A5010330459- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Ionosphere and magnetosphere dynamics
- Photonic and Optical Devices
- Advanced Semiconductor Detectors and Materials
- Semiconductor Quantum Structures and Devices
- Geophysics and Gravity Measurements
- GNSS positioning and interference
- History and Developments in Astronomy
- Satellite Image Processing and Photogrammetry
- Advanced Measurement and Metrology Techniques
- Space Satellite Systems and Control
- Bayesian Methods and Mixture Models
University of Florida
2005-2018
University of Wisconsin–Madison
2009
Universidad Nacional Autónoma de México
2007
U.S. National Science Foundation
2003
Kitt Peak National Observatory
2003
Association of Universities For Research In Astronomy
2003
University of Rochester
1993-2000
We present an analysis of K-band stellar distributions for the young clusters GGD 12-15, IRAS 20050+2720, and NGC 7129. find that two deeply embedded clusters, 12-15 are not azimuthally symmetric show a high degree structure which traces filamentary observed in 850 micron emission maps. In contrast, 7129 cluster is circularly symmetric, less dense, anti-correlated to emission, suggesting recent gas expulsion dynamical expansion have occured. estimate volume densities from nearest neighbor...
We present wide-field near-infrared (JHK) images of the young, τ = 2 Myr IC 348 cluster taken with FLAMINGOS. use these new data to construct an infrared census sources, which is sensitive enough detect a 10 Jup brown dwarf seen through extinction AV ∼ 7. examine cluster's structure and relationship molecular cloud K-band luminosity function. Using our model function algorithm, we derive initial mass (IMF) throughout stellar substellar regimes find that IMF very similar found for Trapezium...
Using the Florida Multi-object Imaging Near-IR grism Observational Spectrometer (FLAMINGOS), we have conducted FLAMINGOS Extragalactic Survey (FLAMEX), a deep imaging survey covering 7.1 square degrees within 18.6 sq. deg NOAO Deep Wide-Field (NDWFS) regions. FLAMEX is first deep, wide-area near-infrared to image in both J and Ks filters, larger than any previous NIR surveys of comparable depth. The intent facilitate study galaxy cluster evolution at 11 clusters detected using joint FLAMEX,...
Observations of binary stars containing an accreting black hole or neutron star often show x-ray emission extending to high energies (>10 kilo--electron volts), which is ascribed accretion disk corona energetic particles akin those seen in the solar corona. Despite their ubiquity, physical conditions coronae remain poorly constrained. Using simultaneous infrared, optical, x-ray, and radio observations Galactic system V404 Cygni, showing a rapid synchrotron cooling event its 2015 outburst, we...
We have fabricated and characterized six-element monolithic arrays of Ge:Ga blocked- impurity-band detectors, with threshold wavelength 220 μm, peak quantum efficiency 14%, detective 9%, dark current 300 e− s−1, response uniformity better than 4%. The devices are described very well by the standard model blocked-impurity-band appear to satisfy many requirements low-background astronomical instruments.
We have compared directly the performance of a Pb1−xSnxTe(In) photodetector with that two other state-of-the-art far-infrared detectors: Si(Sb) blocked impurity band (BIB) detector and Ge(Ga) photoconductor in an integrating cavity. The has current responsivity SI several orders magnitude higher than BIB at wavelength λ=14.5 μm. Persistent photoresponse SI∼103 A/W 40 mV bias 1 s integration time wavelengths λ=90 116 μm also been observed photodetector. This is larger by factor ∼100 same conditions.
view Abstract Citations (61) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS High Spatial Resolution Fabry-Perot Imaging of M82: Near-Infrared Recombination Line Observations Satyapal, Shobita ; Watson, Dan M. Pipher, Judith L. Forrest, William J. Coppenbarger, Diana Raines, S. Nicholas Libonate, Scott Piche, Francois Greenhouse, Matthew A. Smith, Howard Thompson, Keith Fischer, Jacqueline Woodward, Charles E. Hodge, Tracy We present high...
We report on the design and status of FLAMINGOS-2 instrument - a fully-cryogenic facility near-infrared imager multi-object spectrograph for Gemini 8-meter telescopes. has refractive all-spherical optical system providing 0.18-arcsecond pixels 6.2-arcminute circular field-of-view 2048x2048-pixel HAWAII-2 0.9-2.4 mm detector array. A slit/decker wheel mechanism allows selection up to 9 laser-machined plates or 3 long slits spectroscopy over 6x2-arcminute field view, selectable grisms provide...
We report on the design and status of FLAMINGOS-2 instrument - a fully-cryogenic facility near-infrared imager multi-object spectrograph for Gemini 8-meter telescopes. has refractive all-spherical optical system providing 0.18-arcsecond pixels 6.2-arcminute circular field-of-view 2048x2048-pixel HAWAII-2 0.9-2.4 mm detector array. A slit/Dekker wheel mechanism allows selection up to 9 laser-machined plates or 3 long slits spectroscopy over 6x2-arcminute field view, selectable grisms provide...
We report on the performance of FLAMINGOS, world's first fully cryogenic near-IR multi-object spectrometer. FLAMINGOS has a fast all refractive optical system, which can be used at telescopes slower than f/7.5. This makes very efficient wide-field imager when small aperture and high AW spectrometer using laser machined masks for MOS spectroscopy. uses 2048x2048 HgCdTe HAWAII-2 array by Rockwell Science Center. The is readout through 32 amplifiers, results in low overheads observations....
We report on the design, on-sky performance, and status of FLAMINGOS-2 instrument – fully-cryogenic facility near-infrared imager multi-object spectrograph for Gemini 8-meter telescopes. has a refractive all-spherical optical system providing 0.18-arcsecond pixels 6.2-arcminute circular field-of-view 2048x2048- pixel HAWAII-2 0.9-2.4 μm detector array. A slit/decker wheel mechanism allows selection up to 9 laser-machined plates or 3 long slits spectroscopy over 6x2-arcminute field view,...
We report high spatial and spectral resolution [Fe II] 1.644 μm Fabry-Perot imaging observations of M82. present extinction-corrected images discuss the nature compact emission regions revealed by these new data. conclude that sources trace a population supernova remnants in M82 are substantially older than those previously on 6 cm radiographs. In addition, we find contains distributed component is extended along southern minor axis accounts for 90% galaxy's luminosity. interpret this as...
Fructans are the main soluble carbohydrate in onion ( Allium cepa ) bulbs and their concentrations show significant correlations with dry weights pungency. In previous research, we identified regions on chromosomes 5 8 associated higher amounts of carbohydrates bulbs. this estimated genetic effects interactions between these two chromosome using larger inbred families grown field trials over 3 years. Bulbs were evaluated 30 90 days after harvest (DAH) for carbohydrates. Fructan decreased...
New infrared images of Cep A East are presented that show two regions shock-excited line emission from separate bipolar flows. We identify the dominant sources powering outflows and argue results support a multiple outflow model (Narayanan & Walker) as opposed to quadrupolar scenario. The include near-infrared broadband ( [2.158 μm], L'' [3.81 M' [4.67 μm]) spectral ([Fe II] at 1.644 μm H2 1-0 S[1] 2.122 μm) observations, well continuum emission, μm. Considering our data other results, we...
We report on the design and status of FLAMINGOS-2 instrument - a fully-cryogenic facility near-infrared imager multi-object spectrograph for Gemini 8-meter telescopes. has refractive all-spherical optical system providing 0.18-arcsecond pixels 6.2-arcminute circular field-of-view 2048×2048-pixel HAWAII-2 0.9-2.4 μm detector array. A slit/decker wheel mechanism allows selection up to 9 laser-machined plates or 3 long slits spectroscopy over 6×2-arcminute field view, selectable grisms provide...
We report an infrared 1-1.8 μm (J+H-band), low-resolution (R = 450) spectrogram of the highest redshift radio-loud quasar currently known, SDSS J083643.85+005453.3, obtained during spectroscopic commissioning run FLAMINGOS multiobject, near-IR spectrograph at 8 m Gemini-South Observatory. These data show broad emission from both C IV λ1549 and III] λ1909, with strengths comparable to lower composite spectra. The implication is that there substantial enrichment environment, even times less...
We present the results of wide integral-field near-infrared (1.0–1.8 μm) spectroscopic observations southeastern shell young core-collapse supernova remnant (SNR) G11.2−0.3. first construct [Fe ii] 1.644 μm line images three bright clumps from obtained spectral image cubes and compare them with those other transitions such as 1.257, 1.534, He i 1.083 images. This allows us to estimate electron density (∼4700–9400 cm−3) extinction (AV ∼ 16–20 mag) shell, including a detailed two-dimensional...
We report on the design and status of Florida Image Slicer for Infrared Cosmology Astrophysics (FISICA) - a fully-cryogenic all-reflective image-slicing integral field unit FLAMINGOS near-infrared spectrograph. Designed to accept input beams near f/15, FISICA with provides R~1300 spectra over 16x33-arcsec field-of-view Cassegrain f/15 focus KPNO 4-meter telescope, or 6x12-arcsec Nasmyth Bent foci Gran Telescopio Canarias 10.4-meter telescope. accomplishes this using three sets "monolithic"...
The Mid-resolution InfRAreD Astronomical Spectrograph (MIRADAS, a near-infrared multi-object echelle spectrograph operating at spectral resolution R=20,000 over the 1-2.5μm bandpass) was selected in 2010 by Gran Telescopio Canarias (GTC) partnership as next-generation for world's largest optical/infrared telescope, and is being developed an international consortium. MIRADAS consortium includes University of Florida, Universidad de Barcelona, Complutense Madrid, Instituto Astrofísica...
The Mid-resolution InfRAreD Astronomical Spectrograph (MIRADAS, a near-infrared multi-object echelle spectrograph operating at spectral resolution R=20,000 over the 1-2.5μm bandpass) was selected by Gran Telescopio Canarias (GTC) partnership as next-generation for world's largest optical/infrared telescope, and is being developed an international consortium. MIRADAS consortium includes University of Florida, Universidad de Barcelona, Complutense Madrid, Instituto Astrofísica Canarias,...
The Canarias InfraRed Camera Experiment (CIRCE) is a near-infrared (1–2.5[Formula: see text][Formula: text]m) imager, polarimeter and low-resolution spectrograph operating as visitor instrument for the Gran Telescopio (GTC) 10.4-m telescope. It was designed built largely by graduate students postdocs, with help from University of Florida (UF) astronomy engineering group, funded UF US National Science Foundation. CIRCE intended to fill gap in capabilities prior arrival Especrografo...
We present the first Spitzer-IRS spectral maps of Herbig-Haro flow GGD 37 detected in lines [Ne III], [O IV], [Ar and V]. The detection extended IV] (55 eV) some emission V] (97 indicates a shock temperature excess 100,000 K, agreement with X-ray observations, speed 200 km s-1. presence an pho- toionization or collisional ionization region that is highly unusual protostellar outflow.
CIRCE is a near-infrared (1-2.5 micron) imager, polarimeter and low-resolution spectrograph intended as visitor instrument for the Gran Telescopio Canarias 10.-4m telescope. It was built largely by graduate students postdocs, with help from UF astronomy engineering group, funded University of Florida U.S. National Science Foundation. to fill gap in time between GTC first light arrival EMIR, will also provide following scientific capabilities compliment EMIR after its arrival: high-...
The Mid-resolution InfRAreD Astronomical Spectrograph (MIRADAS) is a near-infrared (NIR) multi-object spectrograph for the Gran Telescopio Canarias (GTC). It can simultaneously observe multiple targets selected by 20 identical deployable probe arms with pickoff mirror optics. bases of are fixed to multiplexing system (MXS) plate, circular platform, and arranged in layout minimum separation between elements arms. This document presents MXS prototype P2a, full-scale, fully operational MIRADAS...
We describe the design, development, and laboratory test results of cryogenic probe arms feeding deployable integral field units (IFUs) for Mid-resolution InfRAreD Astronomical Spectrograph (MIRADAS) - a near-infrared multi-object echelle spectrograph 10.4-meter Gran Telescopio Canarias. MIRADAS selects targets using 20 positionable pickoff mirror optics on arms, each 3.7x1.2-arcsec view to units, while maintaining excellent diffraction-limited image quality. The are based concept developed...