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Astrophysics papers — page 87

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Solar neutrino variability and its implications for solar physics and neutrino physics
Recent coordinated power-spectrum analyses of radiochemical solar neutrino data and the solar irradiance have revealed a highly significant, high-Q common modulation at 11.85 yr-1. Since the…
P. A. SturrockOct 15, 2008
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A Catalog of Broad Absorption Line Quasars in Sloan Digital Sky Survey Data Release 5
We present a catalog of 5039 broad absorption line (BAL) quasars (QSOs) in the Sloan Digital Sky Survey (SDSS) Data Release 5 (DR5) QSO catalog that have absorption troughs covering a continuous…
Robert R. Gibson, Linhua Jiang, W. N. Brandt et al.Oct 15, 2008
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Detection of C5N- and vibrationally excited C6H in IRC +10216
We report the detection in the envelope of the C-rich star IRC +10216 of four series of lines with harmonically related frequencies: B1389, B1390, B1394 and B1401. The four series must arise from…
J. Cernicharo, M. Guélin, M. Agúndez et al.Oct 15, 2008
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Resolved Properties of Extragalactic Giant Molecular Clouds
Giant molecular clouds (GMCs) are the major reservoirs of molecular gas in galaxies, and the starting point for star formation. As such, their properties play a key role in setting the initial…
Alberto D. Bolatto, Adam K. Leroy, Erik Rosolowsky et al.Oct 15, 2008
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Gamma rays from star-forming regions
Star-forming regions have been tentatively associated with gamma-ray sources since the early days of the COS B satellite. After the Compton Gamma-Ray Observatory, the statistical evidence for such an…
Gustavo E. RomeroOct 15, 2008
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Star Formation Around Super-Massive Black Holes
The presence of young massive stars orbiting on eccentric rings within a few tenths of a parsec of the supermassive black hole in the Galactic centre is challenging for theories of star formation.…
I. A. Bonnell, W. K. M. RiceOct 15, 2008
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Measuring Solar Abundances with Seismology
The revision of the photospheric abundances proferred by Asplund et al has rendered opacity theory inconsistent with the seismologically determined opacity through the Sun. This highlights the need…
Katie Mussack, Douglas GoughOct 15, 2008
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Discovery of two distinct polarimetric behaviours of trans-Neptunian objects
Trans-Neptunian objects (TNOs) contain the most primitive and thermally least-processed materials from the early accretional phase of the solar system. They allow us to study interrelations between…
S. Bagnulo, I. Belskaya, K. Muinonen et al.Oct 15, 2008
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X-ray polarimetry on-board HXMT
The development of micropixel gas detectors, capable to image tracks produced in a gas by photoelectrons, makes possible to perform polarimetry of X-ray celestial sources in the focus of grazing…
Paolo Soffitta, Ronaldo Bellazzini, Gianpiero Tagliaferri et al.Oct 15, 2008
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The Detectability of Exo-Earths and Super-Earths Via Resonant Signatures in Exozodiacal Clouds
Directly imaging extrasolar terrestrial planets necessarily means contending with the astrophysical noise of exozodiacal dust and the resonant structures created by these planets in exozodiacal…
Christopher C. Stark, Marc J. KuchnerOct 15, 2008
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XPOL: a photoelectric polarimeter onboard XEUS
The XEUS mission incorporates two satellites: the Mirror Spacecraft with 5 m2 of collecting area at 1 keV and 2 m2 at 7 keV, and an imaging resolution of 5" HEW and the Payload Spacecraft which…
Enrico Costa, Ronaldo Bellazzini, Jean Bregeon et al.Oct 15, 2008
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The CO line SED and atomic carbon in IRAS F10214+4724
Using the IRAM 30m telescope and the Plateau de Bure interferometer we have detected the and the CO 3-2, 4-3, 6-5, 7-6 transitions as well as the dust continuum at 3 and 1.2 mm towards…
Y. Ao, A. Weiss, D. Downes et al.Oct 15, 2008
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The Gas Pixel Detector as an X-ray photoelectric polarimeter with a large field of view
The Gas Pixel Detector (GPD) is a new generation device which, thanks to its 50 um pixels, is capable of imaging the photoelectrons tracks produced by photoelectric absorption in a gas. Since the…
Fabio Muleri, Paolo Soffitta, Ronaldo Bellazzini et al.Oct 15, 2008
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Hyper-accreting black holes
Hyper-accretion disks are short-lived, powerful sources of neutrinos and magnetized jets. Such disks are plausible sources of gamma-ray bursts. This review describes the disk structure, the neutrino…
Andrei M. BeloborodovOct 15, 2008
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Discovery of gamma-ray emission from the shell-type supernova remnant RCW 86 with H.E.S.S
The shell-type supernova remnant (SNR) RCW 86, possibly associated with the historical supernova SN 185, with its relatively large size (about 40' in diameter) and the presence of non-thermal…
HESS Collaboration, F. AharonianOct 15, 2008
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A versatile facility for the calibration of X-ray polarimeters with polarized and unpolarized controlled beams
We devised and built a versatile facility for the calibration of the next generation X-ray polarimeters with unpolarized and polarized radiation. The former is produced at 5.9 keV by means of a Fe55…
Fabio Muleri, Paolo Soffitta, Ronaldo Bellazzini et al.Oct 15, 2008
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Methane T-Dwarf Candidates in the Star Forming Region IC 348
IC 348 is a young (t3Myr) and nearby (d340pc) star forming region in the Perseus molecular cloud. We performed a deep imaging survey using the MEGACAM (z-band) and WIRCAM (JHK and…
Andrew Burgess, Jerome Bouvier, Estelle MorauxOct 15, 2008
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Investigating the age and structure of the infrared old open clusters LK1, LK10, FSR1521 and FSR1555
(Abridged) - The combination of several mass-decreasing processes may critically affect the structure of open clusters (OCs), to the point that most dissolve into the field in a time-scale shorter…
Charles Bonatto, Eduardo BicaOct 15, 2008
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The Arcturus Moving Group: Its Place in the Galaxy
The Arcturus moving group is a well-populated example of phase space substructure within the thick disk of our Galaxy. Traditionally regarded as the remains of a dissolved open cluster, it has…
Mary E. K. Williams, Ken C. Freeman, Amina Helmi et al.Oct 15, 2008
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The magnetic field of solar prominences
In his famous monographs, Einar Tandberg-Hanssen writes that "the single, physically most important parameter to study in prominences may be the magnetic field. Shapes, motions, and in fact the…
F. PaletouOct 15, 2008
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Time evolution of the line emission from the inner circumstellar ring of SN 1987A and its hot spots
We present seven epochs between October 1999 and November 2007 of high resolution VLT/UVES echelle spectra of the ejecta-ring collision of SN 1987A. The fluxes of most of the narrow lines from the…
Per Groeningsson, Claes Fransson, Bruno Leibundgut et al.Oct 15, 2008
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An extended dust disk in a spiral galaxy; An occulting galaxy pair in ANGST
We present an analysis of an occulting galaxy pair, serendipitously discovered in ACS Nearby Galaxy Survey Treasury (ANGST) observations of NGC 253 taken with Hubble Space Telescope's Advanced…
B. W. Holwerda, W. C. Keel, B. Williams et al.Oct 15, 2008
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Metal-rich T-dwarfs in the Hyades cluster
We present the results of a search for brown dwarfs (BDs) and very low mass (VLM) stars in the 625 Myr-old, metal-rich ([Fe/H]=0.14) Hyades cluster. We performed a deep (I=23, z=22.5) photometric…
Jerome Bouvier, Tim Kendall, Gwendolyn MeeusOct 15, 2008
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Accelerating Cosmologies with Extended Product Spaces
Accelerating cosmologies in extra dimensional spaces have been studied. These extra dimensional spaces are products of many spaces. The physical behaviors of accelerating cosmologies are investigated…
Han Siong Ch'ngOct 15, 2008
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Outflows, Bubbles, and the Role of the Radio Jet: Direct Evidence for AGN Feedback at z~2
To accommodate the seemingly "anti-hierarchical" properties of galaxies near the upper end of the mass function within our hierarchical paradigm, current models of galaxy evolution postulate…
Nicole P. H. Nesvadba, Matt D. LehnertOct 15, 2008
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