Timothy A. McKay
A5060700578- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Astronomical Observations and Instrumentation
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Remote Sensing in Agriculture
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Online Learning and Analytics
- CCD and CMOS Imaging Sensors
- Astrophysics and Star Formation Studies
- Scientific Research and Discoveries
- Career Development and Diversity
- Pulsars and Gravitational Waves Research
- Innovations in Educational Methods
- Medical Imaging Techniques and Applications
- Neutrino Physics Research
- Impact of Light on Environment and Health
- Calibration and Measurement Techniques
University of Michigan–Ann Arbor
2013-2024
Michigan United
2002-2021
Division of Undergraduate Education
2003-2013
Fermi National Accelerator Laboratory
1991-2010
Ann Arbor Center for Independent Living
1998-2005
Johns Hopkins University
2002
Rochester Institute of Technology
2002
U.S. National Science Foundation
2000
Association of Universities For Research In Astronomy
2000
University of Chicago
1991-1994
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...
We measure cosmological parameters using the three-dimensional power spectrum $P(k)$ from over 200 000 galaxies in Sloan Digital Sky Survey (SDSS) combination with Wilkinson Microwave Anisotropy Probe (WMAP) and other data. Our results are consistent a ``vanilla'' flat adiabatic cold dark matter model constant without tilt ${(n}_{s}=1),$ running tilt, tensor modes, or massive neutrinos. Adding SDSS information more than halves WMAP-only error bars on some parameters, tightening...
We present the large-scale correlation function measured from a spectroscopic sample of 46,748 luminous red galaxies Sloan Digital Sky Survey. The survey region covers 0.72 h-3 Gpc3 over 3816 deg2 and 0.16 < z 0.47, making it best yet for study structure. find well-detected peak in at 100 h-1 Mpc separation that is an excellent match to predicted shape location imprint recombination-epoch acoustic oscillations on low-redshift clustering matter. This detection demonstrates linear growth...
The spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample represents the final set of galaxies observed using original SDSS target selection criteria. We analyse clustering within this sample, including both luminous red and main samples, also include 2-degree Field Galaxy Redshift data. In total, comprises 893 319 over 9100 deg2. Baryon acoustic oscillations (BAO) are in power spectra measured for different slices redshift; allows us to constrain distance–redshift...
We measure the large-scale real-space power spectrum P(k) using a sample of 205,443 galaxies from Sloan Digital Sky Survey, covering 2417 square degrees with mean redshift z~0.1. employ matrix-based method pseudo-Karhunen-Loeve eigenmodes, producing uncorrelated minimum-variance measurements in 22 k-bands both clustering and its anisotropy due to redshift-space distortions, narrow well-behaved window functions range 0.02 h/Mpc < k 0.3h/Mpc. pay particular attention modeling, quantifying...
We present the 158 standard stars that define u'g'r'i'z' photometric system. These form basis for calibration of Sloan Digital Sky Survey. The defining instrument system and filters, observing process, reduction techniques, software used to create stellar network are all described. briefly discuss history star selection derivation a set transformation equations UBVRCIC system, plans future work.
We study the optical colors of 147,920 galaxies brighter than g* = 21, observed in five bands by Sloan Digital Sky Survey (SDSS) over ∼100 deg2 high Galactic latitude sky along celestial equator. The distribution g*-r* versus u*-g* color-color diagram is strongly bimodal, with an optimal color separator u*-r* 2.22. use visual morphology and spectral classification subsamples 287 500 galaxies, respectively, to show that two peaks correspond roughly early- (E, S0, Sa) late-type (Sb, Sc, Irr)...
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 moderate-resolution Keck spectroscopy of quasars at z = 5.82, 5.99, and 6.28, discovered by the Sloan Digital Sky Survey (SDSS). find that Lyα absorption in spectra these evolves strongly with redshift. To ∼ 5.7, as expected from an extrapolation lower redshifts. However, highest-redshift object, SDSSp J103027.10+052455.0 (z 6.28), average transmitted flux is 0.0038 ± 0.0026 times continuum level over 8450 Å < λ 8710 (5.95 zabs 6.16), consistent zero flux. Thus drops a factor...
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...
Lecture is prominent, but practices vary
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...
We present the power spectrum of reconstructed halo density field derived from a sample luminous red galaxies (LRGs) Sloan Digital Sky Survey (SDSS) Seventh Data Release (DR7). The has direct connection to underlying dark matter for k≤ 0.2 h Mpc−1, well into quasi-linear regime. This enables us use factor ∼8 more modes in cosmological analysis than an with kmax= 0.1 as was adopted SDSS team DR4 LRG sample. observed 0.02 < k Mpc−1 is fitted by our model: χ2= 39.6 40 degrees freedom...
The Northern Sky Variability Survey (NSVS) is a temporal record of the sky over optical magnitude range from 8 to 15.5. It was conducted in course first generation Robotic Optical Transient Search Experiment (ROTSE-I) using robotic system four co-mounted unfiltered telephoto lenses equipped with CCD cameras. survey Los Alamos, NM, and primarily covers entire northern sky. Some data southern fields between declinations 0 -38 deg also available, although fewer epochs noticeably lesser quality....
We discuss measurements of the properties ∼13,000 asteroids detected in 500 deg2 sky Sloan Digital Sky Survey (SDSS) commissioning data. The moving objects are magnitude range 14 < r* 21.5, with a baseline ∼5 minutes, resulting typical velocity errors ∼3%. Extensive tests show that sample is at least 98% complete, contamination rate less than 3%. find size distribution resembles broken power law, independent heliocentric distance: D-2.3 for 0.4 km ≲ D 5 km, and D-4 40 km. As consequence this...
The distribution in color and absolute magnitude is presented for 55,158 galaxies taken from the Sloan Digital Sky Survey redshift range 0.08 < z 0.12, as a function of galaxy number overdensity cylinder transverse radius 1 h-1 Mpc line-of-sight half-length 8 Mpc. In all environments, bulge-dominated (defined to be those with radial profiles best fitted large Sérsic indices) have color-magnitude diagram dominated by red which mode at fixed depends linearly on magnitude. Although most...
We use the abundance and weak-lensing mass measurements of Sloan Digital Sky Survey maxBCG cluster catalog to simultaneously constrain cosmology richness–mass relation clusters. Assuming a flat ΛCDM cosmology, we find σ8(Ωm/0.25)0.41 = 0.832 ± 0.033 after marginalization over all systematics. In common with previous studies, our error budget is dominated by systematic uncertainties, primary two being absolute scale masses clusters, uncertainty in scatter relation. Our constraints are fully...
We present a large catalog of optically selected galaxy clusters from the application new Gaussian Mixture Brightest Cluster Galaxy (GMBCG) algorithm to SDSS Data Release 7 data. The detects by identifying red-sequence plus brightest cluster (BCG) feature, which is unique for and does not exist among field galaxies. Red-sequence clustering in color space detected using an Error Corrected Model. run GMBCG on 8240 deg2 photometric data DR7 assemble largest ever optical catalog, consisting over...
This is the fourth paper in a series aimed at finding high-redshift quasars from five-color imaging data taken along Celestial Equator by SDSS. during its commissioning phase. In this paper, we use color-selected sample of 39 luminous presented Paper III to derive evolution quasar luminosity function over range 3.6