924 citations · 5.5k across the 78 of their papers we have counts for
44 papers · 1 filter
Revealing components of the galaxy population through nonparametric techniques
Steven P. Bamford, Alex L. Rojas, Robert C. Nichol +4
The distributions of galaxy properties vary with environment, and are often multimodal, suggesting that the galaxy population may be a combination of multiple components. The behav…
Inference for the dark energy equation of state using Type IA supernova data
Christopher Genovese, Peter Freeman, Larry Wasserman +2
The surprising discovery of an accelerating universe led cosmologists to posit the existence of "dark energy"--a mysterious energy field that permeates the universe. Understanding…
Galaxy Zoo: the dependence of morphology and colour on environment
Steven P. Bamford, Robert C. Nichol, Ivan K. Baldry +13
We analyse the relationships between galaxy morphology, colour, environment and stellar mass using data for over 100,000 objects from Galaxy Zoo, the largest sample of visually cla…
X-ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups
Alexey Voevodkin, Christopher J. Miller, Konstantin Borozdin +4
We present a combined optical and X-ray analysis of three optically selected X-ray bright groups with giant elliptical galaxies in the center. These massive ellipticals were target…
Mass and Redshift Dependence of Star Formation in Relaxed Galaxy Clusters
Rose A. Finn, Michael L. Balogh, Dennis Zaritsky +2
We investigate the star-formation properties of dynamically relaxed galaxy clusters as a function of cluster mass for 308 low-redshift clusters drawn from the Sloan Digital Sky Sur…
The XMM Cluster Survey: Forecasting cosmological and cluster scaling-relation parameter constraints
Martin Sahlén, Pedro T. P. Viana, Andrew R. Liddle +16
We forecast the constraints on the values of sigma_8, Omega_m, and cluster scaling relation parameters which we expect to obtain from the XMM Cluster Survey (XCS). We assume a flat…
Mapping the Cosmological Confidence Ball Surface
Brent Bryan, Jeff Schneider, Christopher J. Miller +3
We present a new technique to compute simultaneously valid confidence intervals for a set of model parameters. We apply our method to the Wilkinson Microwave Anisotropy Probe's (WM…
The XMM Cluster Survey: A Massive Galaxy Cluster at z=1.45
S. A. Stanford, A. K. Romer, K. Sabirli +14
We report the discovery of XMMXCS J2215.9-1738, a massive galaxy cluster at z =1.45, which was found in the XMM Cluster Survey. The cluster candidate was initially identified as an…
The Effect of Large-Scale Structure on the SDSS Galaxy Three-Point Correlation Function
R. C. Nichol, R. K. Sheth, Y. Suto +21
We present measurements of the normalised redshift-space three-point correlation function (Q_z) of galaxies from the Sloan Digital Sky Survey (SDSS) main galaxy sample. We have app…
Percolation Galaxy Groups and Clusters in the SDSS Redshift Survey: Identification, Catalogs, and the Multiplicity Function
Andreas A. Berlind, Joshua A. Frieman, David H. Weinberg +17
We identify galaxy groups and clusters in volume-limited samples of the SDSS redshift survey, using a redshift-space friends-of-friends algorithm. We optimize the friends-of-friend…
Statistical Computations with AstroGrid and the Grid
Robert C Nichol, Garry Smith, Christopher J Miller +6
We outline our first steps towards marrying two new and emerging technologies; the Virtual Observatory (e.g, AstroGrid) and the computational grid. We discuss the construction of V…
Massive Science with VO and Grids
Robert Nichol, Garry Smith, Christopher Miller +7
There is a growing need for massive computational resources for the analysis of new astronomical datasets. To tackle this problem, we present here our first steps towards marrying…
Examining the Effect of the Map-Making Algorithm on Observed Power Asymmetry in WMAP Data
P. E. Freeman, C. R. Genovese, C. J. Miller +2
We analyze first-year data of WMAP to determine the significance of asymmetry in summed power between arbitrarily defined opposite hemispheres, using maps that we create ourselves…
Cluster Merger Variance and the Luminosity Gap Statistic
Milos Milosavljevic, Christopher J. Miller, Steven R. Furlanetto +1
The presence of multiple luminous galaxies in clusters can be explained by the finite time over which a galaxy sinks to the center of the cluster and merges with the the central ga…
Emission-line spectroscopy of Damped Lyman Alpha Systems: The case of SBS 1543+593/HS 1543+5921
Regina E. Schulte-Ladbeck, Brigitte K"onig, Christopher J. Miller +4
We report HST/STIS spectroscopy and Gemini/GMOS-N imaging of the Damped Lyman Alpha (DLA) system toward HS 1543+5921 caused by the host star-forming galaxy (SFG) SBS 1543+593. The…
The C4 Clustering Algorithm: Clusters of Galaxies in the Sloan Digital Sky Survey
Christopher J. Miller, Robert Nichol, Dan Reichart +15
We present the "C4 Cluster Catalog", a new sample of 748 clusters of galaxies identified in the spectroscopic sample of the Second Data Release (DR2) of the Sloan Digital Sky Surve…
Near-infrared imaging of 222 nearby Hdelta-strong galaxies from the SDSS
Michael L. Balogh, Chris Miller, Robert Nichol +2
We present UFTI K-band imaging observations of 222 galaxies that are selected from the Sloan Digital Sky Survey to have unusually strong Hdelta absorption equivalent widths, W(Hd)>…
Nonparametric Inference for the Cosmic Microwave Background
Christopher R. Genovese, Christopher J. Miller, Robert C. Nichol +2
The Cosmic Microwave Background (CMB), which permeates the entire Universe, is the radiation left over from just 380,000 years after the Big Bang. On very large scales, the CMB rad…
The Clustering of AGN in the Sloan Digital Sky Survey
David A. Wake, Christopher J. Miller, Tiziana Di Matteo +6
We present the two--point correlation function (2PCF) of narrow-line active galactic nuclei (AGN) selected within the First Data Release of the Sloan Digital Sky Survey. Using a sa…
The bimodal galaxy color distribution: dependence on luminosity and environment
Michael L. Balogh, Ivan K. Baldry, Robert Nichol +3
We analyse the u-r color distribution of 24346 galaxies with Mr<=-18 and z<0.08, drawn from the Sloan Digital Sky Survey first data release, as a function of luminosity and environ…
Star-Forming Galaxies in the Sloan Digital Sky Survey -- The View from Pittsburgh
Regina E. Schulte-Ladbeck, Christopher J. Miller, Ulrich Hopp +4
We used data from the Data Release 1 (DR1) of the Sloan Digital Sky Survey (SDSS) in order to define a catalog of about 13,000 star-forming galaxies (SFG). We discuss the results o…
The Environment of AGNs in the Sloan Digital Sky Survey
Christopher J. Miller, Robert C. Nichol, Percy Gomez +2
We present the observed fraction of galaxies with an Active Galactic Nucleus (AGN) as a function of environment in the Early Data Release of the Sloan Digital Sky Survey (SDSS). Us…
Limits on thermal conduction in galaxy clusters
Mikhail V. Medvedev, Adrian L. Melott, Chris Miller +1
We have calculated lower limits for the global effective thermal conductivity in a sample of 165 Abell clusters. We assumed that cluster X-ray luminosity is compensated by a conduc…
The Interplay of Cluster and Galaxy Evolution
Robert C. Nichol, Christopher J. Miller, Tomotsugu Goto
We review here the interplay of cluster and galaxy evolution. As a case study, we consider the Butcher-Oemler effect and propose that it is the result of the changing rate of clust…