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Astrophysics papers — page 132

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Polarized Far-Infrared and Submillimeter Emission from Interstellar Dust
Polarized far-infrared and submillimeter emission is calculated for models of nonspherical dust grains that are constrained to reproduce the observed wavelength-dependent extinction and polarization…
Bruce T. Draine, Aurélien A. FraisseSep 11, 2008
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Properties of Galaxies Hosting X-ray Selected Active Galactic Nuclei in the Cl1604 Supercluster at z=0.9
To investigate the role of feedback from Active Galactic Nuclei (AGN) in driving the evolution of their host galaxies, we have carried out a study of the environments and optical properties of…
Dale D. Kocevski, Lori M. Lubin, Brian C. Lemaux et al.Sep 11, 2008
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Evolution of the Radio Loud Galaxy Population
A catalogue of 14453 radio-loud AGN with 1.4 GHz fluxes above 3.5 mJy in the redshift range 0.4<z<0.8, has been constructed from the cross-correlation of the NVSS and FIRST radio surveys with the…
E. Donoso, P. N. Best, G. KauffmannSep 11, 2008
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Cometary Astropause of Mira Revealed in the Far-Infrared
Evolved mass-losing stars such as Mira enrich the interstellar medium (ISM) significantly by their dust-rich molecular wind. When these stars move fast enough relative to the ISM, the interaction…
Toshiya UetaSep 11, 2008
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Alignment of Galaxies and Clusters
We investigated the influence of environment on cluster galaxies by examining the alignment of the brightest cluster galaxy (BCG) position angle with respect to the host cluster X-ray position angle.…
Yasuhiro Hashimoto, J. Patrick Henry, Hans BoehringerSep 11, 2008
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Magnetic fields and chemical peculiarities of the very young intermediate-mass binary system HD 72106
The recently discovered magnetic Herbig Ae and Be stars may provide qualitatively new information about the formation and evolution of magnetic Ap and Bp stars. We have performed a detailed…
C. P. Folsom, G. A. Wade, O. Kochukhov et al.Sep 11, 2008
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The dense ring in the Coalsack: the merging of two subsonic flows
A recent high angular resolution extinction map toward the most opaque molecular globule, Globule 2, in the Coalsack Nebula revealed that it contains a strong central ring of dust column density.…
J. M. Rathborne, C. J. Lada, W. Walsh et al.Sep 11, 2008
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Early Universe Constraints on Time Variation of Fundamental Constants
We study the time variation of fundamental constants in the early Universe. Using data from primordial light nuclei abundances, CMB and the 2dFGRS power spectrum, we put constraints on the time…
Susana J. Landau, Mercedes E. Mosquera, Claudia G. Scoccola et al.Sep 11, 2008
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Photometric redshifts as a tool to study the Coma cluster galaxy populations
We investigate the Coma cluster galaxy luminosity function (GLF) at faint magnitudes, in particular in the u* band by applying photometric redshift techniques applied to deep u*, B, V, R, I images…
C. Adami, O. Ilbert, R. Pello et al.Sep 11, 2008
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Star Formation in the Trifid Nebula
We have obtained maps of the 1.25mm thermal dust emission and the molecular gas emission over a region of 20' by 10' arcmin around the Trifid Nebula (M20), with the IRAM 30m and the CSO…
B. Lefloch, J. Cernicharo, J. R. PardoSep 11, 2008
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Dusty Cometary Globules in W5
We report the discovery of four dusty cometary tails around low mass stars in two young clusters belonging to the W5 star forming region. Fits to the observed emission profiles from 24 micron…
X. P. Koenig, L. E. Allen, S. J. Kenyon et al.Sep 11, 2008
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Searching for Pop III stars and galaxies at high redshift
We review the expected properties of Pop III and very metal-poor starburst and the behaviour the Lyman-alpha and HeII 1640 emission lines, which are most likely the best/easiest signatures to single…
Daniel SchaererSep 11, 2008
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Double-mode classical Cepheid models - revisited
For many years modeling of double-mode pulsation of classical pulsators was a challenging problem. Inclusion of turbulent convection into pulsation hydrocodes finally led to stable double-mode…
R. Smolec, P. MoskalikSep 11, 2008
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Convective hydrocodes for radial stellar pulsation. Physical and numerical formulation
In this paper we describe our convective hydrocodes for radial stellar pulsation. We adopt the Kuhfuss (1986) model of convection, reformulated for the use in stellar pulsation hydrocodes. Physical…
R. Smolec, P. MoskalikSep 11, 2008
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The contact binary GSC 04778-00152 with a visual companion
Photometric and spectroscopic observations of the unstudied 12th-magnitude eclipsing binary GSC 04778-00152 are presented. We report the discovery of a visual companion about 1 mag fainter and 2…
T. Tuvikene, T. Eenmäe, C. Sterken et al.Sep 11, 2008
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Photometry and polarimetry of the nucleus of comet 2P/Encke
Broadband imaging photometry, and broadband and narrowband linear polarimetry was measured for the nucleus of 2P/Encke over the phase-angle range 4 - 28 deg. An analysis of the point spread function…
H. Boehnhardt, G. P. Tozzi, S. Bagnulo et al.Sep 11, 2008
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The nature of the methanol maser ring G23.657-00.127
Methanol masers are associated with young high-mass stars and are an important tool for investigating the process of massive star formation. The recently discovered methanol maser ring in…
A. Bartkiewicz, A. Brunthaler, M. Szymczak et al.Sep 11, 2008
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The Spatial Evolution of Stellar Structures in the LMC/SMC
We present an analysis of the spatial distribution of various stellar populations within the Large and Small Magellanic Clouds. We use optically selected stellar samples with mean ages between ~9 and…
N. Bastian, M. Gieles, B. Ercolano et al.Sep 11, 2008
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GMC formation by agglomeration and self gravity
We investigate the formation of GMCs in spiral galaxies through both agglomeration of clouds in the spiral arms, and self gravity. The simulations presented include two-fluid models, which contain…
Clare DobbsSep 11, 2008
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High precision X-ray logN-logS distributions: implications for the obscured AGN population
We have constrained the extragalactic source count distributions over a broad range of X-ray fluxes and in various energy bands to test whether the predictions from X-ray background synthesis models…
S. Mateos, R. S. Warwick, F. J. Carrera et al.Sep 11, 2008
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Smart detectors for Monte Carlo radiative transfer
Many optimization techniques have been invented to reduce the noise that is inherent in Monte Carlo radiative transfer simulations. As the typical detectors used in Monte Carlo simulations do not…
Maarten BaesSep 11, 2008
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Determining the WIMP mass from a single direct detection experiment
The energy spectrum of nuclear recoils in Weakly Interacting Massive Particle (WIMP) direct detection experiments depends on the underlying WIMP mass (strongly for light WIMPs, weakly for heavy…
Anne M GreenSep 11, 2008
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Halo Occupation Distribution Modeling of Clustering of Luminous Red Galaxies
We perform Halo Occupation Distribution (HOD) modeling to interpret small-scale and intermediate-scale clustering of 35,000 luminous early-type galaxies and their cross-correlation with a reference…
Zheng Zheng, Idit Zehavi, Daniel J. Eisenstein et al.Sep 10, 2008
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Population boundaries for compact white-dwarf binaries in LISA's amplitude-frequency domain
In an earlier investigation, we proposed population boundaries for both inspiralling and mass-transferring double white dwarf (DWD) systems in the distance independent "absolute"…
Ravi kumar KopparapuSep 10, 2008
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An Upper Mass Limit on a Red Supergiant Progenitor for the Type II-Plateau Supernova SN 2006my
We analyze two pre-supernova (SN) and three post-SN high-resolution images of the site of the Type II-Plateau supernova SN 2006my in an effort to either detect the progenitor star or to constrain its…
Douglas C. Leonard, Avishay Gal-Yam, Derek B. Fox et al.Sep 10, 2008
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