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Astrophysics papers — page 151

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The FIRST-2MASS Red Quasar Survey II: An anomalously high fraction of LoBALs in searches for dust-reddened quasars
We present results on a survey to find extremely dust-reddened Type-1 Quasars. Combining the FIRST radio survey, the 2MASS Infrared Survey and the Sloan Digital Sky Survey, we have selected a…
Tanya Urrutia, Robert H. Becker, Richard L. White et al.Aug 27, 2008
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Gravitational excitation of high frequency QPOs
We discuss the possibility that high-frequency QPOs in neutron-star binary systems may result from forced resonant oscillations of matter in the innermost parts of the accretion disc, excited by…
Zdeněk Stuchlík, Sushan Konar, John C. Miller et al.Aug 27, 2008
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Periodic Oscillations in the Intra-day Optical Light Curves of the Blazar S5 0716+714
We present results of a periodicity search of 20 intra-day variable optical light curves of the blazar S5 0716+714, selected from a database of 102 light curves spanning over three years. We use a…
Alok C. Gupta, A. K. Srivastava, Paul J. WiitaAug 27, 2008
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Conference Summary: Magellanic System - Stars, Gas and Galaxies
We provide a brief overview of some key issues that came out of the IAU 256 symposium on the Magellanic System (http://www.astro.keele.ac.uk/iaus256)
J. Bland-Hawthorn, J. S. GallagherAug 27, 2008
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Relics of structure formation: extra-planar gas and high-velocity clouds around the Andromeda Galaxy
Using the 100-m radio telescope at Effelsberg, we mapped a large area around the Andromeda Galaxy in the 21-cm line emission of neutral hydrogen to search for high-velocity clouds (HVCs) out to large…
Tobias Westmeier, Christian Brüns, Jürgen KerpAug 27, 2008
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CARMA Millimeter-Wave Aperture Synthesis Imaging of the HD 32297 Debris Disk
We present the first detection and mapping of the HD 32297 debris disk at 1.3 mm with the Combined Array for Research in Millimeter-wave Astronomy (CARMA). With a sub-arcsecond beam, this detection…
H. L. Maness, M. P. Fitzgerald, R. Paladini et al.Aug 27, 2008
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Compatibility of DAMA/LIBRA dark matter detection with other searches
The DAMA/NaI and DAMA/LIBRA annual modulation data, which may be interpreted as a signal for the existence of weakly interacting dark matter (WIMPs) in our galactic halo, are examined in light of…
Christopher Savage, Graciela Gelmini, Paolo Gondolo et al.Aug 26, 2008
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The Highly Eccentric Pre-Main Sequence Spectroscopic Binary RX J0529.3+1210
The young system RX J0529.3+1210 was initially identified as a single-lined spectroscopic binary. Using high-resolution infrared spectra, acquired with NIRSPEC on Keck II, we measured radial…
G. N. Mace, L. Prato, L. H. Wasserman et al.Aug 26, 2008
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Modeling He-rich subdwarfs through the hot-flasher Scenario
We present 1D numerical simulations aimed at studying the hot-flasher scenario for the formation of He-rich subdwarf stars. Sequences were calculated for a wide range of metallicities and physical…
M. M. Miller Bertolami, L. G. Althaus, K. Unglaub et al.Aug 26, 2008
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Temporal behaviour of global perturbations in compressible axisymmetric flows with free boundaries
The dynamics of small global perturbations in the form of linear combination of a finite number of non-axisymmetric eigenmodes is studied in two-dimensional approximation. The background flow is…
V. V. Zhuravlev, N. I. ShakuraAug 26, 2008
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Storm fronts over galaxy discs: Models of how waves generate extraplanar gas and its anomalous kinematics
The existence of partially ionized, diffuse gas and dust clouds at kiloparsec scale distances above the central planes of edge-on, galaxy discs was an unexpected discovery about 20 yrs ago.…
Curtis Struck, Daniel C. SmithAug 26, 2008
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The close environment of 24 micron galaxies at 0.6<z<1.0 in the COSMOS field
We investigate the close environment of 203 Spitzer 24 micron-selected sources at 0.6<z<1.0 using zCOSMOS-bright redshifts and spectra of I<22.5 AB mag galaxies, over 1.5 sq. deg. of the COSMOS…
K. I. Caputi, K. Kovac, M. Bolzonella et al.Aug 26, 2008
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Suzaku Observation of 30Dor C: A Supernova Remnant with the Largest Non-Thermal Shell
This paper reports on the Suzaku results of thermal and non-thermal features of 30 Dor C, a supernova remnant (SNR) in a superbubble of the Large Magellanic Cloud (LMC). The west rim exhibits a…
Hiroya Yamaguchi, Aya Bamba, Katsuji KoyamaAug 26, 2008
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On the stable configuration of ultra-relativistic material spheres. The solution for the extremely hot gas
During the last stage of collapse of a compact object into the horizon of events, the potential energy of its surface layer decreases to a negative value below all limits. The energy-conservation law…
L. NeslusanAug 26, 2008
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Long-term AGILE monitoring of the puzzling gamma-ray source 3EG J1835+5918
We present the AGILE gamma-ray observations of the field containing the puzzling gamma-ray source 3EG J1835+5918. This source is one of the most remarkable unidentified EGRET sources. An…
A. Bulgarelli, M. Tavani, P. Caraveo et al.Aug 26, 2008
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Subsurface Meridional Circulation in the Active Belts
Temporal variations of the subsurface meridional flow with the solar cycle have been reported by several authors. The measurements are typically averaged over periods of time during which surface…
I. Gonzalez Hernandez, S. Kholikov, F. Hill et al.Aug 26, 2008
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The Magnitude-Diameter Relation of Galaxies
We investigate the dependence of the luminosity-diameter relation of galaxies on the environment. This study is based on a comparison between the 80 galaxies in the Shapley-Ames Catalog that are…
Sidney van den BerghAug 26, 2008
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Lithium Depletion of Nearby Young Stellar Associations
We estimate cluster ages from lithium depletion in five pre-main-sequence groups found within 100 pc of the Sun: TW Hydrae Association, Eta Chamaeleontis Cluster, Beta Pictoris Moving Group,…
Erin Mentuch, Alexis Brandeker, Marten H. van Kerkwijk et al.Aug 26, 2008
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High accretion rates in magnetised Keplerian discs mediated by a Parker instability driven dynamo
Hydromagnetic stresses in accretion discs have been the subject of intense theoretical research over the past one and a half decades. Most of the disc simulations have assumed a small initial…
Anders Johansen, Yuri LevinAug 26, 2008
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A New Moment Method for Continuum Radiative Transfer in Cosmological Reionization
We introduce a new code for computing time-dependent continuum radiative transfer and non-equilibrium ionization states in static density fields with periodic boundaries. Our code solves the moments…
K. Finlator, F. Ozel, R. DaveAug 26, 2008
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Early-type galaxies in the near-infrared: 1.5-2.4μm spectroscopy
Near-infrared (hereafter NIR) data may provide complementary information to the traditional optical population synthesis analysis of unresolved stellar populations because the spectral energy…
M. Cesetti, V. D. Ivanov, L. Morelli et al.Aug 26, 2008
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MHS sunspot model from deep sub-photospheric to chromospheric layers
In order to understand the influence of magnetic fields on the propagation properties of waves, as derived from different local helioseismology techniques, forward modeling of waves is required. Such…
E. Khomenko, M. ColladosAug 26, 2008
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Mapping the Asymmetric Thick Disk: The Hercules Thick Disk Cloud
The stellar asymmetry of faint thick disk/inner halo stars in the first quadrant first reported by Larsen & Humphreys (1996) and investigated further by Parker et al. (2003, 2004) has been recently…
Jeffrey A. Larsen, Roberta M. Humphreys, Juan E. CabanelaAug 26, 2008
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In search of RR Lyrae type stars in eclipsing binary systems. OGLE052218.07-692827.4: an optical blend
During the OGLE-2 operation, Soszynski et al. (2003) found 3 LMC candidates for an RR Lyr-type component in an eclipsing binary system. Two of those have orbital periods that are too short to be…
A. Prsa, E. F. Guinan, E. J. Devinney et al.Aug 26, 2008
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Basic parameters of three star clusters in the Small Magellanic Cloud: Kron 11, Kron 63 and NGC 121
We present observations for three star clusters, Kron 11, Kron 63 and NGC 121, in the Small Magellanic Cloud. We have studied their structure and derived their fundamental parameters by means of…
G. Baume, N. E. D. Noël, E. Costa et al.Aug 26, 2008
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