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Astrophysics papers — page 157

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On the formation and abundance of CO in AGB envelopes
It is generally considered, as a rule of thumb, that carbon monoxide forms very early in envelopes of AGB stars, and that it consumes most of the carbon, or most of the oxygen, depending on whether…
Renaud PapoularAug 20, 2008
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A mid-infrared study of HII regions in the Magellanic Clouds: N88A and N160A
To show the importance of high-spatial resolution observations of HII regions when compared with observations obtained with larger apertures such as ISO, we present mid-infrared spectra of two…
N. L. Martin-Hernandez, E. Peeters, A. G. G. M. TielensAug 20, 2008
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Core Formation in Giant Gaseous Protoplanets
Sedimentation rates of silicate grains in gas giant protoplanets formed by disk instability are calculated for protoplanetary masses between 1 MSaturn to 10 MJupiter. Giant protoplanets with masses…
Ravit Helled, Gerald SchubertAug 20, 2008
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Tidal Heating of Terrestrial Extra-Solar Planets and Implications for their Habitability
The tidal heating of hypothetical rocky (or terrestrial) extra-solar planets spans a wide range of values depending on stellar masses and initial orbits. Tidal heating may be sufficiently large (in…
Brian Jackson, Rory Barnes, Richard GreenbergAug 20, 2008
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Relation Between Stellar Mass and Star Formation Activity in Galaxies
For a mass-selected sample of 66544 galaxies with photometric redshifts from the Cosmic Evolution Survey (COSMOS), we examine the evolution of star formation activity as a function of stellar mass in…
Bahram Mobasher, T. Dahlen, A. Hopkins et al.Aug 20, 2008
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Static and Impulsive Models of Solar Active Regions
The physical modeling of active regions (ARs) and of the global coronal is receiving increasing interest lately. Recent attempts to model ARs using static equilibrium models were quite successful in…
S. Patsourakos, J. A. KlimchukAug 20, 2008
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Ionization front-driven turbulence in the clumpy interstellar medium
We present 3D radiation-gasdynamical simulations of an ionization front running into a dense clump. In our setup, a B0 star irradiates an overdensity which is at a distance of 10 pc and modelled as a…
Thomas Peters, Robi Banerjee, Ralf S. KlessenAug 20, 2008
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J1420--0545: The radio galaxy larger than 3C236
We report the discovery of the largest giant radio galaxy, J1420-0545: a FR type II radio source with an angular size of 17.4' identified with an optical galaxy at z=0.3067. Thus, the projected…
J. Machalski, D. Kozieł-Wierzbowska, M. Jamrozy et al.Aug 20, 2008
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Long term radio variability of AGN
A large number of AGN have been monitored for nearly 30 years at 22, 37 and 87 GHz in Metsähovi Radio Observatory. These data were combined with lower frequency 4.8, 8.0 and 14.5 GHz data from the…
T. Hovatta, M. Tornikoski, H. J. Lehto et al.Aug 20, 2008
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Modelling the evolution and nucleosynthesis of carbon-enhanced metal-poor stars
We present the results of binary population simulations of carbon-enhanced metal-poor (CEMP) stars. We show that nitrogen and fluorine are useful tracers of the origin of CEMP stars, and conclude…
O. R. Pols, R. G. Izzard, M. Lugaro et al.Aug 20, 2008
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Magnetic support of the optical emission line filaments in NGC 1275
The giant elliptical galaxy NGC 1275, at the centre of the Perseus cluster, is surrounded by a well-known giant nebulosity of emission-line filaments, which are plausibly about >108 yr old. The…
A. C. Fabian, R. M. Johnstone, J. S. Sanders et al.Aug 20, 2008
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A search for rapid pulsations in the magnetic cool chemically peculiar star HD3980
The Ap star HD3980 appears to be a promising roAp candidate based on its fundamental parameters, leading us to search for rapid pulsations with the VLT UV-Visual Echelle Spectrograph (UVES). A…
V. G. Elkin, D. W. Kurtz, L. M. Freyhammer et al.Aug 20, 2008
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AKARI/FIS Mapping of the ISM-Wind Bow Shock around Alpha Ori
We present 10' x 50' scan maps around an M supergiant Alpha Ori at 65, 90, 140 and 160 microns obtained with the AKARI Infrared Astronomy Satellite. Higher spatial resolution data with the…
Toshiya Ueta, Hideyuki Izumiura, Issei Yamamura et al.Aug 20, 2008
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Statistical Tools for Analyzing the Cosmic Ray Energy Spectrum
In this paper un-binned statistical tools for analyzing the cosmic ray energy spectrum are developed and illustrated with a simulated data set. The methods are designed to extract accurate and…
J. D. Hague, B. R. Becker, M. S. Gold et al.Aug 20, 2008
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Cosmology-Independent Distance Moduli of 42 Gamma-Ray Bursts between Redshift of 1.44 and 6.60
This report is an update and extension of our paper accepted for publication in ApJ (arXiv:0802.4262). Since objects at the same redshift should have the same luminosity distance and the distance…
Nan Liang, Shuang Nan ZhangAug 19, 2008
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Noise-Sustained Convective Instability in a Magnetized Taylor-Couette Flow
The helical magnetorotational instability of the magnetized Taylor-Couette flow is studied numerically in a finite cylinder. A distant upstream insulating boundary is shown to stabilize the…
Wei LiuAug 19, 2008
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Uniformly Rotating Homogeneous and Polytropic Rings in Newtonian Gravity
An analytical method is presented for treating the problem of a uniformly rotating, self-gravitating ring without a central body in Newtonian gravity. The method is based on an expansion about the…
David Petroff, Stefan HoratschekAug 19, 2008
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GRB 070714B - Discovery of the Highest Spectroscopically Confirmed Short Burst Redshift
We detect the optical afterglow and host galaxy of GRB 070714B. Our observations of the afterglow show an initial plateau in the lightcurve for approximately the first 5 to 25 minutes, then…
J. F. Graham, A. S. Fruchter, A. J. Levan et al.Aug 19, 2008
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Mirror dark matter discovered?
Recent astrophysical data indicates that dark matter shows a controversial behaviour in galaxy cluster collisions. In case of the notorious Bullet cluster, dark matter component of the cluster…
Z. K. SilagadzeAug 19, 2008
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MMT Hypervelocity Star Survey
We describe a new survey for unbound hypervelocity stars (HVSs), stars traveling with such extreme velocities that dynamical ejection from a massive black hole (MBH) is their most likely origin. We…
Warren R. Brown, Margaret J. Geller, Scott J. KenyonAug 19, 2008
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Galaxy density profiles and shapes -- I. simulation pipeline for lensing by realistic galaxy models
Studies of strong gravitational lensing in current and upcoming wide and deep photometric surveys, and of stellar kinematics from (integral-field) spectroscopy at increasing redshifts, promise to…
Glenn van de Ven, Rachel Mandelbaum, Charles R. KeetonAug 19, 2008
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Galaxy density profiles and shapes -- II. selection biases in strong lensing surveys
[Abridged] Many current and future astronomical surveys will rely on samples of strong gravitational lens systems to draw conclusions about galaxy mass distributions. We use a new strong lensing…
Rachel Mandelbaum, Glenn van de Ven, Charles R. KeetonAug 19, 2008
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A catalog of variable stars in the Kepler field of view found in the ASAS3-North data
We announce the release of the catalog of variable stars in the field of view of Kepler mission found from the analysis of the ASAS3-North VI photometry of about 250,000 stars.
A. Pigulski, G. Pojmanski, B. Pilecki et al.Aug 19, 2008
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The subhalo - satellite connection and the fate of disrupted satellite galaxies
In the standard paradigm, satellite galaxies are believed to be associated with the population of dark matter subhalos. In this paper, we use the conditional stellar mass functions of satellite…
Xiaohu Yang, H. J. Mo, Frank C. van den BoschAug 19, 2008
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Are There Meteors Originated from Near Earth Asteroid (25143) Itokawa?
As a result of a survey of Itokawid meteors (i.e., meteors originated from Near Earth Asteroid (25143) Itokawa = 1998SF36), from among the multi-station optical meteor orbit data of ~15000 orbits,…
K. Ohtsuka, S. Abe, M. Abe et al.Aug 19, 2008
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