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UGC 7069: The largest ring galaxy
Kajal K. Ghosh, Michela Mapelli
We find that UGC 7069 is the largest ring galaxy known to date. In this Letter, we present a multiwavelength study of this galaxy (combining radio, 2MASS, optical and ultraviolet d…
Radiation from early black holes - I: effects on the neutral inter-galactic medium
E. Ripamonti, M. Mapelli, S. Zaroubi
In the pre-reionization Universe, the regions of the inter-galactic medium (IGM) which are far from luminous sources are the last to undergo reionization. Until then, they should b…
Character and detectability of the dark ages and the epoch of reionization: the view from the simulations
Ilian T. Iliev, Garrelt Mellema, Ue-Li Pen +1
Direct detection of the Dark Ages and the Epoch of Reionization (EOR) is among the main scientific objectives of all current and future low-frequency radio facilities. In this pape…
The Arecibo Legacy Fast ALFA Survey: V. HI Source Catalog of the Anti-Virgo Region at dec=27 degrees
Amelie Saintonge, Riccardo Giovanelli, Martha P. Haynes +5
We present a second catalog of HI sources detected in the Arecibo Legacy Fast ALFA Survey. We report 488 detections over 135 square degrees, within the region of the sky having 22h…
The formation of ultra-compact dwarf galaxies and nucleated dwarf galaxies
Tobias Goerdt, Ben Moore, Stelios Kazantzidis +3
Ultra compact dwarf galaxies (UCDs) have similar properties as massive globular clusters or the nuclei of nucleated galaxies. Recent observations suggesting a high dark matter cont…
A Simple Analytical Formulation for Periodic Orbits in Binary Stars
Erick Nagel, Barbara Pichardo
An analytical approximation to periodic orbits in the circular restricted three-body problem is provided. The formulation given in this work is based in calculations known from cla…
Rapid Formation of Supermassive Black Hole Binaries in Galaxy Mergers with Gas
Lucio Mayer, Stelios Kazantzidis, Piero Madau +3
Supermassive black holes (SMBHs) are a ubiquitous component of the nuclei of galaxies. It is normally assumed that, following the merger of two massive galaxies, a SMBH binary will…
The survival and disruption of CDM micro-haloes: implications for direct and indirect detection experiments
Tobias Goerdt, Oleg Y. Gnedin, Ben Moore +2
If the dark matter particle is a neutralino then the first structures to form are cuspy cold dark matter (CDM) haloes collapsing after redshifts z ~ 100 in the mass range 10^{-6} -…
Microlensing towards LMC: a study of the LMC halo contribution
S. Calchi Novati, F. De Luca, Ph. Jetzer +1
We carry on a new analysis of the sample of MACHO microlensing candidates towards the LMC. Our main purpose is to determine the lens population to which the events may belong. We g…
Does the Fornax dwarf spheroidal have a central cusp or core?
Tobias Goerdt, Ben Moore, J. I. Read +2
The dark matter dominated Fornax dwarf spheroidal has five globular clusters orbiting at ~1 kpc from its centre. In a cuspy CDM halo the globulars would sink to the centre from the…
Angular momentum transport and disk morphology in SPH simulations of galaxy formation
Tobias Kaufmann, Lucio Mayer, James Wadsley +2
We perform controlled N-Body/SPH simulations of disk galaxy formation by cooling a rotating gaseous mass distribution inside equilibrium cuspy spherical and triaxial dark matter ha…
Cooling flows within galactic haloes: the kinematics and properties of infalling multi-phase gas
Tobias Kaufmann, Lucio Mayer, James Wadsley +2
We study the formation of disks via the cooling flow of gas within galactic haloes using smoothed particle hydrodynamics simulations. These simulations resolve mass scales of a few…
The distribution and kinematics of early high-sigma peaks in present-day haloes: implications for rare objects and old stellar populations
Juerg Diemand, Piero Madau, Ben Moore
We show that the hierarchical assembly of cold dark matter (CDM) haloes preserves the memory of the initial conditions. Using N-body cosmological simulations, we demonstrate that t…
Cusps in CDM halos
Juerg Diemand, Marcel Zemp, Ben Moore +2
We resolve the inner region of a massive cluster forming in a cosmological LCDM simulation with a mass resolution of 2*10^6 Msun and before z=4.4 even 3*10^5 Msun. This is a billio…
Disk Galaxy Rotation Curves in Triaxial CDM Halos
E. Hayashi, J. F. Navarro, A. Jenkins +7
We use N-body hydrodynamical simulations to study the structure of disks in triaxial potentials resembling CDM halos. Our analysis focuses on the accuracy of the dark mass distribu…
The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
Julio F. Navarro, Eric Hayashi, Chris Power +6
We investigate the mass profile of LambdaCDM halos using a suite of numerical simulations spanning five decades in halo mass, from dwarf galaxies to rich galaxy clusters. Our analy…
The Inner Structure of LCDM Halos II: Halo Mass Profiles and LSB Rotation Curves
E. Hayashi, J. F. Navarro, C. Power +6
We use a set of high-resolution cosmological N-body simulations to investigate the inner mass profile of galaxy-sized cold dark matter (CDM) halos. These simulations extend the tho…
Aspherical galaxy clusters: effects on cluster masses and gas mass fractions
Rocco Piffaretti, Philippe Jetzer, Sabine Schindler
We present an investigation of the effects of asphericity on the estimates of total mass and gas mass fraction in galaxy clusters from X-ray observations. We model the aspherical s…