Preliminary test results from the evaluation of Si:Sb and Si:Ga 58 x 62-element infrared detector... more Preliminary test results from the evaluation of Si:Sb and Si:Ga 58 x 62-element infrared detector arrays are presented. These devices are being characterized under background conditions and readout rates representative of operation in orbiting, crogenically-cooled infrared observatories. The arrays are hybridized to silicon direct-readout multiplexers which allow random-access and nondestructive readout. Array performance optimization is being conducted with a flexible
Preliminary test results from the evaluation of Si:Sb and Si:Ga 58 x 62-element infrared detector... more Preliminary test results from the evaluation of Si:Sb and Si:Ga 58 x 62-element infrared detector arrays are presented. These devices are being characterized under background conditions and readout rates representative of operation in orbiting, crogenically-cooled infrared observatories. The arrays are hybridized to silicon direct-readout multiplexers which allow random-access and nondestructive readout. Array performance optimization is being conducted with a flexible
Ground-based and Airborne Instrumentation for Astronomy VII, 2018
The Wide Field Optical Spectrometer (WFOS) is a seeing limited, multi-object spectrograph and fir... more The Wide Field Optical Spectrometer (WFOS) is a seeing limited, multi-object spectrograph and first light instrument for the Thirty Meter Telescope (TMT) scheduled for first observations in 2027. The spectrograph will deliver a minimum resolution of R~5,000 over a simultaneous wavelength range of 310 nm to 1,000 nm with a multiplexing goal of between 20 and 700 targets. The WFOS team consisting of partners in China, India, Japan, and the United States has completed a trade study of two competing concepts intended to meet the design requirements derived from the WFOS detailed science case. The first of these design concepts is a traditional slit mask instrument capable of delivering R~1,000 for up to 100 simultaneous targets using 1 x 7 arc second slits, and a novel focal plane slicing method for R~5,000 on up to 20 simultaneous targets can be achieved by reformatting the 1 arc-second wide slits into three 0.3 arc-second slits projected next to each other in the spatial direction. Th...
The center of the Galaxy provides a unique opportunity to study many of the fascinating phenomena... more The center of the Galaxy provides a unique opportunity to study many of the fascinating phenomena assocated with galactic nuclei at relatively high spatial resolution. Of particular interest is the circumnuclear disk (CND) that circulates about Sgr A* with a sharp inner edge at 1.5 pc. Discovered in its far-IR continuum emission, the ring has since been investigated in a wide variety long wavelength spectral line and continuum probes. This work has shown that the ring is warm, dense, and turbulent. The total mass of the ring out to 4 pc radius is about 104 M⊙. Within the ring lies the ”mini-spiral”, a group of gas and dust streamers. The ring/mini-spiral morphology is well illustrated by the high resolution KAO images at 31 and 38 µm that clearly illustrate all of these features [1]. The warm dust traced by these images is heated by the far-UV radiation from the central star cluster.
Ground-based and Airborne Instrumentation for Astronomy IV, 2012
ABSTRACT FIFI-LS (Field-Imaging Far-Infrared Line Spectrometer) is an imaging spectrograph for SO... more ABSTRACT FIFI-LS (Field-Imaging Far-Infrared Line Spectrometer) is an imaging spectrograph for SOFIA comprised of two medium resolution (R~2200) grating spectrometers feeding two 16x25 pixel detector arrays, which enable simultaneous line observations across two wavelength ranges (42-110 &#956m and 110-210&#956m) each across a field of view of 5x5 pixel. FIFI-LS will be the extragalactic spectroscopic workhorse for SOFIA. FIFI-LS has enough sensitivity to observe a substantial sample of nearby galaxies. It also has the right combination of wavelength range and spatial resolution to carry out unique new observations beyond those possible with Herschel, Spitzer, ISO and IRAS. As the effective sensitivity of FIFI-LS is only about a factor of 3-5 lower than the PACS spectrometer onboard Herschel, mainly due to an enhanced multiplexing advantage, FIFI-LS will build upon recent exciting scientific results and spearhead the post- Herschel far-infrared era. FIFI-LS is scheduled for commissioning onboard SOFIA in early 2014. An account on the instrument and its current stratus will be presented.
Preliminary test results from the evaluation of Si:Sb and Si:Ga 58 x 62-element infrared detector... more Preliminary test results from the evaluation of Si:Sb and Si:Ga 58 x 62-element infrared detector arrays are presented. These devices are being characterized under background conditions and readout rates representative of operation in orbiting, crogenically-cooled infrared observatories. The arrays are hybridized to silicon direct-readout multiplexers which allow random-access and nondestructive readout. Array performance optimization is being conducted with a flexible
Preliminary test results from the evaluation of Si:Sb and Si:Ga 58 x 62-element infrared detector... more Preliminary test results from the evaluation of Si:Sb and Si:Ga 58 x 62-element infrared detector arrays are presented. These devices are being characterized under background conditions and readout rates representative of operation in orbiting, crogenically-cooled infrared observatories. The arrays are hybridized to silicon direct-readout multiplexers which allow random-access and nondestructive readout. Array performance optimization is being conducted with a flexible
Ground-based and Airborne Instrumentation for Astronomy VII, 2018
The Wide Field Optical Spectrometer (WFOS) is a seeing limited, multi-object spectrograph and fir... more The Wide Field Optical Spectrometer (WFOS) is a seeing limited, multi-object spectrograph and first light instrument for the Thirty Meter Telescope (TMT) scheduled for first observations in 2027. The spectrograph will deliver a minimum resolution of R~5,000 over a simultaneous wavelength range of 310 nm to 1,000 nm with a multiplexing goal of between 20 and 700 targets. The WFOS team consisting of partners in China, India, Japan, and the United States has completed a trade study of two competing concepts intended to meet the design requirements derived from the WFOS detailed science case. The first of these design concepts is a traditional slit mask instrument capable of delivering R~1,000 for up to 100 simultaneous targets using 1 x 7 arc second slits, and a novel focal plane slicing method for R~5,000 on up to 20 simultaneous targets can be achieved by reformatting the 1 arc-second wide slits into three 0.3 arc-second slits projected next to each other in the spatial direction. Th...
The center of the Galaxy provides a unique opportunity to study many of the fascinating phenomena... more The center of the Galaxy provides a unique opportunity to study many of the fascinating phenomena assocated with galactic nuclei at relatively high spatial resolution. Of particular interest is the circumnuclear disk (CND) that circulates about Sgr A* with a sharp inner edge at 1.5 pc. Discovered in its far-IR continuum emission, the ring has since been investigated in a wide variety long wavelength spectral line and continuum probes. This work has shown that the ring is warm, dense, and turbulent. The total mass of the ring out to 4 pc radius is about 104 M⊙. Within the ring lies the ”mini-spiral”, a group of gas and dust streamers. The ring/mini-spiral morphology is well illustrated by the high resolution KAO images at 31 and 38 µm that clearly illustrate all of these features [1]. The warm dust traced by these images is heated by the far-UV radiation from the central star cluster.
Ground-based and Airborne Instrumentation for Astronomy IV, 2012
ABSTRACT FIFI-LS (Field-Imaging Far-Infrared Line Spectrometer) is an imaging spectrograph for SO... more ABSTRACT FIFI-LS (Field-Imaging Far-Infrared Line Spectrometer) is an imaging spectrograph for SOFIA comprised of two medium resolution (R~2200) grating spectrometers feeding two 16x25 pixel detector arrays, which enable simultaneous line observations across two wavelength ranges (42-110 &#956m and 110-210&#956m) each across a field of view of 5x5 pixel. FIFI-LS will be the extragalactic spectroscopic workhorse for SOFIA. FIFI-LS has enough sensitivity to observe a substantial sample of nearby galaxies. It also has the right combination of wavelength range and spatial resolution to carry out unique new observations beyond those possible with Herschel, Spitzer, ISO and IRAS. As the effective sensitivity of FIFI-LS is only about a factor of 3-5 lower than the PACS spectrometer onboard Herschel, mainly due to an enhanced multiplexing advantage, FIFI-LS will build upon recent exciting scientific results and spearhead the post- Herschel far-infrared era. FIFI-LS is scheduled for commissioning onboard SOFIA in early 2014. An account on the instrument and its current stratus will be presented.
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