1.2k citations · 8.5k across the 143 of their papers we have counts for
10 papers · 1 filter
The Formation of Galaxies Hosting z~6 Quasars
Nishikanta Khandai, Yu Feng, Colin DeGraf +2
We investigate the formation and properties of galaxies hosting z~6 quasars, in the gigaparsec scale cosmological hydrodynamical simulation: MassiveBlack, which includes a self-con…
Hierarchical information clustering by means of topologically embedded graphs
Won-Min Song, T. Di Matteo, Tomaso Aste
We introduce a graph-theoretic approach to extract clusters and hierarchies in complex data-sets in an unsupervised and deterministic manner, without the use of any prior informati…
Dark matter halo occupation: environment and clustering
Rupert Croft, Tiziana Di Matteo, Nishikanta Khandai +3
We use a large dark matter simulation of a LambdaCDM model to investigate the clustering and environmental dependence of the number of substructures in a halo. Focusing on redshift…
Dynamical Hurst exponent as a tool to monitor unstable periods in financial time series
Raffaello Morales, T. Di Matteo, Ruggero Gramatica +1
We investigate the use of the Hurst exponent, dynamically computed over a moving time-window, to evaluate the level of stability/instability of financial firms. Financial firms bai…
Terapixel imaging of cosmological simulations
Yu Feng, Rupert A. C. Croft, Tiziana Di Matteo +8
The increasing size of cosmological simulations has led to the need for new visualization techniques. We focus on Smoothed Particle Hydrodynamical (SPH) simulations run with the GA…
Early Black Holes in Cosmological Simulations: Luminosity Functions and Clustering Behaviour
Colin DeGraf, Tiziana Di Matteo, Nishikanta Khandai +3
We examine predictions for the quasar luminosity functions (QLF) and quasar clustering at high redshift (z > 4.75) using MassiveBlack, our new hydrodynamic cosmological simulation…
Cold flows and the first quasars
Tiziana Di Matteo, Nishikanta Khandai, Colin DeGraf +4
Observations of the most distant bright quasars imply that billion solar mass supermassive black holes (SMBH) have to be assembled within the first eight hundred million years. Und…
Exploring complex networks via topological embedding on surfaces
Tomaso Aste, Ruggero Gramatica, T. Di Matteo
We demonstrate that graphs embedded on surfaces are a powerful and practical tool to generate, characterize and simulate networks with a broad range of properties. Remarkably, the…
The Halo Occupation Distribution of Active Galactic Nuclei
Suchetana Chatterjee, Colin DeGraf, Jonathan Richardson +3
Using a fully cosmological hydrodynamic simulation that self-consistently incorporates the growth and feedback of supermassive black holes and the physics of galaxy formation, we e…
The Halo Occupation Distribution of Black Holes: Dependence on Mass
Colin DeGraf, Matthew Oborski, Tiziana Di Matteo +4
We investigate the halo occupation distribution (HOD) of black holes within a hydrodynamic cosmological simulation that directly follows black hole growth. Similar to the HOD of ga…