A5029432454- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Photocathodes and Microchannel Plates
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Calibration and Measurement Techniques
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- CCD and CMOS Imaging Sensors
- Atmospheric and Environmental Gas Dynamics
- Planetary Science and Exploration
- Adaptive optics and wavefront sensing
- History and Developments in Astronomy
- Atomic and Molecular Physics
- Spacecraft and Cryogenic Technologies
- Molecular Spectroscopy and Structure
- Infrared Target Detection Methodologies
- Geomagnetism and Paleomagnetism Studies
- Geophysics and Gravity Measurements
Space Telescope Science Institute
2014-2024
Tektronix (United States)
2023
Johns Hopkins University
2002-2013
University of California, Berkeley
1996-2009
University of Baltimore
2009
Ames Research Center
2009
Cisco Systems (United States)
2001
The University of Queensland
1992-1996
Association of Universities For Research In Astronomy
1995
Cerro Tololo Inter-American Observatory
1995
The Hubble Deep Field (HDF) is a Director's Discretionary program on HST in Cycle 5 to image an undistinguished field at high Galactic latitude four passbands as deeply reasonably possible. These images provide the most detailed view date of distant galaxies and are likely be important for wide range studies galaxy evolution cosmology. In order optimize observing time available, northern continuous viewing zone was selected were taken ten consecutive days, or approximately 150 orbits....
Abstract We present the wide field slitless spectroscopy mode of NIRISS instrument on James Webb Space Telescope. This employs two orthogonal low-resolution (resolving power ≈150) grisms in combination with a set six blocking filters wavelength range 0.8–2.3 μ m to provide spectrum almost every source across field-of-view. When combined low background, high sensitivity and spatial resolution afforded by telescope, this will enable unprecedented studies structure evolution distant galaxies....
We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the O VI λλ1031.926, 1037.617 absorption lines associated with gas in and near Milky Way, as detected spectra a sample 100 extragalactic targets two distant halo stars. combine data from several FUSE Science Team programs guest observer that were public before 2002 May 1. The sight cover most sky above Galactic latitude |b| > 25°—at lower ultraviolet extinction is usually too large for observations. describe details...
We obtained high-resolution Far Ultraviolet Spectroscopic Explorer (FUSE; R ~ 20,000) and Very Large Telescope (VLT; 45,000) spectra of the quasar HE 2347-4342 in order to study properties intergalactic medium between redshifts z = 2.0 2.9. The high-quality optical spectrum allows us identify approximately 850 H I absorption lines with column densities N 5 × 1011 1018 cm-2. reprocessed FUSE extends wavelength coverage He II down an observed 920 Å. Source flux is detected rest-frame...
We have reevaluated the constraints on Lyman continuum emission from four starburst galaxies observed with Hopkins Ultraviolet Telescope (HUT) during Astro-2 mission. Applying a detailed model of absorption by interstellar gases in our Galaxy, and using latest HUT data products, we find upper limits to redshifted that are less restrictive than those reported previously (Leitherer et al. 1995 ApJ, 454, L19). Well determined astrophysical instrumental effects permit 2-sigma no tighter 5.2%,...
We have reanalyzed FUSE data and obtained new Chandra observations of Haro 11, a local (DL = 88 Mpc) UV luminous galaxy. 11 has far-UV luminosity (1010.3 L☉), surface brightness (109.4 L☉ kpc-2), star formation rate (SFR), metallicity similar to those observed in Lyman-break galaxies (LBGs). show that extended soft thermal (kT ~ 0.68 keV) X-ray emission size which scales with the physical properties (e.g., SFR, stellar mass) host An enhanced α/Fe ratio ~4 relative solar abundance suggests...
Since its launch in 1999, the Far Ultraviolet Spectroscopic Explorer (FUSE) has made over 4900 observations of some 2500 individual targets. The data are reduced by principal investigator team at Johns Hopkins University and archived Multimission Archive STScI (MAST). reduction software package, called CalFUSE, evolved considerably lifetime mission. entire FUSE set recently been reprocessed with CalFUSE version 3.2, latest this software. This paper describes instrument calibrations on which...
We have analyzed archival far-ultraviolet spectra of the UV-bright star III-60 in globular cluster NGC 6723 obtained with Far Ultraviolet Spectroscopic Explorer (FUSE) and Cosmic Origins Spectrograph (COS). find that star's photospheric parameters (effective temperature $T_{\rm eff} = 44{,}800 \pm 1200$, surface gravity $\log g 4.89 0.18$, helium abundance N({\rm He})/N({\rm H}) -0.84 0.29$) are consistent values derived from its optical spectrum, suggesting optically-derived generally...
Abstract We have analyzed archival far-ultraviolet spectra of the UV-bright star III-60 in globular cluster NGC 6723 obtained with Far Ultraviolet Spectroscopic Explorer and Cosmic Origins Spectrograph. find that star's photospheric parameters (effective temperature T eff = 44,800 ± 1200 K, surface gravity <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>log</mml:mi> <mml:mi>g</mml:mi> <mml:mo>=</mml:mo> <mml:mn>4.89</mml:mn> <mml:mo>±</mml:mo>...
As part of a study the dynamical properties rich clusters with central, dominant D or cD galaxies, we present optical redshifts for sample 638 galaxies in fields Abell 85, DC 0107-46, 496, 2052, and 1842-63. The velocity histograms wedge diagrams show evidence foreground sheet 85 background sheets 0107-46 2052. We have used both Dressler Shectman West Bothun statistical tests substructure. confirm group projected against center found by Beers et al. (1991). also find significant substructure...
view Abstract Citations (100) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Constraints on the Origin of Ultraviolet Upturn in Elliptical Galaxies from Hopkins Telescope Observations NGC 1399 Ferguson, Henry C. ; Davidsen, Arthur F. Kriss, Gerard A. Blair, William P. Bowers, Charles W. Dixon, Van Dyke Durrance, Samuel T. Feldman, Paul D. Henry, Richard Kruk, Jeffrey Moos, H. Warren Vancura, Olaf Long, Knox S. Kimble, Randy The giant...
view Abstract Citations (98) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Hopkins Ultraviolet Telescope Observations of the Far-Ultraviolet Spectrum NGC 4151 Kriss, G. A. ; Davidsen, F. Blair, William P. Bowers, C. W. Dixon, V. Durrance, S. T. Feldman, D. Ferguson, H. Henry, R. Kimble, Kruk, J. Long, Knox Moos, Vancura, O. We observed far-ultraviolet spectrum Seyfert galaxy from 912 to 1860 A with during flight Astro-1 aboard space shuttle...
view Abstract Citations (56) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Determination of Ionic Abundances in the Io Torus Using Hopkins Ultraviolet Telescope Moos, H. W. ; Feldman, P. D. Durrance, S. T. Blair, Bowers, C. Davidsen, A. F. Dixon, V. Ferguson, Henry, R. Kimble, Kriss, G. Kruk, J. Long, K. Vancura, O. Attention is given to a 415-1864-A spectrum emissions from torus with about 3-A resolution first order (830-1864 A) obtained...
We present a survey of diffuse O VI emission in the interstellar medium obtained with Far Ultraviolet Spectroscopic Explorer (FUSE). Spanning 5.5 years FUSE observations, from launch through 2004 December, our data set consists 2925 exposures along 183 sight lines, including all those previously-published detections. The were processed using an implementation CalFUSE v3.1 modified to optimize signal-to-noise ratio and velocity scale spectra aperture-filling source. Of 73 show 1032 emission,...
We present Far Ultraviolet Spectroscopic Explorer (FUSE) and Space Telescope Imaging Spectrograph (STIS E140M) observations of the post-asymptotic giant branch star ZNG 1 in globular cluster Messier 5 (l=3.9, b=+47.7; d=7.5 kpc, z=+5.3 kpc). High velocity absorption is seen C IV, Si O VI, lower ionization species at LSR velocities -140 -110 km/s. conclude that this gas not circumstellar on basis photoionization models path length arguments. Thus, high along sight line first evidence...
The Berkeley spectrograph aboard the ORFEUS telescope made its second flight on 14 day ORFEUS-SPAS II mission of Space Shuttle Columbia in 1996 November/December. Approximately half available observing time was dedicated to spectrograph, which used by both principal and guest investigators. spectrograph's full bandpass is 390-1218 Å; here we discuss in-flight performance at far-ultraviolet wavelengths, most observations were performed. instrument's effective area peaks 8.9±0.5 cm2 near 1020...
We report the first Far-Ultraviolet Spectroscopic Explorer measurements of diffuse O VI (λλ1032, 1038) emission from general interstellar medium outside supernova remnants or superbubbles. observed a 30'' × region sky centered at l = 3150 and b -413. From intensities (2930 ± 290 [random] 410 [systematic] 1790 260 250 photons cm-2 s-1 sr-1 in λλ1032 1038, respectively), derived equations, assumptions about source location, we calculate intrinsic intensity, electron density, thermal pressure,...
view Abstract Citations (55) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discovery of a Fast Radiative Shock Wave in the Cygnus Loop Using Hopkins Ultraviolet Telescope Blair, William P. ; Long, Knox S. Vancura, Olaf Bowers, Charles W. Davidsen, Arthur F. Dixon, Van Dyke Durrance, Samuel T. Feldman, Paul D. Ferguson, Henry C. Henry, Richard Kimble, Randy A. Kriss, Gerard Kruk, Jeffrey Moos, H. Warren Gull, Theodore R. Observations...
We present a spectral analysis of the ultraviolet-bright star vZ 1128 in M3 based on observations with Far Ultraviolet Spectroscopic Explorer (FUSE), Space Telescope Imaging Spectrograph (STIS), and Keck High Resolution Echelle Spectrometer (HIRES). By fitting H i, He ii lines spectrum non-local thermodynamic equilibrium H–He models, we obtain Teff = 36 600 K, log g 3.95, N(He)/N(H) −0.84. The star's FUSE STIS spectra show photospheric absorption from C, N, O, Al, Si, P, S, Fe, Ni. No...