A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic NucleiWe present a new semi-analytic model that self-consistently traces the growth of supermassive black holes (BH) and their host galaxies within the context of the LCDM cosmological framework. In our…Rachel S. Somerville, Philip F. Hopkins, Thomas J. Cox et al.·Aug 8, 2008SaveLearn
Resonant Excitation of Disk Oscillations in Deformed Disks III: Revision of Mathematical TreatmentIn previous studies, we have examined a resonant excitation of disk oscillations in deformed disks. In these studies, however, mathematical treatment around the resonant points was not rigorous. In…Shoji Kato·Aug 8, 2008SaveLearn
Coupling MOAO with Integral Field Spectroscopy: specifications for the VLT and the E-ELT[Abridged] We have developed an end-to-end simulation to specify the science requirements of a MOAO-fed integral field spectrograph on either an 8m or 42m telescope. Our simulations re-scales…M. Puech, H. Flores, M. Lehnert et al.·Aug 8, 2008SaveLearn
Molecular Gas in NUclei of GAlaxies (NUGA). X. The Seyfert 2 galaxy NGC 3147We present CO(1-0) and CO(2-1) observations of the SA(rs)bc Seyfert 2 galaxy NGC 3147, obtained with the IRAM interferometer at 19 ×16 and 16 ×14 resolutions,…V. Casasola, F. Combes, S. Garcia-Burillo et al.·Aug 8, 2008SaveLearn
The GRB-Supernova ConnectionLong-duration gamma-ray bursts (GRBs) are believed to be produced by the core collapse of massive stars and hence to be connected with supernovae (SNe). Indeed, for four pairs of GRBs and SNe,…Li-Xin Li·Aug 8, 2008SaveLearn
SMC in space and time: a project to study the evolution of the prototype interacting late-type dwarf galaxyWe introduce the SMC in space and time, a large coordinated space and ground-based program to study star formation processes and history, as well as variable stars, structure, kinematics and chemical…M. Tosi, J. Gallagher, E. Sabbi et al.·Aug 8, 2008SaveLearn
A Pilot Survey of HI in Field Galaxies at Redshift z~0.2We present the first results of a targeted survey carried out with the 305 m Arecibo telescope to detect HI-line emission from galaxies at redshift z>0.16. The targets, selected from the Sloan…Barbara Catinella, Martha P. Haynes, Riccardo Giovanelli et al.·Aug 8, 2008SaveLearn
GRB 060206: hints of precession of the central engine?Aims. The high-redshift (z = 4:048) gamma-ray burst GRB 060206 showed unusual behavior, with a significant rebrightening by a factor of ~ 4 at about 3000 s after the burst. We argue that this…X. W. Liu, X. F. Wu, T. Lu·Aug 8, 2008SaveLearn
VLBI Astrometry of AGB Variables with VERA -- A Semiregular Variable S Crateris --We present a distance measurement for the semiregular variable S Crateris (S Crt) based on its annual parallax. With the unique dual beam system of the VLBI Exploration for Radio Astrometry (VERA)…Akiharu Nakagawa, Miyuki Tsushima, Kazuma Ando et al.·Aug 8, 2008SaveLearn
Response to the Mouschovias-Tassis Comments on "Testing Magnetic Star Formation Theory"In this note we respond to Mouschovias and Kassis criticisms that our paper "Testing Magnetic Star Formation Theory" is flawed. We stand fully behind our paper.Richard M. Crutcher, Nicholas Hakobian, Thomas H. Troland·Aug 8, 2008SaveLearn
Bulk viscosity and r-modes of neutron starsThe bulk viscosity due to the non-leptonic process involving hyperons in K- condensed matter is discussed here. We find that the bulk viscosity is modified in a superconducting phase. Further, we…Debarati Chatterjee, Debades Bandyopadhyay·Aug 8, 2008SaveLearn
The Micro-Arcsecond Scintillation-Induced Variability (MASIV) Survey II: The First Four EpochsWe report on the variability of 443 flat spectrum, compact radio sources monitored using the VLA for 3 days in 4 epochs at ~ 4 month intervals at 5 GHz as part of the Micro-Arcsecond…J. E. J. Lovell, B. J. Rickett, J-P. Macquart et al.·Aug 8, 2008SaveLearn
Rotation and Turbulence of the Hot ICM in Galaxy ClustersCosmological simulations of galaxy clusters typically find that the weight of a cluster at a given radius is not balanced entirely by the thermal gas pressure of the hot ICM, with theoretical studies…Taotao Fang, Philip J. Humphrey, David A. Buote·Aug 8, 2008SaveLearn
Large-scale dynamos at low magnetic Prandtl numbersUsing direct simulations of hydromagnetic turbulence driven by random polarized waves it is shown that dynamo action is possible over a wide range of magnetic Prandtl numbers from 10-3 to 1. Triply…Axel Brandenburg·Aug 7, 2008SaveLearn
Luminosity distance in "Swiss cheese" cosmology with randomized voids: I. Single void sizeRecently there have been suggestions that the Type Ia supernova data can be explained using only general relativity and cold dark matter with no dark energy. In "Swiss cheese" models of the…R. Ali Vanderveld, Eanna E. Flanagan, Ira Wasserman·Aug 7, 2008SaveLearn
Classification of Swift's gamma-ray burstsTwo classes of gamma-ray bursts have been identified in the BATSE catalogs characterized by durations shorter and longer than about 2 seconds. There are, however, some indications for the existence…I. Horvath, L. G. Balazs, Z. Bagoly et al.·Aug 7, 2008SaveLearn
Backreaction of superhorizon perturbations in scalar field cosmologiesIt has been suggested that the acceleration of the Universe may be due to the backreaction of perturbations to the Friedmann-Robertson-Walker background. For a Universe dominated by cold dark matter,…Naresh Kumar, Eanna E. Flanagan·Aug 7, 2008SaveLearn
Clump morphology and evolution in MHD simulations of molecular cloud formationAbridged: We study the properties of clumps formed in three-dimensional weakly magnetized magneto-hydrodynamic simulations of converging flows in the thermally bistable, warm neutral medium (WNM). We…Robi Banerjee, Enrique Vazquez-Semadeni, Patrick Hennebelle et al.·Aug 7, 2008SaveLearn
A minimal set of invariants as a systematic approach to higher order gravity modelsHigher-order gravity models have been recently the subject of much attention in the context of cosmic acceleration. These models are derived by adding various curvature invariants to the…Mustapha Ishak, Jacob Moldenhauer·Aug 7, 2008SaveLearn
A Line-Of-Sight Galaxy Cluster Collision: Simulated X-Ray ObservationsSeveral lines of evidence have suggested that the the galaxy cluster Cl~0024+17, an apparently relaxed system, is actually a collision of two clusters, the interaction occurring along our line of…J. A. Zuhone, P. M. Ricker, D. Q. Lamb et al.·Aug 7, 2008SaveLearn
When Clusters Collide: Constraints On Antimatter On The Largest ScalesObservations have ruled out the presence of significant amounts of antimatter in the Universe on scales ranging from the solar system, to the Galaxy, to groups and clusters of galaxies, and even to…Gary Steigman·Aug 7, 2008SaveLearn
Total mass biases in X-ray galaxy clustersThe exploitation of clusters of galaxies as cosmological probes relies on accurate measurements of their total gravitating mass. X-ray observations provide a powerful means of probing the total mass…Rocco Piffaretti, Riccardo Valdarnini·Aug 7, 2008SaveLearn
Simulating High-Redshift Disk Galaxies: Applications to Long Duration Gamma-Ray Burst HostsThe efficiency of star formation governs many observable properties of the cosmological galaxy population, yet many current models of galaxy formation largely ignore the important physics of star…Brant E. Robertson·Aug 7, 2008SaveLearn
Constraining Interactions in Cosmology's Dark SectorWe consider the cosmological constraints on theories in which there exists a nontrivial coupling between the dark matter sector and the sector responsible for the acceleration of the universe, in…Rachel Bean, Eanna E. Flanagan, Istvan Laszlo et al.·Aug 7, 2008SaveLearn
High-Redshift Galaxy Kinematics: Constraints on Models of Disk FormationIntegral field spectroscopy of galaxies at redshift z~2 has revealed a population of early-forming, rotationally-supported disks. These high-redshift systems provide a potentially important clue to…Brant E. Robertson, James S. Bullock·Aug 7, 2008SaveLearn