An Improved Cluster Richness EstimatorMinimizing the scatter between cluster mass and accessible observables is an important goal for cluster cosmology. In this work, we introduce a new matched filter richness estimator, and test its…Eduardo Rozo, Eli S. Rykoff, Benjamin P. Koester et al.·Sep 16, 2008SaveLearn
Mapping dusty star formation in and around a cluster at z=0.81 by wide-field imaging with AKARIWe present environmental dependence of dusty star forming activity in and around the cluster RXJ1716.4+6708 at z=0.81 based on wide-field and multi-wavelength observations with Suprime-Cam on the…Yusei Koyama, Tadayuki Kodama, Kazuhiro Shimasaku et al.·Sep 16, 2008SaveLearn
Constraining the Scatter in the Mass-Richness Relation of maxBCG Clusters With Weak Lensing and X-ray DataWe measure the logarithmic scatter in mass at fixed richness for clusters in the maxBCG cluster catalog, an optically selected cluster sample drawn from SDSS imaging data. Our measurement is achieved…Eduardo Rozo, Eli S. Rykoff, August Evrard et al.·Sep 16, 2008SaveLearn
On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation. II. The Effect of MetallicityIt has been observed that Cepheids in the Magellanic Clouds have lower masses for the same luminosity than those in the Milky Way. The model, from Neilson & Lester (2008), of pulsation-driven mass…Hilding R. Neilson, John B. Lester·Sep 16, 2008SaveLearn
Disk Evolution and Bar Triggering Driven by Interactions with Dark Matter SubstructureWe study formation and evolution of bar-disk systems in fully self-consistent cosmological simulations of galaxy formation in the LCDM WMAP3 Universe. In a representative model we find that the first…Emilio Romano-Diaz, Isaac Shlosman, Clayton Heller et al.·Sep 16, 2008SaveLearn
Puzzling X-rays from the new colliding wind binary WR65We report the discovery of variability in the X-ray emission from the Wolf-Rayet type star WR 65. Using archival Chandra data spanning over 5 yr we detect changes of the X-ray flux by a factor of 3…L. M. Oskinova, W. -R. Hamann·Sep 16, 2008SaveLearn
The Least Luminous Galaxy: Spectroscopy of the Milky Way Satellite Segue 1We present Keck/DEIMOS spectroscopy of Segue 1, an ultra-low luminosity (MV = -1.5) Milky Way satellite companion. While the combined size and luminosity of Segue 1 are consistent with either a…Marla Geha, Beth Willman, Josh D. Simon et al.·Sep 16, 2008SaveLearn
Large Scale Structure traced by Molecular Gas at High RedshiftWe present observations of redshifted CO(1-0) and CO(2-1) in a field containing an overdensity of Lyman break galaxies (LBGs) at z=5.12. Our Australia Telescope Compact Array observations were…E. R. Stanway, M. N. Bremer, L. J. M. Davies et al.·Sep 16, 2008SaveLearn
Polarimetry from the Ground UpGround-based solar polarimetry has made great progress over the last decade. Nevertheless, polarimetry is still an afterthought in most telescope and instrument designs, and most polarimeters are…C. U. Keller, F. Snik·Sep 16, 2008SaveLearn
Single-hit criterion in DAMA/LIBRA DM search and daemons - they are anything but weakly interactingOur prediction that the more massive DAMA/LIBRA detector would detect a smaller number of events per unit of mass and time than the DAMA/NaI system has got confirmation. This is easy to understand,…E. M. Drobyshevski·Sep 16, 2008SaveLearn
High-Resolution Neutron Capture and Total Cross-Section Measurements, and the Astrophysical 95Mo(n,gamma) Reaction Rate at s-process TemperaturesAbundances of Mo isotopes predicted by stellar models of the s process are, except for 95Mo, in good agreement with data from single grains of mainstream presolar SiC. Because the meteorite data…P. E. Koehler, J. A. Harvey, K. H. Guber et al.·Sep 16, 2008SaveLearn
Stochastic Electron Acceleration in Shell-Type Supernova Remnants IIWe discuss the generic characteristics of stochastic particle acceleration by a fully developed turbulence spectrum and show that resonant interactions of particles with high speed waves dominate the…Siming Liu, Zhong-Hui Fan, Christopher L. Fryer·Sep 16, 2008SaveLearn
A one-parameter family of interpolating kernels for Smoothed Particle Hydrodynamics studiesA set of interpolating functions of the type f(v)=(sin[v pi/2])/(v pi/2)n is analyzed in the context of the smoothed-particle hydrodynamics (SPH) technique. The behaviour of these kernels for…Ruben M. Cabezon, Domingo Garcia-Senz, Antonio Relaño·Sep 16, 2008SaveLearn
Frequency spectra of cosmic ray air shower radio emission measured with LOPESAIMS: We wish to study the spectral dependence of the radio emission from cosmic-ray air showers around 100 PeV (1017 eV). METHODS: We observe short radio pulses in a broad frequency band with the…A. Nigl·Sep 16, 2008SaveLearn
The magnetic environment in the central region of nearby galaxiesThe central regions of galaxies harbor some of the most extreme physical phenomena, including dense stellar clusters, non-circular motions of molecular clouds and strong and pervasive magnetic field…Cornelia C. Lang, Maria R. Drout·Sep 16, 2008SaveLearn
Mesospheric vertical thermal structure and winds on Venus from HHSMT CO spectral-line observationsWe report vertical thermal structure and wind velocities in the Venusian mesosphere retrieved from carbon monoxide (12CO J=2-1 and 13CO J=2-1) spectral line observations obtained with the Heinrich…M. Rengel, P. Hartogh, C. Jarchow·Sep 16, 2008SaveLearn
Direction identification in radio images of cosmic-ray air showers detected with LOPES and KASCADEAIMS: We want to understand the emission mechanism of radio emission from air showers to determine the origin of high-energy cosmic rays. Therefore, we study the geometry of the air shower radio…A. Nigl·Sep 16, 2008SaveLearn
VLBI observations of jupiter with the initial test station of LOFAR and the nancay decametric arrayAIMS: To demonstrate and test the capability of the next generation of low-frequency radio telescopes to perform high resolution observations across intra-continental baselines. Jupiter's strong…A. Nigl, P. Zarka, J. Kuijpers et al.·Sep 16, 2008SaveLearn
New distance and depth estimates from observations of eclipsing binaries in the SMCA sample of 33 eclipsing binaries observed in a field of the SMC with FLAMES@VLT is presented. The radial velocity curves obtained, together with existing OGLE light curves, allowed the determination…Pierre L. North, Romain Gauderon, Frederic Royer·Sep 16, 2008SaveLearn
Cosmic rays studied with a hybrid high school detector arrayThe LORUN/NAHSA system is a pathfinder for hybrid cosmic ray research combined with education and outreach in the field of astro-particle physics. Particle detectors and radio antennae were mainly…A. Nigl, C. Timmermans, P. Schellart et al.·Sep 16, 2008SaveLearn
2MASS Two-color Interstellar Reddening Line in the Direction of the North America and Pelican Nebulae and the Cyg OB2 AssociationThe slope of the interstellar reddening line in the J-H vs. H-Ks diagram of the 2MASS survey in the direction of the North America and Pelican nebulae, the L935 dust cloud and the Cyg OB2 association…V. Straizys, C. J. Corbally, V. Laugalys·Sep 16, 2008SaveLearn
The structure of molecular clouds and the universality of the clump mass functionUsing an SPH simulation of a star-forming region in a molecular cloud, we show that the emergence of a clump mass function (CMF) resembling the stellar initial mass function (IMF) is a ubiquitous…Rowan J. Smith, Paul C. Clark, Ian A. Bonnell·Sep 16, 2008SaveLearn
Association of the 3:2 HFQPO Pairs with the Broad Fe K Line in XTE J1550-564 and GRO J1655-40Association of the high-frequency quasi-periodic oscillation (HFQPO) pairs with the broad Fe K line in XTE J1550-564 and GRO J1655-40 is discussed based on the magnetic coupling (MC) of a rotating…Ding-Xiong Wang, Zhao-Ming Gan, Chang-Yin Huang et al.·Sep 16, 2008SaveLearn
Proper motions with Subaru I. Methods and a first sample in the Subaru Deep FieldWe search for stars with proper motions in a set of twenty deep Subaru images, covering about 0.28 square degrees to a depth of i ~ 25, taken over a span of six years. In this paper, we describe in…Michael W. Richmond, Tomoki Morokuma, Mamoru Doi et al.·Sep 16, 2008SaveLearn
The clustering and abundance of star-forming and passive galaxies at z 2We use the UKIDSS Ultra-deep survey (UDS), currently the deepest panoramic near infra-red survey, together with deep Subaru optical imaging to measure the clustering, number counts and luminosity…W. G. Hartley, K. P. Lane, O. Almaini et al.·Sep 16, 2008SaveLearn