S. D. Friedman
A5028245956- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Photocathodes and Microchannel Plates
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Spectroscopy and Laser Applications
- Cosmology and Gravitation Theories
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Scientific Research and Discoveries
- Superconducting and THz Device Technology
- Molecular Spectroscopy and Structure
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- History and Developments in Astronomy
- Optical Systems and Laser Technology
- Spacecraft and Cryogenic Technologies
- 3D Modeling in Geospatial Applications
Corewell Health
2024
Trenton Psychiatric Hospital
2024
Ford Motor Company (United States)
2024
Trinity Health
2024
McLaren Health Care
2024
Space Telescope Science Institute
2010-2023
Tulane University
2014
Johns Hopkins University
1990-2013
University of California, Los Angeles
2011
Fuse (United States)
2000
The Sloan Digital Sky Survey (SDSS) will provide the data to support detailed investigations of distribution luminous and nonluminous matter in universe: a photometrically astrometrically calibrated digital imaging survey π sr above about Galactic latitude 30° five broad optical bands depth g' ∼ 23 mag, spectroscopic approximately 106 brightest galaxies 105 quasars found photometric object catalog produced by survey. This paper summarizes observational parameters products SDSS serves as an...
This paper describes the Seventh Data Release of Sloan Digital Sky Survey (SDSS), marking completion original goals SDSS and end phase known as SDSS-II. It includes 11,663 deg2 imaging data, with most ∼2000 increment over previous data release lying in regions low Galactic latitude. The catalog contains five-band photometry for 357 million distinct objects. survey also repeat on a 120° long, 25 wide stripe along celestial equator Southern Cap, some covered by many 90 individual runs. We...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere collect spectra ≈106 galaxies, 100,000 quasars, 30,000 stars, serendipity targets. In 2001 June, SDSS released to general astronomical community its early data release, roughly 462 deg2 including almost 14 million detected objects 54,008 follow-up spectra. were collected in drift-scan mode five bandpasses (u, g, r, i, z); our 95% completeness...
We have created a variety of composite quasar spectra using homogeneous data set over 2200 from the Sloan Digital Sky Survey (SDSS). The sample spans redshift range 0.044 ≤ z 4.789 and an absolute r' magnitude -18.0 to -26.5. input cover observed wavelength 3800–9200 Å at resolution 1800. median covers rest-wavelength 800 8555 reaches peak signal-to-noise ratio 300 per 1 element in rest frame. identified 80 emission-line features spectrum. Emission-line shifts relative nominal laboratory...
This paper describes the Sixth Data Release of Sloan Digital Sky Survey. With this data release, imaging northern Galactic cap is now complete. The survey contains images and parameters roughly 287 million objects over 9583 deg2, including scans a large range latitudes longitudes. also includes 1.27 spectra stars, galaxies, quasars, blank sky (for subtraction) selected 7425 deg2. release much more stellar spectroscopy than was available in previous releases detailed estimates temperatures,...
The Sloan Digital Sky Survey (SDSS) has validated and made publicly available its Second Data Release. This data release consists of 3324 deg2 five-band (ugriz) imaging with photometry for over 88 million unique objects, 367,360 spectra galaxies, quasars, stars, calibrating blank sky patches selected 2627 this area, tables measured parameters from these data. reach a depth r ≈ 22.2 (95% completeness limit point sources) are photometrically astrometrically calibrated to 2% rms 100 mas per...
This paper describes the Fourth Data Release of Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through 2004 June. The release includes five-band photometric for 180 million objects selected over 6670 deg2 and 673,280 spectra galaxies, quasars, stars from 4783 those imaging using standard SDSS target selection algorithms. These numbers represent a roughly 27% increment Third Release; previous releases are included in present release. also an additional 131,840...
We present the design and performance of multi-object fiber spectrographs for Sloan Digital Sky Survey (SDSS) their upgrade Baryon Oscillation Spectroscopic (BOSS). Originally commissioned in Fall 1999 on 2.5-m aperture Telescope at Apache Point Observatory, produced more than 1.5 million spectra SDSS SDSS-II surveys, enabling a wide variety Galactic extra-galactic science including first observation baryon acoustic oscillations 2005. The were upgraded 2009 are currently use BOSS, flagship...
The Sloan Digital Sky Survey has validated and made publicly available its First Data Release. This consists of 2099 square degrees five-band (u, g, r, i, z) imaging data, 186,240 spectra galaxies, quasars, stars calibrating blank sky patches selected over 1360 this area, tables measured parameters from these data. data go to a depth r ~ 22.6 are photometrically astrometrically calibrated 2% rms 100 milli-arcsec per coordinate, respectively. cover the range 3800--9200 A, with resolution...
This paper describes the Third Data Release of Sloan Digital Sky Survey (SDSS). release, containing data taken up through 2003 June, includes imaging in five bands over 5282 deg2, photometric and astrometric catalogs 141 million objects detected these data, spectra 528,640 selected 4188 deg2. The pipelines analyzing both images spectroscopy are unchanged from those used our Second Release.
This paper describes the Fifth Data Release (DR5) of Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through June 2005 and represents completion SDSS-I project (whose successor, SDSS-II will continue mid-2008). It five-band photometric for 217 million objects selected over 8000 square degrees, 1,048,960 spectra galaxies, quasars, stars from 5713 degrees that imaging data. These numbers represent a roughly 20% increment those Fourth Release; previous releases are...
The Far Ultraviolet Spectroscopic Explorer satellite observes light in the far-ultraviolet spectral region, 905-1187 Å, with a high resolution. instrument consists of four co-aligned prime-focus telescopes and Rowland spectrographs microchannel plate detectors. Two telescope channels use Al : LiF coatings for optimum reflectivity between approximately 1000 1187 other two SiC optimized throughput 905 1105 Å. gratings are holographically ruled to correct largely astigmatism minimize scattered...
In the course of its commissioning observations, Sloan Digital Sky Survey (SDSS) has produced one largest redshift samples galaxies selected from CCD images. Using 11,275 complete to r* = 17.6 over 140 deg2, we compute luminosity function in band a range -23 < M -16 (for h 1). The result is well-described by Schechter with parameters ϕ* (1.46 ± 0.12) × 10-2 h3 Mpc-3, M* -20.83 0.03, and α -1.20 0.03. implied density j ≈ (2.6 0.3) 108h L⊙ Mpc-3. We find that surface brightness selection...
We present the first measurements of clustering in Sloan Digital Sky Survey (SDSS) galaxy redshift survey. Our sample consists 29,300 galaxies with redshifts 5,700 km/s < cz 39,000 km/s, distributed several long but narrow (2.5-5 degree) segments, covering 690 square degrees. For full, flux-limited sample, redshift-space correlation length is approximately 8 Mpc/h. The two-dimensional function ξ(r_p,π) shows clear signatures both small-scale, ``fingers-of-God'' distortion caused by...
The launch of the Far Ultraviolet Spectroscopic Explorer (FUSE) has been followed by an extensive period calibration and characterization as part preparation for normal satellite operations. Major tasks carried out during this include initial coalignment, focusing, four instrument channels a preliminary measurement resolution throughput performance instrument. We describe results from test program present estimates on-orbit FUSE based on combination these data prelaunch laboratory measurements.
Abstract This paper characterizes the actual science performance of James Webb Space Telescope (JWST), as determined from six month commissioning period. We summarize spacecraft, telescope, instruments, and ground system, with an emphasis on differences pre-launch expectations. Commissioning has made clear that JWST is fully capable achieving discoveries for which it was built. Moreover, almost across board, better than expected; in most cases, will go deeper faster expected. The telescope...
Abstract The Mid-Infrared Instrument (MIRI) extends the reach of James Webb Space Telescope (JWST) to 28.5 μ m. It provides subarcsecond-resolution imaging, high sensitivity coronagraphy, and spectroscopy at resolutions λ /Δ ∼ 100–3500, with high-resolution mode employing an integral field unit provide spatial data cubes. resulting broad suite capabilities will enable huge advances in studies over this wavelength range. This overview describes history acquiring capability for JWST. discusses...
We report the first ensemble results from Far Ultraviolet Spectroscopic Explorer survey of molecular hydrogen in lines sight with AV ≳ 1 mag. have developed techniques for fitting computed profiles to low-J H2, and thus determining column densities J = 0 1, which contain ≳99% total H2. From these ancillary data we derived H2 densities, fractions, kinetic temperatures 23 sight. This is significant sample ~1021 cm-2, measured through UV absorption bands. also compiled a set extinction sight,...
Echelle spectra of HD 183143 [B7Iae, E(B − V) = 1.27] were obtained on three nights, at a resolving power R 38,000 and with signal-to-noise ratio ≈ 1000 6400 Å in the final, combined spectrum. A catalog is presented 414 diffuse interstellar bands (DIBs) measured between 3900 8100 this The central wavelengths, widths (FWHM), equivalent nearly all are tabulated, along minimum uncertainties latter. Among bands, 135 (or 33%) not reported four previous, modern surveys DIBs various stars,...
Analyses of spectra obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) satellite, together from Copernicus and interstellar medium absorption profile spectrograph (IMAPS) instruments, reveal an unexplained, very wide range in observed deuterium/hydrogen (D/H) ratios for gas Galactic disk beyond Local Bubble. We argue that spatial variations depletion deuterium onto dust grains can explain these local gas-phase D/H ratios. present a variable model naturally explains constant...
We present an empirical investigation of the colors quasars in Sloan Digital Sky Survey (SDSS) photometric system. The sample studied includes 2625 with SDSS photometry: 1759 found during spectroscopic commissioning and follow-up observations on other telescopes, 50 matches to FIRST quasars, 573 from NASA Extragalactic Database, 243 two or more these sources. are distributed a 25 wide stripe centered celestial equator covering ∼529 deg2. Positions (accurate 02) magnitudes given for 898 known...
We report total abundances and related parameters for the full sample of Far Ultraviolet Spectroscopic Explorer survey molecular hydrogen in 38 translucent lines sight. New results are presented "second half" involving 15 sight to supplement data first 23 already published. assess correlations between various extinction sample, which covers a broader range conditions than initial sample. In particular, we now able confirm that many, but not all, with shallow far-UV curves large values...
Echelle spectra of the double-lined spectroscopic binary HD 204827 were obtained on five nights, at a resolving power R = 38,000 and with S/N 750 near 6000 Å in final, combined spectrum. The stars show E(B − V) 1.11 spectral types O9.5 V B0.5 III. A catalog is presented 380 diffuse interstellar bands (DIBs) measured between 3900 8100 stars' central wavelengths, widths (FWHM), equivalent nearly all are tabulated, along minimum uncertainties latter. reliable removal very weak stellar lines...
We establish correlations between equivalent widths of eight diffuse interstellar bands (DIBs), and examine their with atomic hydrogen, molecular EB-V . The DIBs are centered at \lambda\lambda 5780.5, 6204.5, 6283.8, 6196.0, 6613.6, 5705.1, 5797.1, 5487.7, in decreasing order Pearson\^as correlation coefficient N(H) (here defined as the column density neutral hydrogen), ranging from 0.96 to 0.82. find width \lambda 5780.5 is better correlated densities H than E(B-V) or H2, confirming earlier...
The Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST) provides measurements over wavelength range 5 to 28.5 μm. MIRI has, within a single "package," four key scientific functions: photometric imaging, coronagraphy, single-source low-spectral resolving power (R ∼ 100) spectroscopy, and medium-resolving 1500 3500) integral field spectroscopy. An associated cooler system maintains at its operating temperature of < 6.7 K. This paper describes driving principles behind...