Possible chromospheric activity cycles in II Peg, UX Ari and V711 TauWe study the Mount Wilson indices we obtained indirectly from IUE high and low resolution spectra of the RS CVn-type systems II Peg (K2IV), UX Ari (K0IV+G5V) and V711 Tau (K1IV+G5V), extensively…Andrea P. Buccino, Pablo J. D. Mauas·Oct 2, 2008SaveLearn
Dynamical and chemical effects of FR II radio sources on the intra-cluster mediumWe investigate the effects of intermittent strong jets from an Active Galactic Nuclei (AGN) of a massive galaxy in the core of a cool core galaxy cluster, on the dynamics and metal distribution of…Martin Huarte-Espinosa, Martin Krause, Paul Alexander et al.·Oct 2, 2008SaveLearn
Rising optical afterglows seen by TAROTWe present the multi-wavelength study of those gamma-ray bursts observed by TAROT. These events are characterized by the presence at early time of a rising in their optical light curves lasting a few…B. Gendre, A. Klotz, G. Stratta et al.·Oct 2, 2008SaveLearn
A planetary nebula around nova V458 Vul undergoing flash ionizationNova V458 Vul erupted on 2007 August 8th and reached a visual magnitude of 8.1 a few days later. Hα images obtained six weeks before the outburst as part of the IPHAS galactic plane survey reveal…R. Wesson, M. J. Barlow, R. L. M. Corradi et al.·Oct 2, 2008SaveLearn
Star formation in the central 0.5 pc of the Milky WayThe supermassive black hole candidate at the Galactic Center is surrounded by a parsec-scale star cluster, which contains a number of early type stars. The presence of such stars has been called a…Thibaut Paumard·Oct 2, 2008SaveLearn
Radio Astronomy Data Model for Single-Dish Multiple-Feed Telescopes, and Robledo Archive ArchitectureAll the effort that the astrophysical community has put into the development of the Virtual Observatory (VO) has surpassed the non-return point: the VO is a reality today, and an initiative that will…J. D. Santander-Vela, E. Garcia, J. F. Gomez et al.·Oct 2, 2008SaveLearn
Drastic changes in the molecular absorption at redshift z=0.89 toward the quasar PKS 1830-211A 12 year-long monitoring of the absorption caused by a z=0.89 spiral galaxy on the line of sight to the radio-loud gravitationally lensed quasar PKS 1830-211 reveals spectacular changes in the HCO+…Sebastien Muller, Michel Guelin·Oct 2, 2008SaveLearn
The luminosity of GRB afterglows as distance estimatorWe investigate the clustering of afterglow light curves observed at X-ray and optical wavelengths. We have constructed a sample of 61 bursts with known distance and X-ray afterglow. GRB sources can…B. Gendre, A. Galli, M. Boer·Oct 2, 2008SaveLearn
Orientations of very faint galaxies in the Coma clusterWe have then searched for preferential orientations of faint galaxies in the Coma cluster (down IVega~-11.5). By applying a deconvolution method to deep u* and I band images of the Coma cluster, we…C. Adami, R. Gavazzi, J. C. Cuillandre et al.·Oct 2, 2008SaveLearn
H2 Energetics in Galaxy-wide Shocks: Insights in Starburst Triggering and Galaxy FormationSpitzer space telescope observations led to the surprising detection of a diverse set of extragalactic sources whose infrared spectra are dominated by line emission of molecular hydrogen (H2). The…P. Guillard, F. Boulanger·Oct 2, 2008SaveLearn
Multi-Conjugate Adaptive Optics VLT imaging of the distant old open cluster FSR1415We employ the recently installed near infrared Multi-Conjugate Adaptive optics demonstrator (MAD) to determine basic properties of a newly identified, old and distant, Galactic open cluster…Y. Momany, S. Ortolani, C. Bonatto et al.·Oct 2, 2008SaveLearn
How to measure redshift-space distortions without sample varianceWe show how to use multiple tracers of large-scale density with different biases to measure the redshift-space distortion parameter beta=f/b=(dlnD/dlna)/b (where D is the growth rate and a the…Patrick McDonald, Uros Seljak·Oct 2, 2008SaveLearn
A high resolution view of the jet termination shock in a hot spot of the nearby radio galaxy Pictor A: implications for X-ray models of radio galaxy hot spotsImages made with the VLBA have resolved the region in a nearby radio galaxy, Pictor A, where the relativistic jet that originates at the nucleus terminates in an interaction with the intergalactic…S. J. Tingay, E. Lenc, G. Brunetti et al.·Oct 2, 2008SaveLearn
Iron Emission Lines on the Galactic Ridge Observed with SuzakuIn order to elucidate origin of the Galactic Ridge X-ray Emission, we analyzed Suzaku data taken at various regions along the Galactic plane and studied their Fe-K emission line features. Suzaku…Shigeo Yamauchi, Ken Ebisawa, Yasuo Tanaka et al.·Oct 2, 2008SaveLearn
Images IV: Strong evolution of the oxygen abundance in gaseous phases of intermediate mass galaxies since z=0.8Intermediate mass galaxies (logM(Msun)>10) at z~0.6 are the likeliest progenitors of the present-day numerous population of spirals. There is growing evidence that they have evolved rapidly since the…M. Rodrigues, F. Hammer, H. Flores et al.·Oct 2, 2008SaveLearn
High Redshift Galaxies in the Hubble Ultra Deep FieldMy dissertation presents results from three recent investigations in the Hubble Ultra Deep Field (HUDF) focusing on understanding structural and physical properties of high redshift galaxies. Here I…Nimish P. Hathi·Oct 2, 2008SaveLearn
VERITAS Observations of the Coma Cluster of GalaxiesClusters of galaxies are one of the few prominent classes of objects predicted to emit gamma rays not yet detected by satellites like EGRET or ground-based Imaging Atmospheric Cherenkov Telescopes…J. S. Perkins·Oct 1, 2008SaveLearn
VERITAS Observations of the BL Lac Object 1ES 1218+304The VERITAS collaboration reports the detection of very-high-energy (VHE) gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 1218+304 located at a redshift of z=0.182. A gamma-ray…Pascal Fortin·Oct 1, 2008SaveLearn
VERITAS Blazar Observations - Recent ResultsWe present the discovery of very high energy (VHE) gamma-ray emission from the high-frequency-peaked BL Lac object 1ES 0806+524 (z=0.138) and the intermediate-frequency-peaked BL Lac object W Comae…Peter Cogan·Oct 1, 2008SaveLearn
New Measurement of the Relative Scintillation Efficiency of Xenon Nuclear Recoils Below 10 keVLiquid xenon is an important detection medium in direct dark matter experiments, which search for low-energy nuclear recoils produced by the elastic scattering of WIMPs with quarks. The two existing…E. Aprile, L. Baudis, B. Choi et al.·Oct 1, 2008SaveLearn
The large-scale shock in the cluster of galaxies Hydra AWe analyzed a deep XMM-Newton observation of the cluster of galaxies Hydra A, focusing on the large-scale shock discovered as a surface brightness discontinuity in Chandra images. The shock front can…A. Simionescu, E. Roediger, P. E. J. Nulsen et al.·Oct 1, 2008SaveLearn
Evolution of the Dark Matter Phase-Space Density Distributions of LCDM HalosWe study the evolution of phase-space density during the hierarchical structure formation of LCDM halos. We compute both a spherically-averaged surrogate for phase-space density (Q) and the…Ileana Vass, Monica Valluri, Andrey Kravtsov et al.·Oct 1, 2008SaveLearn
Non-canonical generalizations of slow-roll inflation modelsWe consider non-canonical generalizations of two classes of simple single-field inflation models. First, we study the non-canonical version of "ultra-slow roll" inflation, which is a class of…Konstantinos Tzirakis, William H. Kinney·Oct 1, 2008SaveLearn
Independent confirmation and refined parameters of the hot Jupiter XO-5bWe present HATNet observations of XO-5b, confirming its planetary nature based on evidence beyond that described in the announcement of Burke et al. (2008), namely, the lack of significant…A. Pál, G. Á. Bakos, J. Fernandez et al.·Oct 1, 2008SaveLearn
A General Analysis of Non-Gaussianity from Isocurvature PerturbationsLight scalars may be ubiquitous in nature, and their quantum fluctuations can produce large non-Gaussianity in the cosmic microwave background temperature anisotropy. The non-Gaussianity may be…Masahiro Kawasaki, Kazunori Nakayama, Toyokazu Sekiguchi et al.·Oct 1, 2008SaveLearn