A new modified-rate approach for gas-grain chemical simulationsUnderstanding grain-surface processes is crucial to interpreting the chemistry of the ISM. However, accurate surface chemistry models are computationally expensive and are difficult to integrate with…R. T. Garrod·Sep 17, 2008SaveLearn
Polarimetry with a soft x-ray spectrometerAn approach for measuring linear X-ray polarization over a broad-band using conventional spectroscopic optics is described. A set of multilayer-coated flats reflect the dispersed X-rays to the…Herman L. Marshall·Sep 17, 2008SaveLearn
Star cluster survival and compressive tides in Antennae-like mergersGravitational tides are widely understood to strip and destroy galactic substructures. In the course of a galaxy merger, however, transient totally compressive tides may develop and prevent star…F. Renaud, C. M. Boily, J. -J. Fleck et al.·Sep 17, 2008SaveLearn
Foreground removal from CMB temperature maps using an MLP neural networkOne of the main obstacles in extracting the Cosmic Microwave Background (CMB) signal from observations in the mm-submm range is the foreground contamination by emission from galactic components:…H. U. Norgaard-Nielsen, H. E. Jorgensen·Sep 17, 2008SaveLearn
Cosmological Structure Formation under MOND: a new numerical solver for Poisson's equationWe present a novel solver for an analogue to Poisson's equation in the framework of modified Newtonian dynamics (MOND). This equation is highly non-linear and hence standard codes based upon tree…Claudio Llinares, Alexander Knebe, HongSheng Zhao·Sep 17, 2008SaveLearn
Complexity and white-dwarf structureFrom the low-mass non-relativistic case to the relativistic limit, the density profile of a white dwarf is used to evaluate the complexity measure. Similarly to the recently reported atomic case…J. Sanudo, A. F. Pacheco·Sep 17, 2008SaveLearn
Comparison of coronagraphs for high contrast imaging in the context of Extremely Large TelescopesWe compare coronagraph concepts and investigate their behavior and suitability for planet finder projects with Extremely Large Telescopes (ELTs, 30-42 meters class telescopes). For this task, we…P. Martinez, A. Boccaletti, M. Kasper et al.·Sep 17, 2008SaveLearn
Planet Migration through a Self-Gravitating Planetesimal DiskWe simulate planet migration caused by interactions between planets and a planetesimal disk. We use an N-body integrator optimized for near-Keplerian motion that runs in parallel on a video graphics…Alexander J. Moore, Alice C. Quillen, Richard G. Edgar·Sep 17, 2008SaveLearn
An AKARI Search for Intracluster Dust of Globular ClustersWe report the observations of 12 globular clusters with the AKARI/FIS. Our goal is to search for emission from the cold dust within clusters. We detect diffuse emissions toward NGC 6402 and 2808, but…N. Matsunaga, H. Mito, Y. Nakada et al.·Sep 17, 2008SaveLearn
Weighing the spatial and temporal fluctuations of the dark universeA generic prediction of the standard cosmology, based on general relativity (GR), dark matter and the cosmological constant (and more generally, smooth dark energy), is that, the two gravitational…Pengjie Zhang, Rachel Bean, Michele Liguori et al.·Sep 17, 2008SaveLearn
Origin of the X-ray Emission in the Nuclei of FR IsWe investigate the X-ray origin in FRIs using the multi-waveband high resolution data of eight FR I sources, which have very low Eddington ratios. We fit their multi-waveband spectrum using a coupled…Qingwen Wu, Feng Yuan, Xinwu Cao·Sep 17, 2008SaveLearn
The Redshift Evolution of the Tully-Fisher Relation as a Test of Modified GravityThe redshift evolution of the Tully-Fisher Relation probes gravitational dynamics that must be consistent with any modified gravity theory seeking to explain the galactic rotation curves without the…Christopher Limbach, Dimitrios Psaltis, Feryal Ozel·Sep 17, 2008SaveLearn
High mass-to-light ratios of UCDs - Evidence for dark matter ?Ultra-compact dwarf galaxies (UCDs) are stellar systems with masses of around 107 to 108 Msun and half mass radii of 10-100 pc. They have some properties in common with massive globular clusters,…Holger Baumgardt, Steffen Mieske·Sep 17, 2008SaveLearn
Instability of anisotropic cosmological solutions supported by vector fieldsModels with vector fields acquiring a non-vanishing vacuum expectation value along one spatial direction have been proposed to sustain a prolonged stage of anisotropic accelerated expansion. Such…Burak Himmetoglu, Carlo R. Contaldi, Marco Peloso·Sep 17, 2008SaveLearn
The abundance of lensing protoclustersWeak gravitational lensing provides a potentially powerful method for the detection of clusters. In addition to cluster candidates, a large number of objects with possibly no optical or X-ray…Anson D'Aloisio, Steven R. Furlanetto, Priyamvada Natarajan·Sep 16, 2008SaveLearn
Revisiting the effect of H2, HD and LiH molecules in the cooling of primordial gasWe use a non-equilibrium chemical network to revisit and study the effect of H2, HD and LiH molecular cooling on a primordial element of gas. We solve both the thermal and chemical equations for a…Joaquin P. Prieto, Leopoldo Infante, Raul Jimenez·Sep 16, 2008SaveLearn
FUSE spectroscopy of sdOB primary of the post common-envelope binary LB 3459 (AA Dor)LB 3459 (AA Dor) is an eclipsing, close, post common-envelope binary consisting of an sdOB primary star and an unseen secondary with an extraordinarly low mass - formally a brown dwarf. A recent NLTE…Johannes Fleig, Thomas Rauch, Klaus Werner et al.·Sep 16, 2008SaveLearn
An analysis of the possible thermal emission at radio frequencies from an evolved supernova remnant HB 3 (G132.7 + 1.3): revisitedIt has recently been reported that some of the flux density values for an evolved supernova remnant (SNR) HB 3 (G132.7 + 1.3) are not accurate. In this work we revised an analysis of the possible…D. Onić, D. Urošević·Sep 16, 2008SaveLearn
Abundances in Metal-Poor Stars and Chemical Evolution of the Early GalaxyWe have attributed the elements from Sr through Ag in stars of low metallicities ([Fe/H] < -1.5) to charged-particle reactions (CPR) in neutrino-driven winds, which are associated with neutron star…G. J. Wasserburg, Y. -Z. Qian·Sep 16, 2008SaveLearn
Recent Progress in the Understanding of the r-ProcessA brief overview of the r-process is given with an emphasis on the observational implications for this process. The conditions required for the major production of the heavy r-process elements…Yong-Zhong Qian·Sep 16, 2008SaveLearn
Direct evidence of a sub-stellar companion around CT ChaIn our ongoing search for close and faint companions around T Tauri stars, we found a very faint (Ks=14.9mag, Ks0=14.4mag) object, just ~2.67" northwest of the Chamaeleon star-forming region…T. O. B. Schmidt, R. Neuhäuser, A. Seifahrt et al.·Sep 16, 2008SaveLearn
Eleven years of radio monitoring of the Type IIn supernova SN 1995NWe present radio observations of the optically bright Type IIn supernova SN 1995N. We observed the SN at radio wavelengths with the Very Large Array (VLA) for 11 years. We also observed it at low…Poonam Chandra, Christopher J. Stockdale, Roger A. Chevalier et al.·Sep 16, 2008SaveLearn
The Effect of Gas Physics on the Halo Mass FunctionCosmological tests based on cluster counts require accurate calibration of the space density of massive halos, but most calibrations to date have ignored complex gas physics associated with halo…R. Stanek, D. Rudd, A. E. Evrard·Sep 16, 2008SaveLearn
Survey of ortho-H2D+(11,0-11,1) in dense cloud coresWe present a survey of the ortho-H2D+(11,0-11,1) line toward a sample of 10 starless cores and 6 protostellar cores, carried out at the Caltech Submillimeter Observatory. The high diagnostic…Paola Caselli, Charlotte Vastel, Cecilia Ceccarelli et al.·Sep 16, 2008SaveLearn
Revealing components of the galaxy population through nonparametric techniquesThe distributions of galaxy properties vary with environment, and are often multimodal, suggesting that the galaxy population may be a combination of multiple components. The behaviour of these…Steven P. Bamford, Alex L. Rojas, Robert C. Nichol et al.·Sep 16, 2008SaveLearn