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Astrophysics papers — page 162

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Spitzer's mid-infrared view on an outer Galaxy Infrared Dark Cloud candidate toward NGC 7538
Infrared Dark Clouds (IRDCs) represent the earliest observed stages of clustered star formation, characterized by large column densities of cold and dense molecular material observed in silhouette…
W. F. Frieswijk, M. Spaans, R. F. Shipman et al.Aug 14, 2008
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First Results From The Taiwanese-American Occultation Survey (TAOS)
Results from the first two years of data from the Taiwanese-American Occultation Survey (TAOS) are presented. Stars have been monitored photometrically at 4 Hz or 5 Hz to search for occultations by…
Z. -W. Zhang, F. B. Bianco, M. J. Lehner et al.Aug 14, 2008
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Search for Gravitational Wave Bursts from Soft Gamma Repeaters
We present the results of a LIGO search for short-duration gravitational waves (GWs) associated with Soft Gamma Repeater (SGR) bursts. This is the first search sensitive to neutron star f-modes,…
LIGO Scientific Collaboration, S. Barthelmy, N. Gehrels et al.Aug 14, 2008
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Measurement of the dark matter velocity anisotropy in galaxy clusters
The internal dynamics of a dark matter structure may have the remarkable property that the local temperature in the structure depends on direction. This is parametrized by the velocity anisotropy…
Ole Host, Steen H. Hansen, Rocco Piffaretti et al.Aug 14, 2008
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Magnetic field measurements of O stars with FORS1 at the VLT
The presence of magnetic fields in O-type stars has been suspected for a long time. The discovery of such fields would explain a wide range of well documented enigmatic phenomena in massive stars, in…
S. Hubrig, M. Schoeller, R. S. Schnerr et al.Aug 14, 2008
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X-ray pulsars through the eyes of INTEGRAL
Recent results of the spectral and timing analysis of X-ray pulsars in hard X-rays with the INTEGRAL observatory are reviewed. The evolution of the cyclotron line energy with the source luminosity…
A. Lutovinov, S. TsygankovAug 14, 2008
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Proton-Rich Nuclear Statistical Equilibrium
Proton-rich material in a state of nuclear statistical equilibrium (NSE) is one of the least studied regimes of nucleosynthesis. One reason for this is that after hydrogen burning, stellar evolution…
I. R. Seitenzahl, F. X. Timmes, A. Marin-Laflèche et al.Aug 14, 2008
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Detection of 6.7 GHz methanol absorption towards hot corinos
Methanol masers at 6.7 GHz have been found exclusively towards high-mass star forming regions. Recently, some Class 0 protostars have been found to display conditions similar to what are found in hot…
J. D. Pandian, S. Leurini, K. M. Menten et al.Aug 14, 2008
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LSD and AMAZE: the mass-metallicity relation at z>3
We present the first results on galaxy metallicity evolution at z>3 from two projects, LSD (Lyman-break galaxies Stellar populations and Dynamics) and AMAZE (Assessing the Mass Abundance redshift…
F. Mannucci, R. MaiolinoAug 14, 2008
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The Environmental Dependence of Properties of Galaxies around the RDCSJ0910+54 Cluster at z=1.1
(Abridged) We report on the environmental dependence of properties of galaxies around the RDCSJ0910+54 cluster at z=1.1. We have obtained multi-band wide-field images of the cluster with Suprime-Cam…
M. Tanaka, A. Finoguenov, T. Kodama et al.Aug 14, 2008
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Macroscopic Model of Geomagnetic-Radiation from Air Showers
We have developed a macroscopic description of coherent electro-magnetic radiation from air showers initiated by ultra-high energy cosmic rays in the presence of the geo-magnetic field. This…
Olaf Scholten, Klaus WernerAug 14, 2008
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Dust properties and distribution in dwarf galaxies
We present a study of the extinction, traced by the Balmer decrement, in HII regions in the dwarf galaxies NGC 1569 and NGC 4214. We find that the large-scale extinction around the most prominent HII…
U. Lisenfeld, M. Relano, J. Vilchez et al.Aug 14, 2008
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The effect of a stellar magnetic variation on the jet velocity
Stellar jets are normally constituted by chains of knots with some periodicity in their spatial distribution, corresponding to a variability of order of several years in the ejection from the…
Fabio De Colle, Jose Gracia, Gareth MurphyAug 14, 2008
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Unstable Disk Galaxies. II. the Origin of Growing and Stationary Modes
I decompose the unstable growing modes of stellar disks to their Fourier components and present the physical mechanism of instabilities in the context of resonances. When the equilibrium distribution…
Mir Abbas JalaliAug 14, 2008
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Blazing trails: Microquasars as head-tail sources and the seeding of magnetized plasma into the ISM
We discuss the dynamics of microquasar jets in the interstellar medium, with specific focus on the effects of the X-ray binaries' space velocity with respect to the local Galactic standard of…
S. Heinz, H. J. Grimm, R. A. Sunyaev et al.Aug 14, 2008
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Phantom Dark Energy Models with a Nearly Flat Potential
We examine phantom dark energy models produced by a field with a negative kinetic term and a potential that satisfies the slow roll conditions: [(1/V)(dV/dphi)]2 << 1 and (1/V)(d2 V/dphi2) << 1.…
Robert J. Scherrer, A. A. SenAug 13, 2008
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Mapping the Dark Matter From UV Light at High Redshift: An Empirical Approach to Understand Galaxy Statistics
We present a simple formalism to interpret two galaxy statistics, the UV luminosity function and two-point correlation functions for star-forming galaxies at z~4, 5, 6 in the context of LCDM…
K. -S. Lee, M. Giavalisco, C. Conroy et al.Aug 13, 2008
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Using radioactivities to improve the search for nearby radio-quiet neutron stars
Neutron stars (NS) and black holes (BH) are sources of gravitational waves (GW) and the investigation of young isolated radio-quiet NS can in principle lead to constraints of the equation of state…
Markus M. Hohle, Ralph Neuhaeuser, Nina TetzlaffAug 13, 2008
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Non-linear Redshift-Space Power Spectra
Distances in cosmology are usually inferred from observed redshifts - an estimate that is dependent on the local peculiar motion - giving a distorted view of the three dimensional structure and…
J. Richard Shaw, Antony LewisAug 13, 2008
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A general method of estimating stellar astrophysical parameters from photometry
Applying photometric catalogs to the study of the population of the Galaxy is obscured by the impossibility to map directly photometric colors into astrophysical parameters. Most of all-sky catalogs…
A. N. Belikov, S. RoeserAug 13, 2008
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The Cold Spot as a Large Void: Rees-Sciama effect on CMB Power Spectrum and Bispectrum
The detection of a "Cold Spot" in the CMB sky could be explained by the presence of an anomalously large spherical underdense region (with radius of a few hundreds Mpc/h) located between us…
Isabella Masina, Alessio NotariAug 13, 2008
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Neon and Chemical Fractionation Trends in Late-type Stellar Atmospheres
A survey of Ne, O and Fe coronal abundances culled from the recent literature for about 60 late-type stars confirms that the Ne/O ratio of stellar outer atmospheres is about two times the value…
D. Garcia-Alvarez, J. J. Drake, P. TestaAug 13, 2008
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The Stellar Populations of M33's Outer Regions IV: Inflow History and Chemical Evolution
We have modelled the observed color-magnitude diagram (CMD) at one location in M33's outskirts under the framework of a simple chemical evolution scenario which adopts instantaneous and delayed…
Michael K. Barker, Ata SarajediniAug 13, 2008
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A Computational Tool to Interpret the Bulk Composition of Solid Exoplanets based on Mass and Radius Measurements
The prospects for finding transiting exoplanets in the range of a few to 20 Earth masses is growing rapidly with both ground-based and spaced-based efforts. We describe a publicly available computer…
Li Zeng, Sara SeagerAug 13, 2008
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Transiting Exoplanets with JWST
The era of exoplanet characterization is upon us. For a subset of exoplanets -- the transiting planets -- physical properties can be measured, including mass, radius, and atmosphere characteristics.…
S. Seager, D. Deming, J. A. ValentiAug 13, 2008
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