1 outflow reproduced bow 200–250 km s–1 moving dense medium with |${v}_{A}\sim 46 \,\text{km}\,\text{s}^{-1}.$| Line ratio data also successfully modeled from an...
Summary We present emission-line profiles of molecular hydrogen from curved C-shocks within clouds. Shock configurations arising the supersonic motion jets and bullets a dense cloud are chosen. Bow shock speeds in range vw = 40-200 km s-1 investigated. Breakdown through dissociation selfionization restricts C-shock section to bow tail. find that ire essentially single-peaked narrow with full widths (at 10 per cent maximum intensity, deconvolved) up about 50,40 30 for cones, hemispherical...
The 1–0 O(7) and 0–0 S(13) lines of H2, at 3.807 3.846 μm, have been mapped over the region Orion molecular outflow. intensity ratio these is found to be independent position in From this it inferred that structure shocks their cooling flows may more akin hydrodynamic than low-temperature C-shocks are currently favored.
view Abstract Citations (72) References (63) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Multifrequency Observations of BL Lacertae Bregman, Joel N. ; Glassgold, A. E. Huggins, P. J. Neugebauer, G. Soifer, B. T. Matthews, K. Elias, H. Webb, R. Pollock, Leacock, Smith, Aller, D. M. F. Hughes, Maccagni, Garilli, Giommi, Miller, S. Stephens, Balonek, Dent, W. Kinsel, Wisniewski, Z. Williams, Brand, L. Ku, -M. We present 20 years optical, infrared, and radio...
Infrared polarimetry and photometry have been obtained for a sample of 18 BL Lac objects. The data covers period one year is part continuing monitoring programme; all observations were in the J, H K wavebands. Large variable degrees polarization are common property sample. Two objects show wavelength-dependent polarization, with increasing towards shorter wavelengths, two evidence position angle rotations over five- day period. relationship between changes polarized total flux also...
Simultaneous infrared and optical polarimetry photometry have been obtained for AO 0235 + 164 covering a five night period. The object underwent polarization burst during which the 2.2 μm rose from 17.5 to 28.7 per cent fell again 14.9 cent. At its peak degree of was 43.9 cent, highest linear observed in BL Lac object. data show increase towards shorter wavelengths, effect is inconsistent with either dilution by galactic component or simple one-component synchrotron models. large changes are...
Over 30 lines from the v = 3–0, 4–1, 7–3, and 8–4 vibrational series of hydrogen molecule have been observed λ 7600–8800 Å in reflection nebula NGC 2023, originating levels up to 41,000 K above ground. This is first time that H2 has optical CCD regime, these are highest excitation ground electronic state yet detected. The spectrum shows characteristics expected UV fluorescence, although detail there some differences model predictions. Emission newly formed molecules 4 may Strong [C I] 8727-Å...
Five emission lines of molecular hydrogen, with wavelengths in the ranges 2.10–2.25 and 3.80–3.85 μm, have been observed four objects different type which line is believed to be excited by shocks. The relative intensities |$1-0S(1):1-0S(0):2-1S(1)$| are approximately 10.5:2.5:1.0 all objects. |$0-0S(13):1-0\enspace O(7)$| ratio, however, varies from 1.05 OMC-1 about 2.3 Herbig–Haro object HH 7. excitation temperature derived S(13) O(7) higher than that 1–0 2–1 S(1) objects, so shocked gas...
The profile of the |$1-0\enspace \text S(1)$| line molecular hydrogen at Peak 1 is presented, and shown to pose problems for many models excitation region.
We demonstrate that molecular-hydrogen emission-line ratios can be utilized to distinguish between models for shocks in molecular clouds. compare planar and curved of both C- J-type. Specifically, we determine here line strengths from a model bow-shaped C-shocks under high-density cloud conditions. The are independent the bow speed once it exceeds breakdown value (typically 30–50 km s–1). This is because H2 emitting section simply shifted towards tail at higher speeds. sensitive only shape...