Patrick B. Hall
A5022931844- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Radio Astronomy Observations and Technology
- Adaptive optics and wavefront sensing
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Black Holes and Theoretical Physics
- Statistical and numerical algorithms
- Remote Sensing in Agriculture
- Astro and Planetary Science
- Relativity and Gravitational Theory
- Particle Accelerators and Free-Electron Lasers
- Planetary Science and Exploration
- Pulsars and Gravitational Waves Research
- Advanced Statistical Methods and Models
- Plant Water Relations and Carbon Dynamics
- Computational Physics and Python Applications
York University
2015-2024
WestRock (United States)
2024
American College of Foot and Ankle Surgeons
2009
Baton Rouge Clinic
2009
Podiatry Institute
2009
Princeton University
2001-2008
Drexel University
2008
University of Washington
2008
University of Illinois Urbana-Champaign
2008
Pennsylvania State University
2008
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...
We examine the properties of host galaxies 22,623 narrow-line AGN with 0.02
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...
The Baryon Oscillation Spectroscopic Survey (BOSS) is designed to measure the scale of baryon acoustic oscillations (BAO) in clustering matter over a larger volume than combined efforts all previous spectroscopic surveys large-scale structure. BOSS uses 1.5 million luminous galaxies as faint i = 19.9 10,000 deg2 BAO redshifts z < 0.7. Observations neutral hydrogen Lyα forest more 150,000 quasar spectra (g 22) will constrain redshift range 2.15 3.5. Early results from include first detection...
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,...
We present an analysis of the mid-infrared (MIR) and optical properties type 1 (broad-line) quasars detected by Spitzer Space Telescope. The MIR color-redshift relation is characterized to z ~ 3, with predictions = 7. demonstrate how combining colors can yield even more efficient selection active galactic nuclei (AGNs) than or alone. Composite spectral energy distributions (SEDs) are constructed for 259 both Sloan Digital Sky Survey photometry, supplemented near-IR, GALEX, VLA, ROSAT data,...
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 describe the algorithm for selecting quasar candidates optical spectroscopy in Sloan Digital Sky Survey. Quasar are selected via their non-stellar colors "ugriz" broad-band photometry, and by matching unresolved sources to FIRST radio catalogs. The automated is sensitive quasars at all redshifts lower than z=5.8. Extended also targeted as low-redshift order investigate evolution of Active Galactic Nuclei (AGN) faint end luminosity function. Nearly 95% previously known recovered (based on...
We present the fifth edition of Sloan Digital Sky Survey (SDSS) Quasar Catalog, which is based upon SDSS Seventh Data Release. The catalog, contains 105,783 spectroscopically confirmed quasars, represents conclusion SDSS-I and SDSS-II quasar survey. catalog consists objects that have luminosities larger than M_i = -22.0 (in a cosmology with H_0 70 km/s/Mpc Omega_M 0.3, Omega_Lambda 0.7) at least one emission line FWHM 1000 km/s or interesting/complex absorption features, are fainter i > 15.0...
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...
We present a compilation of properties the 105,783 quasars in SDSS Data Release 7 (DR7) quasar catalog. In this value-added product, we compile continuum and emission line measurements around Halpha, Hbeta, MgII CIV regions, as well other quantities such radio properties, broad absorption (BALQSO) flags, disk emitters. also virial black hole mass estimates based on various calibrations. For fiducial use Vestergaard & Peterson (VP06) calibrations for Hbeta CIV, our own calibration which...
We determine the number counts and z = 0-5 luminosity function for a well-defined, homogeneous sample of quasars from Sloan Digital Sky Survey (SDSS). conservatively define most uniform statistical possible, consisting 15,343 within an effective area 1622 deg2 that was derived parent 46,420 spectroscopically confirmed broad-line in 5282 imaging data SDSS Data Release 3. The extends i 15 to 19.1 at ≲ 3 20.2 ≳ agree well with results Two Degree Field QSO Redshift (2QZ) redshifts luminosities...
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...
We investigate the extent to which Palomar-Green (PG) Bright Quasar Survey (BQS) is complete and representative of general quasar population by comparing it with imaging spectroscopy from Sloan Digital Sky (SDSS). A comparison SDSS PG photometry both stars quasars reveals need apply a color magnitude recalibration data. Using photometric catalog, we define PG's parent sample objects that are not main-sequence simulate selection this using criteria errors. This simulation shows effective U -...
We present the fourth edition of Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog contains 77,429 objects; this is an increase over 30,000 entries since previous edition. consists objects in SDSS Fifth Data Release that have luminosities larger than Mi = -22.0 (in a cosmology with H0 70 km s-1 Mpc-1, ΩM 0.3, and ΩΛ 0.7), at least one emission line FWHM 1000 or interesting/complex absorption features, are fainter i ≈ 15.0, highly reliable redshifts. area covered by ≈5740 deg2....
Using a sample of over 25,000 spectroscopically confirmed quasars from the Sloan Digital Sky Survey, we show how quasar variability in rest-frame optical/UV regime depends on time lag, luminosity, rest wavelength, redshift, presence radio and X-ray emission, broad absorption line systems. Imaging photometry is compared with three-band spectrophotometry obtained at later epochs spanning lags up to about 2 yr. The large size wide range parameter values allow dependence be isolated as function...
Using a sample of 30,000 quasars from SDSS-DR7, we explore the range properties exhibited by high-ionization, broad emission lines, such as CIV 1549. Specifically investigate anti-correlation between L_UV and line EQW (the Baldwin Effect) "blueshifting" high-ionization lines. The blueshift is nearly ubiquitous, with mean shift 810 km/s for radio-quiet (RQ) 360 radio-loud (RL) quasars, Effect present in both RQ RL samples. Composite spectra are constructed function attempt to reveal empirical...
We present a total of 4784 unique broad absorption line quasars from the Sloan Digital Sky Survey Third Data Release. An automated algorithm was used to match continuum each quasar and identify regions flux at least 10% below over velocity range 1000 km/s in CIV MgII regions. The model selected as best-fit set template spectra binned luminosity, emission width, redshift, with power-law spectral index amount dust reddening additional free parameters. characterize our sample through...
We study the two-point correlation function of a uniformly selected sample 4426 luminous optical quasars with redshift 2.9 ≤ z 5.4 over 4041 deg2 from Fifth Data Release Sloan Digital Sky Survey. fit power-law to projected wp(rp) marginalize redshift-space distortions and errors. For real-space form ξ(r) = (r/r0)-γ, fitted parameters in comoving coordinates are r0 15.2 ± 2.7 h-1 Mpc γ 2.0 0.3, scale range 4 rp 150 Mpc. Thus high-redshift appreciably more strongly clustered than their ≈ 1.5...
We present the Data Release 12 Quasar catalog (DR12Q) from Baryon Oscillation Spectroscopic Survey (BOSS) of SDSS-III. This includes all SDSS-III/BOSS objects that were spectroscopically targeted as quasar candidates during full survey and are confirmed quasars via visual inspection spectra, have luminosities Mi[z=2]2.15 is about an order magnitude greater than number z>2.15 known prior to BOSS. Redshifts FWHMs provided for strongest emission lines (CIV, CIII], MgII). The identifies...