M. Richmond
A5082544394- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- History and Developments in Astronomy
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Distributed and Parallel Computing Systems
- Cosmology and Gravitation Theories
- Parallel Computing and Optimization Techniques
- Neutrino Physics Research
- Geophysics and Gravity Measurements
- Satellite Image Processing and Photogrammetry
- High-pressure geophysics and materials
- Distributed systems and fault tolerance
- Spacecraft and Cryogenic Technologies
Saskatchewan Health
2025
Saskatchewan Health Authority
2025
Rochester Institute of Technology
2015-2024
Naval Information Warfare Systems Command
2015
Towson University
2015
Seikei University
2014
Osaka Kyoiku University
2014
IBM (United States)
2003-2010
IBM Research - Almaden
2010
New Mexico Institute of Mining and Technology
2004-2010
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...
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...
Aims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z< 0.1), all three seasons (0.05 <z< 0.4), years (0.2 1), it totals 740 spectroscopically confirmed supernovae with high-quality light curves.
We describe the algorithm that selects main sample of galaxies for spectroscopy in Sloan Digital Sky Survey from photometric data obtained by imaging survey. Galaxy properties are measured using Petrosian magnitude system, which measures flux apertures determined shape surface brightness profile. The metric aperture used is essentially independent cosmological dimming, foreground extinction, sky brightness, and galaxy central brightness. consists with r-band r < 17.77 half-light 24.5...
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 measure the large-scale real-space power spectrum $P(k)$ using luminous red galaxies (LRGs) in Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological parameters from Wilkinson Microwave Anisotropy Probe (WMAP). employ a matrix-based estimation method Pseudo-Karhunen-Lo\`eve eigenmodes, producing uncorrelated minimum-variance measurements 20 $k$-bands of both clustering its anisotropy due redshift-space distortions, with narrow well-behaved window...
We describe the target selection and resulting properties of a spectroscopic sample luminous red galaxies (LRGs) from imaging data Sloan Digital Sky Survey (SDSS). These are selected on basis color magnitude to yield intrinsically that extends fainter farther than main flux-limited portion SDSS galaxy sample. The is designed impose passively evolving luminosity rest-frame cut redshift 0.38. Additional, yet more included ∼0.5. Approximately 12 these per square degree targeted for...
We present measurements of the Hubble diagram for 103 Type Ia supernovae (SNe) with redshifts 0.04 < z 0.42, discovered during first season (Fall 2005) Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey. These data fill in redshift "desert" between low- and high-redshift SN surveys. combine SDSS-II new distance estimates published from ESSENCE survey, Legacy Survey, Space Telescope, a compilation nearby measurements. Combining Baryon Acoustic Oscillations SDSS Luminous Red Galaxy sample...
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z 0.35) Type Ia supernovae (SNe Ia) using repeated five-band (ugriz) imaging over an area of 300 sq. deg. survey region is stripe 2.5° wide centered the celestial equator in Southern Galactic Cap that been imaged numerous times earlier years, enabling construction deep reference image discovery new objects. Supernova observations are being...
We present photometric and spectroscopic observations of SN 1991bg, a very peculiar Type Ia supernova located in the outskirts E1 galaxy NGC 4374 (M84) Virgo cluster. At maximum brightness 1991bg was 1.6 mag subluminous V 2.5 B, compared with normal SNe Ia. The colors were unusually red, but object not significantly reddened by dust. decline from certainly quite steep; we measure an initial linear fading 0.10 d^-1^ rather than typical value 0.06 for Ia, late- time 0.034 0.026 d^-1^....
We quantify the variability of faint unresolved optical sources using a catalog based on multiple SDSS imaging observations.The covers stripe 82, which lies along celestial equator in southern Galactic hemisphere (22 h 24 m < J2000:0 04 08 , À1:27 þ1:27 $290 deg 2 ), and contains 34 million photometric observations ugriz system for 748,084 at high latitudes (b À20 ) that were observed least four times each ugri bands (with median 10 obtained over $6 yr).In bandpass we compute various...
view Abstract Citations (347) References (25) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Peculiar Type IA SN 1991T: Detonation of a White Dwarf? Filippenko, Alexei V. ; Richmond, Michael W. Matheson, Thomas Shields, Joseph C. Burbidge, E. Margaret Cohen, Ross D. Dickinson, Mark Malkan, Matthew A. Nelson, Brant Pietz, Jochen Schlegel, David Schmeer, Patrick Spinrad, Hyron Steidel, Charles Tran, Hien Wren, William 1991T was peculiar object whose...
The photometric calibration of the Sloan Digital Sky Survey (SDSS) is a multi-step process which involves data from three different telescopes: 1.0-m telescope at US Naval Observatory (USNO), Flagstaff Station, Arizona (which was used to establish SDSS standard star network); 0.5-m Photometric Telescope (PT) Apache Point (APO), New Mexico calculates nightly extinctions and calibrates secondary patch transfer fields); 2.5-m APO obtains imaging for proper). In this paper, we describe Monitor...
view Abstract Citations (302) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Steps toward Determination of the Size and Structure Broad-Line Region in Active Galactic Nuclei. II. an Intensive Study NGC 5548 at Optical Wavelengths Peterson, B. M. ; Balonek, T. J. Barker, E. S. Bechtold, Bertram, R. Bochkarev, N. G. Bolte, Bond, D. Boroson, A. Carini, Carone, Christensen, Clements, Cochran, L. Cohen, Crampton, Dietrich, Elvis, Ferguson,...
We present photometry of SN 1993J in M81 (NGC 3031) the Johnson- Cousins UBVRI system, starting within three days probable time explosion and ending 120 later. The reddening along line sight to this supernova is uncertain-there evidence for small (E(B- V) ~ 0.08 mag] moderate [E(B- 0.32 values. For each value, we correct observed fluxes extinction calculate evolution sum all optical flux, which contains roughly half supernova's total flux during period observation. also fit colors a Planck...
view Abstract Citations (202) References (46) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS SN 1993J: The Optical Properties of its Progenitor Aldering, G. ; Humphreys, R. M. Richmond, We present a homogeneous set UBVR_C_I_C_ photometry the progenitor 1993J in M81. is inconsistent with spectral energy distribution single star for any reasonable extinction (A_V_ < 3 mag). Models which include spectra red and blue star, or plus net spectrum an OB association,...
The Sloan Digital Sky Survey-II Supernova Survey has identified a large number of new transient sources in 300 deg2 region along the celestial equator during its first two seasons three-season campaign. Multi-band (ugriz) light curves were measured for most sources, which include solar system objects, galactic variable stars, active nuclei, supernovae (SNe), and other astronomical transients. imaging survey is augmented by an extensive spectroscopic follow-up program to identify SNe, measure...
We present the results of one-year long observational campaign type II plateau SN 2005cs, which exploded in nearby spiral galaxy M51 (the Whirlpool galaxy). This extensive data set makes 2005cs best observed low-luminosity, 56Ni-poor event so far and one core-collapse supernovae ever. The optical near-infrared spectra show narrow P-Cygni lines characteristic this family, are indicative a very low expansion velocity (about 1000 km s−1) ejected material. light curves cover both phase late-time...
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...
Abstract We systematically surveyed period variations of superhumps in SU UMa-type dwarf novae based on newly obtained data and past publications. In many systems, the evolution superhump is found to be composed three distinct stages: an early evolutionary stage with a longer period, middle varying periods, final shorter, stable period. During stage, systems periods less than 0.08 d show positive derivatives. present observational characteristics these stages give greatly improved...
We present ugriz light curves for 146 spectroscopically-confirmed or spectroscopically-probable Type Ia supernovae (SNe) from the 2005 season of Sloan Digital Sky Survey-II Supernova (SN) survey. The have been constructed using a photometric technique that we call scene modeling, which is described in detail here; major feature SN brightnesses are extracted stack images without spatial resampling convolution image data. This procedure produces accurate photometry along with estimates...