Paul Green
A5100675016- Astronomy and Astrophysical Research
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Musicology and Musical Analysis
- Manufacturing Process and Optimization
- Traumatic Brain Injury Research
- Advanced Vision and Imaging
- Nuclear Physics and Applications
- Optical Systems and Laser Technology
- Hydrocarbon exploration and reservoir analysis
- Advanced X-ray Imaging Techniques
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Dark Matter and Cosmic Phenomena
- History and Developments in Astronomy
- Musculoskeletal pain and rehabilitation
- Theater, Performance, and Music History
- Geology and Paleoclimatology Research
Makerere University
2022-2024
Portland State University
2024
Center for Astrophysics Harvard & Smithsonian
2014-2023
University of Oxford
2022
Centre for Human Genetics
2022
The University of Texas at Austin
2022
National Physical Laboratory
2015-2020
Smithsonian Astrophysical Observatory
2000-2019
Wellcome Sanger Institute
2017
Texas Tech University
2014-2017
The third generation of the Sloan Digital Sky Survey (SDSS-III) took data from 2008 to 2014 using original SDSS wide-field imager, and an upgraded multi-object fiber-fed optical spectrograph, a new near-infrared high-resolution novel interferometer. All SDSS-III are now made public. In particular, this paper describes Data Release 11 (DR11) including all acquired through 2013 July, 12 (DR12) adding July (including included in previous releases), marking end observing. Relative our public...
Mid-infrared photometry provides a robust technique for identifying active galaxies. While the ultraviolet to mid-infrared continuum of normal galaxies is dominated by composite stellar black body curve and peaks at approximately 1.6 microns, power law. Consequently, with sufficient wavelength baseline, one can easily distinguish AGN from populations. Mirroring tendency be bluer than in ultraviolet, where (and stars) sample blue, rising portion spectra, tend redder mid-infrared, red, falling...
We present 1210 Johnson/Cousins B, V, R, and I photometric observations of 22 recent Type Ia supernovae (SNe Ia): SNe 1993ac, 1993ae, 1994M, 1994S, 1994T, 1994Q, 1994ae, 1995D, 1995E, 1995al, 1995ac, 1995ak, 1995bd, 1996C, 1996X, 1996Z, 1996ab, 1996ai, 1996bk, 1996bl, 1996bo, 1996bv. Most the photometry was obtained at Fred Lawrence Whipple Observatory Harvard-Smithsonian Center for Astrophysics in a cooperative observing plan aimed improving database Ia. The redshifts sample range from cz =...
We present multiband photometry of 185 type-Ia supernovae (SNe Ia), with over 11,500 observations. These were acquired between 2001 and 2008 at the F. L. Whipple Observatory Harvard-Smithsonian Center for Astrophysics (CfA). This sample contains largest number homogeneously observed reduced nearby SNe Ia (z ≲ 0.08) published to date. It more than doubles sample, bringing SN cosmology point where systematic uncertainties dominate. Our natural system has a precision ≲0.02 mag in BVRIr'i' ≲0.04...
The Extended Baryon Oscillation Spectroscopic Survey (eBOSS) will conduct novel cosmological observations using the BOSS spectrograph at Apache Point Observatory. Observations be simultaneous with Time Domain (TDSS) designed for variability studies and Identification of eROSITA Sources (SPIDERS) program X-ray sources. eBOSS use four different tracers to measure distance-redshift relation baryon acoustic oscillations (BAO). Using more than 250,000 new, spectroscopically confirmed luminous red...
We present the final Sloan Digital Sky Survey IV (SDSS-IV) quasar catalog from Data Release 16 of extended Baryon Oscillation Spectroscopic (eBOSS). This comprises largest selection spectroscopically confirmed quasars to date. The full includes two sub-catalogs: a "superset" all SDSS-IV/eBOSS objects targeted as containing 1,440,615 observations and quasar-only 750,414 quasars, including 225,082 new appearing in an SDSS data release for first time, well known SDSS-I/II/III. automated...
We present the Data Release 14 Quasar catalog (DR14Q) from extended Baryon Oscillation Spectroscopic Survey (eBOSS) of Sloan Digital Sky IV (SDSS-IV). This includes all SDSS-IV/eBOSS objects that were spectroscopically targeted as quasar candidates and are confirmed quasars via a new automated procedure combined with partial visual inspection spectra, have luminosities $M_{\rm i} \left[ z=2 \right] < -20.5$ (in $Λ$CDM cosmology $H_0 = 70 \ {\rm km s^{-1} Mpc ^{-1}}$, $Ω_{\rm M} 0.3$, Λ}...
Abstract “Changing-look active galactic nuclei” (CL AGN) show dramatic, rapid changes in optical/UV continuum and broad-line emission. The majority of CL AGN have been found dimming as “turn-off” because most selection methods start from samples spectroscopically confirmed quasars. We present here a sample 82 “turn-on” AGN, 70 which are newly identified. turn-on selected classified galaxies with subsequent significant dramatic variability both the optical mid-infrared bands, indicating...
We present a measure of the hard (2-8 keV) X-ray luminosity function (XLF) Active Galactic Nuclei up to z~5. At high redshifts, wide area coverage Chandra Multiwavength Project is crucial detect rare and luminous (Lx > 10^44 erg s^-1) AGN. The inclusion samples from deeper published surveys, such as Deep Fields, allows us span lower Lx range XLF. Our sample selected both (z < 3; f(2-8 6.3x10^-16 cm^-2 soft f(0.5-2.0 1.0x10^-16 energy band detections. Within our optical magnitude limits...
This study describes the development of a Minnesota Multiphasic Personality Inventory (MMPI-2) scale designed to detect negative response bias in forensic neuropsychological or disability assessment settings. The Response Bias Scale (RBS) consists 28 MMPI-2 items that discriminated between persons who passed failed Word Memory Test (WMT), Computerized Assessment (CARB), and/or Malingering (TOMM) sample 1,212 nonhead-injury claimants. Incremental validity RBS was evaluated by comparing its...
The AGN and Galaxy Evolution Survey (AGES) is a redshift survey covering, in its standard fields, 7.7 square degrees of the Bootes field NOAO Deep Wide-Field (NDWFS). final sample consists 23745 redshifts. There are well-defined galaxy samples ten bands (the Bw, R, I, J, K, IRAC 3.6, 4.5, 5.8 8.0 micron MIPS 24 bands) to limiting magnitude I<20 mag for spectroscopy. For these galaxies, we obtained 18163 redshifts from 35200 where random sparse sampling was used define statistically complete...
We report the discovery of a new 'changing-look' quasar, SDSS J101152.98+544206.4, through repeat spectroscopy from Time Domain Spectroscopic Survey. This is an addition to small but growing set quasars whose blue continua and broad optical emission lines have been observed decline by large factor on time-scale approximately decade. The 5100 Å monochromatic continuum luminosity this quasar drops >9.8 in rest-frame time interval <9.7 yr, while Hα 55 same amount time. width line increases dim...
Abstract Active galactic nuclei (AGNs) that show strong rest-frame optical/UV variability in their blue continuum and broad line emission are classified as changing-look AGN, or at higher luminosities, quasars (CLQs). These surprisingly large sometimes rapid transitions challenge accepted models of quasar physics duty cycles, offer several new avenues for study host galaxies, open a wider interpretation the cause differences between narrow-line AGN. To better characterize extreme...
We present a detailed characterization of the 849 broad-line quasars from Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Our quasar sample covers redshift range 0.1<z<4.5 and is flux-limited to i_PSF<21.7 without any other cuts on properties. The main includes: 1) spectral measurements continuum broad emission lines for individual objects coadded first-season spectroscopy in 2014; 2) identification narrow absorption spectra; 3) optical variability properties multi-epoch...
Depth of field (DOF), the range scene depths that appear sharp in a photograph, poses fundamental tradeoff photography---wide apertures are important to reduce imaging noise, but they also increase defocus blur. Recent advances computational modify acquisition process extend DOF through deconvolution. Because deconvolution quality is tight function frequency power spectrum kernel, designs with high spectra desirable. In this paper we study how design effective extended-DOF systems, and show...
By definition, false positives occur when an otherwise very easy symptom validity test (SVT) or effort is failed because of cognitive impairment and not poor effort. Therefore, the highest rate will be found in those groups with most severe impairment. For that reason, it important to study people evaluating specificity SVTs. Some various types dementia, notably Alzheimer's disease, suffer from memory other abilities. In this study, patients possible probable dementia were tested Word Memory...
Reverberation mapping (RM) measurements of broad-line region (BLR) lags in z>0.3 quasars are important for directly measuring black hole masses these distant objects, but so far there have been limited attempts and success given the practical difficulties RM this regime. Here we report preliminary results 15 BLR lag from Sloan Digital Sky Survey Mapping (SDSS-RM) project, a dedicated program with multi-object spectroscopy designed over wide redshift range. The based on 2014 spectroscopic...
The increasing availability of 3D seismic data from sedimentary basins at volcanic and non-volcanic continental margins has provided fundamental new insights into both the storage transport magma in crust. As global hydrocarbon exploration increasingly focuses on passive margin with evidence for past intrusive extrusive igneous activity, constraining distribution, timing pathways magmatism these is essential to reduce risk. Producing prospective Australian where systems have been identified...
The Sloan Digital Sky Survey Reverberation Mapping project (SDSS-RM) is a dedicated multi-object RM experiment that has spectroscopically monitored sample of 849 broad-line quasars in single 7 deg$^2$ field with the SDSS-III BOSS spectrograph. quasar flux-limited to i_psf=21.7 mag, and covers redshift range 0.1<z<4.5. Optical spectroscopy was performed during 2014 Jan-Jul dark/grey time, an average cadence ~4 days, totaling more than 30 epochs. Supporting photometric monitoring g i bands...
Abstract Despite their factor of ∼10 8 difference in black hole mass, several lines evidence suggest possible similarities between accretion flows active galactic nuclei (AGN) and Galactic X-ray binaries. However, it is still unclear whether the geometry disk–corona system binaries directly scales up to AGN this analogy holds different states. We test AGN/X-ray binary by comparing observed correlations UV–to–X-ray spectral index ( α OX ) Eddington ratio those predicted from observations...
Abstract We present reverberation mapping results for the Mg ii λ 2800 Å broad emission line in a sample of 193 quasars at <?CDATA $0.35\lt z\lt 1.7$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>0.35</mml:mn> <mml:mo><</mml:mo> <mml:mi>z</mml:mi> <mml:mn>1.7</mml:mn> </mml:math> with photometric and spectroscopic monitoring observations from Sloan Digital Sky Survey Reverberation Mapping project during 2014–2017. find significant time lags between...
Abstract Active galactic nuclei (AGN) can vary significantly in their rest-frame optical/UV continuum emission, and with strong associated changes broad line on much shorter timescales than predicted by standard models of accretion disks around supermassive black holes. Most such changing-look or changing-state AGN—and at higher luminosities, quasars (CLQs)—have been found via spectroscopic follow-up known showing photometric variability. The Time Domain Spectroscopic Survey the Sloan...
This paper analyses the impact of urban mobility (UM) on air pollution by studying effects an intervention local quality. The study focuses PM2.5 level in Kampala, capital Uganda, and considers COVID-19 as unintentional intervention. city was obtained from a network low-cost calibrated sensors, while UM is characterized open-access Google reports. period under consideration excludes weeks immediately before after first lockdown. data were deweathered using machine learning technique random...
Abstract “Changing-look” active galactic nuclei (CL-AGNs) challenge our basic ideas about the physics of accretion flows and circumnuclear gas around supermassive black holes. Using first-year Sloan Digital Sky Survey V (SDSS-V) repeated spectroscopy nearly 29,000 previously known (AGNs), combined with dedicated follow-up spectroscopy, publicly available optical light curves, we have identified 116 CL-AGNs where (at least) one broad emission line has essentially (dis-)appeared, as well 88...
We have carried out a survey with the Chandra X-Ray Observatory of sample 10 bright broad absorption line (BAL) quasars (QSOs). Eight sources are detected. The six brightest only high-ionization BALs (hiBALs), while four faintest all show low-ionization (loBALs). perform combined spectral fit for hiBAL QSOs (384 counts total; 0.5-6 keV) to determine mean parameters this sample. derive an underlying best-fit power-law slope Γ = 1.8 ± 0.35, which is consistent radio-quiet from ASCA, but BAL...