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Astrophysics papers — page 171

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Millimeter- and Submillimeter-Wave Observations of the OMC-2/3 Region. III. An Extensive Survey for Molecular Outflows
Using the ASTE 10 m submillimeter telescope and the 1.4 m Infrared Survey Facility (IRSF), we performed an extensive outflow survey in the Orion Molecular Cloud -2 and -3 region. Our survey, which…
Satoko Takahashi, Masao Saito, Nagayoshi Ohashi et al.Aug 5, 2008
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Astrometry of H2O Masers in Nearby Star-Forming Regions with VERA. III. IRAS 22198+6336 in L1204G
We present results of multi-epoch VLBI observations with VERA (VLBI Exploration of Radio Astrometry) of the 22 GHz H2O masers associated with a young stellar object (YSO) IRAS 22198+6336 in a…
Tomoya Hirota, Kazuma Ando, Takeshi Bushimata et al.Aug 5, 2008
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The effect of two-temperature post-shock accretion flow on the linear polarization pulse in magnetic cataclysmic variables
The temperatures of electrons and ions in the post-shock accretion region of a magnetic cataclysmic variable (mCV) will be equal at sufficiently high mass flow rates or for sufficiently weak magnetic…
Gordon E. Sarty, Curtis J. Saxton, Kinwah WuAug 5, 2008
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The black hole fundamental plane: revisit with a larger sample of radio and X-ray emitting broad-line AGNs
We use a recently released SDSS catalog of X-ray emitting AGNs in conjunction with the FIRST 20cm radio survey to investigate the black hole fundamental plane relationship between the 1.4GHz radio…
Zhao-Yu Li, Xue-Bing Wu, Ran WangAug 5, 2008
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Discovery of Eclipsing Binary Central Stars in the Planetary Nebulae M 3-16, H 2-29 and M 2-19
Progress in understanding the formation and evolution of planetary nebulae (PN) has been restricted by a paucity of well-determined central star masses. To address this deficiency we aim to (i)…
B. Miszalski, A. Acker, A. F. J. Moffat et al.Aug 5, 2008
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Dynamical effects of the long bar in the Milky Way
We examine the dynamical effects on disk stars of a "long bar" in the Milky Way by inserting a triaxial rotating bar into an axisymmetric disk+bulge+dark halo potential and integrating 3-D…
Esko Gardner, Kimmo A. Innanen, Chris FlynnAug 4, 2008
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Simulations of AGN feedback in galaxy clusters and groups: impact on gas fractions and the Lx-T scaling relation
Recently, rapid observational and theoretical progress has established that black holes (BHs) play a decisive role in the formation and evolution of individual galaxies as well as galaxy groups and…
Ewald Puchwein, Debora Sijacki, Volker SpringelAug 4, 2008
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Physical conditions in nearby active galaxies correlated with ultra-high-energy cosmic rays detected by the Pierre Auger Observatory
We analyze the active-galaxy correlation reported in 2007 by the Pierre Auger Collaboration. The signal diminishes if the correlation-function approach (counting all "source-event" pairs and…
Sergey Gureev, Sergey TroitskyAug 4, 2008
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Physical conditions in potential sources of ultra-high-energy cosmic rays: Updated Hillas plot and radiation-loss constraints
We review basic constraints on the acceleration of ultra-high-energy (UHE) cosmic rays (CRs) in astrophysical sources, namely the geometrical (Hillas) criterion and restrictions from radiation losses…
Ksenia Ptitsyna, Sergey TroitskyAug 4, 2008
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Gamma Ray Burst Production and Supernova Signatures in Slowly Rotating Collapsars
We consider accretion onto newborn black holes following the collapse of rotating massive stellar cores, at the threshold where a centrifugally supported disk gives way to nearly radial inflow for…
Diego Lopez-Camara, William H. Lee, Enrico Ramirez-RuizAug 4, 2008
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Volume averaging in the quasispherical Szekeres model
This paper considers the volume averaging in the quasispherical Szekeres model. The volume averaging became of considerable interest after it was shown that the volume acceleration calculated within…
Krzysztof BolejkoAug 4, 2008
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Population III Supernovae and the Assembly of the First Galaxies
Current numerical studies suggest that the first galaxies formed a few stars at a time and were enriched only gradually by the first heavy elements. However, the large box sizes in these models…
Daniel Whalen, Bob Van Veelen, Brian W. O'Shea et al.Aug 4, 2008
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Exploring a New Population of Compact Objects: X-ray and IR Observations of the Galactic Centre
I describe the IR and X-ray observational campaign we have undertaken for the purpose of determining the nature of the faint discrete X-ray source population discovered by Chandra in the Galactic…
Reba M. Bandyopadhyay, Andrew J. Gosling, Stephen E. Eikenberry et al.Aug 4, 2008
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Stellar kinematics in double-barred galaxies: the sigma-hollows
We present SAURON integral-field stellar velocity and velocity dispersion maps for four double-barred early-type galaxies: NGC2859, NGC3941, NGC4725 and NGC5850. The presence of the inner bar does…
A. de Lorenzo-Cáceres, J. Falcón-Barroso, A. Vazdekis et al.Aug 4, 2008
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The volume densities of giant molecular clouds in M83
Using observed GALEX far-ultraviolet (FUV) fluxes and VLA images of the 21-cm HI column densities, along with estimates of the local dust abundances, we measure the volume densities of a sample of…
Jonathan S. Heiner, Ronald J. Allen, O. Ivy Wong et al.Aug 4, 2008
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The Mass of the Black Hole in the Quasar PG 2130+099
We present the results of a recent reverberation-mapping campaign undertaken to improve measurements of the radius of the broad line region and the central black hole mass of the quasar PG 2130+099.…
C. J. Grier, B. M. Peterson, M. C. Bentz et al.Aug 4, 2008
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The dust un-biased cosmic star formation history from the 20 cm VLA-COSMOS survey
We derive the cosmic star formation history (CSFH) out to z=1.3 using a sample of ~350 radio-selected star-forming galaxies, a far larger sample than in previous, similar studies. We attempt to…
V. Smolcic, E. Schinnerer, G. Zamorani et al.Aug 4, 2008
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Symplectic Integrator Mercury: Bug Report
We report on a problem found in MERCURY, a hybrid symplectic integrator used for dynamical problems in Astronomy. The variable that keeps track of bodies' statuses is uninitialised, which can…
K. de Souza Torres, D. R. AndersonAug 4, 2008
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Anomalous Emission from HII regions
Spinning dust appears to be the best explanation for the anomalous emission that has been observed at 10-60 GHz. One of the best examples of spinning dust comes from a HII region in the…
C. DickinsonAug 4, 2008
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Dark Stars: Dark Matter in the First Stars leads to a New Phase of Stellar Evolution
The first phase of stellar evolution in the history of the universe may be Dark Stars, powered by dark matter heating rather than by fusion. Weakly interacting massive particles, which are their own…
Katherine Freese, Douglas Spolyar, Anthony Aguirre et al.Aug 4, 2008
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Disks around Brown Dwarfs in the Sigma Orionis Cluster
We have performed a census of disks around brown dwarfs in the Sigma Ori cluster using all available images from IRAC onboard the Spitzer Space Telescope. To search for new low-mass cluster members…
K. L. Luhman, J. Hernandez, J. J. Downes et al.Aug 4, 2008
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X-ray Spectral Properties of the BAT AGN Sample
The 9-month Swift Burst Alert Telescope (BAT) catalog provides the first unbiased (log NH < 24) look at local (<z> = 0.03) AGN. In this paper, we present the collected X-ray properties (0.3 - 12keV)…
L. M. Winter, R. Mushotzky, C. S. Reynolds et al.Aug 4, 2008
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XMM-Newton Observations of the Nuclei of the Radio Galaxies 3C 305, DA 240, and 4C 73.08
We present new XMM-Newton EPIC observations of the nuclei of the nearby radio galaxies 3C 305, DA 240, and 4C 73.08, and investigate the origin of their nuclear X-ray emission. The nuclei of the…
Daniel A. Evans, Martin J. Hardcastle, Julia C. Lee et al.Aug 4, 2008
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Masses of Black Holes in the Universe
The different methods of determination of black holes (BHs) masses are presented for three classes of BHs observed in the Universe: stellar mass BHs, intermediate mass BHs (IMBHs) and supermassive…
Janusz ZiolkowskiAug 4, 2008
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Primordial non-Gaussianity estimator: the inhomogeneous noise effect
Since the inhomogeneous instrument noise can produce extra non-Gaussianity in the CMB anisotropy, its effect should be carefully subtracted in the primordial non-Gaussianity estimation. We calculate…
B. Yu, T. LuAug 4, 2008
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