A5083546811- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Space Satellite Systems and Control
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Molecular Spectroscopy and Structure
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Optical Systems and Laser Technology
- Atmospheric Ozone and Climate
- GNSS positioning and interference
- Laser-induced spectroscopy and plasma
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- High-pressure geophysics and materials
- Inertial Sensor and Navigation
- Remote Sensing in Agriculture
- Nuclear Physics and Applications
- Atmospheric and Environmental Gas Dynamics
Mount Stromlo Observatory
2012-2021
Rambus (United States)
2018
ACT Government
1995-2014
Electro Optical Systems (Germany)
2014
IP Australia
2011
Cerro Tololo Inter-American Observatory
2008
Eos Neuroscience (United States)
2000-2006
Australian Defence Force Academy
1993-2004
Kodak (United States)
1993-2002
Eastman Chemical Company (United States)
2002
The spectral energy distributions are presented for 60 galaxies which 8–13 μm, and in some cases 17–23 spectra have been obtained. These infrared (IR) bright discussed terms of their properties the mid-IR relationship with far-IR properties. Almost all can be placed one three classes on basis μm spectra: those dominated by family narrow bands between 3–13 featureless continua that display silicate absorption band. H II region galaxy nuclei, i.e. contain powerful nuclear regions whose...
The spectral energy distributions and mid-infrared spectra of 44 carbon Mira variables are fitted using a dust radiative transfer model. pulsation periods these stars cover the entire range observed for Miras. luminosities derived from period—luminosity relation. Parameters distance, temperature at inner radius, mass-loss rate ratio silicon carbide to amorphous dust. total is modified relation between photon momentum (L/c) wind (̇Mv∞). Mass-loss rates 1 × 10−8 4 10−5 M⊙ yr−1 found. We find...
ALTHOUGH toxoplasmosis was suggested as a cause of congenital choroido- retinitis over 30 years ago, the definite importance organism in acquired disease is still doubt.The early observations Janku (1923) and Torres (1927) attracted little attention until Wolf Cowen (1937) isolated parasite from fatal human case.The frequent occurrence neonatal cases has been confirmed by many authors-for example, Pinkerton Weinman (1940) Koch, Wolf, Cowen, Paige (1943)-and with development serological...
We present 8–13 μm spectropolarimetry of 55 sources and 16–22 six these. This represents a substantial fraction star formation regions that can be observed in this way with current technology on 4-m class telescopes (i.e. brighter than about 20 Jy at 10 4-arcsec beam). Most the are embedded young stellar objects (YSOs), H ii containing sites or bipolar protoplanetary nebulae (PPN), although few other (e.g. NGC 1068, MWC 349) also included. The majority have oxygen-rich chemistry but there...
We present spectropolarimetric observations of AFGL 2591 in the 10 and 20 μm regions. These confirm that polarization at these wavelengths is due to dichroic absorption by aligned grains infer this also mechanism near infrared. The aligning field normal bipolar axis molecular flow larger scale local interstellar medium. As well as feature usually seen attributed amorphous silicates (e.g. BN object Orion) an additional narrow observed 11.2 μm. It considered a more structured silicate, similar...
The technical embodiment of the Huygens-Fresnel principle, an optical phased array (OPA) is arrangement emitters with relative phases controlled to create a desired beam profile after propagation. One important application OPA coherent combining (CBC), which can be used beams higher power than possible single laser source, especially for narrow linewidth sources. Here we present all-fiber architecture that stabilizes output phase by inferring path length differences between lasers using...
DESPITE modern methods of investigation those cases endogenous uveitis in which the aetiology is known with certainty are few, so that this group diseases remains to-day one major problems ophthalmology.For example, statistical studies show that, all causes blindness, responsible for 7 95 per cent. England and Wales (Sorsby, 1950), 8 Norway (Holst, 1952), 11 -9 cent.(Cowan English, 1941) 5 cent.(Hurlin others, 1947) United States.The clinical classification into anterior or posterior, acute...
We describe the Dark Energy Camera (DECam), which will be primary instrument used in Survey. DECam a 3 sq. deg. mosaic camera mounted at prime focus of Blanco 4m telescope Cerro-Tololo International Observatory (CTIO). includes large CCD focal plane, five element optical corrector, filters (g,r,i,z,Y), and associated infrastructure for operation cage. The plane consists 62 2K x 4K modules (0.27"/pixel) arranged hexagon inscribed within roughly 2.2 degree diameter field view. CCDs 250 micron...
view Abstract Citations (60) References (61) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Interstellar Dust Absorption Features in the Infrared Spectrum of HH 100-IR: Searching for Nitrogen Component Ices Whittet, D. C. B. ; Smith, R. G. Adamson, A. J. Aitken, K. Chiar, E. Kerr, T. H. Roche, P. F. Wright, M. We present observations solid-state absorption features due to water ice, CO and silicate dust spectrum bright infrared source (IRS 1) associated with...
We present observations of the nucleus NGC 4418 which show it to be perhaps first true infrared galaxy. was found very bright in by IRAS, and ground-based have been employed investigate nature emission. Optical spectra little evidence luminous core galaxy, revealing only stellar absorption features weak emission lines. The a deep minimum at 9.7 μm, implying visual extinction ⪢50 mag indicating that source producing luminosity is completely obscured visible. From relatively warm IRAS colours,...
Spectrophotometric observations at 11–13 µm along a north–south line across the ionization front to south-east of Trapezium in Orion are presented. Spectral structure, form step on short wavelength edge well known emission band 11.3 µm, is revealed together with resolved feature 12.7 and an underlying continuum. These three components peak just outside ionized region decrease intensity distance away from front. The continuum or plateau falls off more slowly than bands µm. lend some support...
Space debris in low Earth orbit below 1500km is becoming an increasing threat to satellites and spacecrafts.Radar laser tracking are currently used monitor the orbits of thousands space active able use this information manoeuvre out way a predicted collision.However, many not debris-on collisions significant contributor growing population.The removal from preferred more definitive solution.Space may be achieved through ablation, whereby high power corrected with adaptive optics system could,...
The |$8.1 \mu \text m\enspace \Delta\upsilon = 1$| emission band of silicon monoxide detected in SN 1987A is modelled. Near day 500 the SiO mass |$4\pm 2\times 10^{-6} M_\odot$| and excitation temperature ∼ 1500 K. about 10 per cent dust inferred from mid-infrared near 600, while close to condensation silicate grains. molecules may have been precursors grain formation.
Spectropolarimetric observations of the BN object at 10 and 20 μm reveal a surprisingly large ratio to polarization in respective peaks. The results are compared with predictions core/mantle grain models based on graphite ice mixtures variety silicates. Except for glassy bronzite, which wavelength match peak region is very poor, all these predict substantially smaller amounts than observed. It seems that either astronomically important silicates have particularly strong Si–O bending mode, or...
Thermal emission from magnetically aligned dust grains produces the observed mid-infrared polarization in northern arm and east—west bar of SgrA West; recent arcsecond-resolution imaging polarimetry at 12.5 μm these ionized filaments is presented, which confirms extends previous studies. A lower limit ∼2 mG found for magnetic field IRS16 complex appears to be displaced by ∼ 0.15 pc along line sight.
view Abstract Citations (55) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Polarimetric Imaging of the Galactic Center at 12.4 Microns: The Detailed Magnetic Field Structure in Northern Arm and East-West Bar Aitken, David K. ; Gezari, Daniel Smith, Craig H. McCaughrean, Mark Roche, Patrick F. Recent closely sampled imaging polarimetry central 0.5 pc Galaxy microns with a 58 x 62 array camera system is presented. results clearly show that...
High quality spectra at 8–13 μm of five compact objects that display narrow infrared emission bands are presented. All the well-known 11.25- and 8.56-μm features together with long wavelength wing 7.7-μm band. In addition, weaker near 11.05 11.5 and/or ‘plateau’ between 12.7-μm evident in some objects. There is considerable dispersion as to equivalent width from object object. The pre-main sequence star TY CrA has a remarkable spectrum, displaying an especially pronounced feature intensity...