Publications (17)
The weak dependence of velocity dispersion on disk fractions, mass-to-light ratio and redshift: Implications for galaxy and black hole evolution
Christopher Marsden, Francesco Shankar, Mariangela Bernardi +3
Velocity dispersion () is a key driver for galaxy structure and evolution. We here present a comprehensive semi-empirical approach to compute via detailed Jeans modelling…
A Hierarchy of Voids
Rien van de Weygaert, Ravi Sheth, Erwin Platen
We present a model for the distribution of void sizes and its evolution within the context of hierarchical scenarios of gravitational structure formation. For a proper description…
Galaxy Star-Formation as a Function of Environment in the Early Data Release of the Sloan Digital Sky Survey
Percy Gomez, Robert Nichol, Chris Miller +14
(Abridged) We present in this paper a detailed analysis of the effect of environment on the star-formation activity of galaxies within the EDR of the SDSS. We have used the Halpha…
Mass growth and density profiles of dark matter halos in hierarchical clustering
Adi Nusser, Ravi Sheth
We develop a model for the growth of dark matter halos and use it to study their evolved density profiles. In this model, halos are spherical and form by quiescent accretion of mat…
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…
Environmental dependence of bulge-dominated galaxy sizes in hierarchical models of galaxy formation. Comparison with the local Universe
Francesco Shankar, Simona Mei, Marc Huertas-Company +9
We compare state-of-the-art semi-analytic models of galaxy formation as well as advanced sub-halo abundance matching models with a large sample of early-type galaxies from SDSS at…
Halo Dark Matter and Ultra-High Energy Cosmic Rays
Pasquale Blasi, Ravi Sheth
The decay of very heavy metastable relics of the Early Universe can produce ultra-high energy cosmic rays (UHECRs) in the halo of our own Galaxy. On distance scales of the order of…
Void Hierarchy and Cosmic Structure
Rien van de Weygaert, Ravi Sheth
Within the context of hierarchical scenarios of gravitational structure formation we describe how an evolving hierarchy of voids evolves on the basis of {\em two} processes, the {\…
Halo Models of Large Scale Structure
Asantha Cooray, Ravi Sheth
We review the formalism and applications of the halo-based description of nonlinear gravitational clustering. In this approach, all mass is associated with virialized dark matter h…
Avoiding progenitor bias: The structural and mass evolution of Brightest Group and Cluster Galaxies in Hierarchical models since z~1
Francesco Shankar, Stewart Buchan, Alessandro Rettura +10
The mass and structural evolution of massive galaxies is one of the hottest topics in galaxy formation. This is because it may reveal invaluable insights into the still debated evo…
On the intermediate-redshift central stellar mass-halo mass relation, and implications for the evolution of the most massive galaxies since z~1
Francesco Shankar, Hong Guo, Vincent Bouillot +20
The stellar mass-halo mass relation is a key constraint in all semi-analytic, numerical, and semi-empirical models of galaxy formation and evolution. However, its exact shape and r…
MgII absorption systems and their neighbouring galaxies from a background subtraction technique
Michelle Caler, Ravi Sheth, Bhuvnesh Jain
We estimate the absolute magnitude distribution of galaxies which lie within about a Mpc of Mg II absorption systems. The absorption systems themselves lie along 1880 lines of sigh…
Large Scale Clustering of Sloan Digital Sky Survey Quasars: Impact of the Baryon Density and the Cosmological Constant
Kazuhiro Yahata, Yasushi Suto, Issha Kayo +13
We report the first result of the clustering analysis of Sloan Digital Sky Survey (SDSS) quasars. We compute the two-point correlation function (2PCF) of SDSS quasars in redshift s…
Three-point Correlation Functions of SDSS Galaxies in Redshift Space: Morphology, Color, and Luminosity Dependence
Issha Kayo, Yasushi Suto, Robert C. Nichol +10
We present measurements of the redshift--space three-point correlation function of galaxies in the Sloan Digital Sky Survey (SDSS). For the first time, we analyze the dependence of…
Cosmic Tides
Ue-Li Pen, Ravi Sheth, J. Harnois-Deraps +2
We apply CMB lensing techniques to large scale structure and solve for the 3-D cosmic tidal field. We use small scale filamentary structures to solve for the large scale tidal shea…
An excursion set model of the cosmic web: The abundance of sheets, filaments and halos
Jiajian Shen, Tom Abel, H. J. Mo +1
We discuss an analytic approach for modeling structure formation in sheets, filaments and knots. This is accomplished by combining models of triaxial collapse with the excursion se…
Experimental design and model selection: The example of exoplanet detection
Vijay Balasubramanian, Klaus Larjo, Ravi Sheth
We apply the Minimum Description Length model selection approach to the detection of extra-solar planets, and use this example to show how specification of the experimental design…