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Astrophysics papers — page 79

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V1647 ORIONIS: Keck/Nirspec 2 MICRON Echelle Observations
We present new Keck II NIRSPEC high-spectral resolution 2 um echelle observations of the young eruptive variable star V1647 Orionis. This star went into outburst in late 2003 and faded to its…
Colin Aspin, Tom P. Greene, Bo ReipurthOct 21, 2008
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NEAR-IR Spectroscopy of Young Stars in the Braid Nebula Star Formation Region in Cygnus Ob7
We present 1.4 to 2.5 um integral field spectroscopy of 16 stars in the Braid Nebula star formation region in Cygnus OB7. These data forms one aspect of a large-scale multi-wavelength survey aimed at…
Colin Aspin, Tracy L. Beck, Tae-Soo Pyo et al.Oct 21, 2008
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Direct Distance Measurement to the Dusty White Dwarf GD 362
We present trigonometric parallax observations of GD 362 obtained over seven epochs using the MDM 2.4m Hiltner Telescope. The existence of a dust disk around this possibly massive white dwarf makes…
Mukremin Kilic, John R. Thorstensen, Detlev KoesterOct 21, 2008
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Enhanced lensing rate by clustering of massive galaxies: newly discovered systems in the SLACS fields
[Abridged] We exploit the clustering of massive galaxies to perform a high efficiency imaging search for gravitational lenses. Our dataset comprises 44 fields imaged by the Hubble Space Telescope…
Elisabeth R. Newton, Philip J. Marshall, Tommaso TreuOct 21, 2008
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Measuring Distance Ratios with CMB-Galaxy Lensing Cross-correlations
We propose a method for cosmographic measurements by combining gravitational lensing of the cosmic microwave background (CMB) with cosmic shear surveys. We cross-correlate the galaxy counts in the…
Sudeep Das, David N. SpergelOct 21, 2008
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Is there a standard measuring rod in the Universe?
The Caltech-Jodrell Bank very long baseline interferometry (VLBI) Surveys give detailed 5 GHz VLBI images of several hundred milliarcsecond (mas) radio sources, and the full width at half-maximum…
J. C. JacksonOct 21, 2008
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Highlights of multi-wavelengths surveys in the Zone of Avoidance
Rather than giving a complete overview on extragalactic Zone of Avoidance research, this paper will highlight some recent discoveries in the ZOA, such as new NIR to FIR observations (IRSF, Spitzer)…
R. C. Kraan-Korteweg, K. J. van der Heyden, M. E. Cluver et al.Oct 21, 2008
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The cosmological consequence of an obscured AGN population on the radiation efficiency
In light of recent indications for a large population of obscured active galactic nuclei (AGNs), we revisit the mean radiation efficiency from accretion onto supermassive black holes (SMBHs),…
Alejo Martinez-Sansigre, Andrew M. TaylorOct 21, 2008
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Evaluating and Improving Semi-analytic modelling of Dust in Galaxies based on Radiative Transfer Calculations
The treatment of dust attenuation is crucial in order to compare the predictions of galaxy formation models with multiwavelength observations. Most past studies have either used simple analytic…
Fabio Fontanot, Rachel S. Somerville, Laura Silva et al.Oct 21, 2008
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Planetary microlensing signals from the orbital motion of the source star around the common barycentre
With several detections, the technique of gravitational microlensing has proven useful for studying planets that orbit stars at Galactic distances, and it can even be applied to detect planets in…
S. Rahvar, M. DominikOct 21, 2008
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A structure and energy dissipation efficiency of relativistic reconfinement shocks
We present a semi-analytical hydrodynamical model for the structure of reconfinement shocks formed in astrophysical relativistic jets interacting with external medium. We take into account exact…
Krzysztof Nalewajko, Marek SikoraOct 21, 2008
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The Discovery of a Very Faint X-ray Transient in the Globular Cluster M15
We have identified an X-ray transient (hereafter M15 X-3) in the globular cluster M15 from an archival Chandra grating observation. M15 X-3 appears at an X-ray luminosity of 6*1033 ergs/s with a…
Craig O. Heinke, Haldan N. Cohn, Phyllis M. LuggerOct 21, 2008
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Fingers of God
Very long wavelength universal gravitational waves cannot now produce in clusters of galaxies velocity dispersions greater than that which these systems would possess if they were expanding with the…
J. C. JacksonOct 21, 2008
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Evidence for Blue Straggler Stars Rejuvenating the Integrated Spectra of Globular Clusters
Integrated spectroscopy is the method of choice for deriving the ages of unresolved stellar systems. However, hot stellar evolutionary stages, such as hot horizontal branch stars and blue straggler…
A. Javier Cenarro, J. L. Cervantes, Michael A. Beasley et al.Oct 21, 2008
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VHE Gamma-ray Afterglow Emission from Nearby GRBs
Gamma-ray Bursts (GRBs) are among the potential extragalactic sources of very-high-energy (VHE) gamma-rays. We discuss the prospects of detecting VHE gamma-rays with current ground-based Cherenkov…
P. H. Tam, R. R. Xue, S. J. Wagner et al.Oct 21, 2008
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The INTEGRAL-OMC Scientific Archive
The Optical Monitoring Camera (OMC) on-board the INTEGRAL satellite has, as one of its scientific goals, the observation of a large number of variable sources previously selected. After almost 6…
A. Domingo, R. Gutierrez-Sanchez, D. Risquez et al.Oct 21, 2008
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The UKIRT Infrared Deep Sky Survey and the search for the most distant quasars
The UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) has the necessary combination of filters (Y, J, H and K), depth (Y <~ 20.2) and area coverage (~4000 deg2) to detect several…
Daniel J. Mortlock, Mitesh Patel, Stephen J. Warren et al.Oct 21, 2008
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The inhomogeneous response across the solar disc of unresolved Doppler velocity observations
Unresolved Doppler velocity measurements are not homogenous across the solar disc (Brookes et al. 1978). We consider one cause of the inhomogeneity that originates from the BiSON instrumentation…
A. M. Broomhall, W. J. Chaplin, Y. Elsworth et al.Oct 21, 2008
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Molecular Tracers of Embedded Star Formation in Ophiuchus
In this paper we analyze nine SCUBA cores in Ophiuchus using the second-lowest rotational transitions of four molecular species (12CO, 13CO, C18O, and C17O) to search for clues to the evolutionary…
Melissa Gurney, Rene Plume, Doug JohnstoneOct 21, 2008
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Astronomical imaging: The theory of everything
We are developing automated systems to provide homogeneous calibration meta-data for heterogeneous imaging data, using the pixel content of the image alone where necessary. Standardized and complete…
David W. Hogg, Dustin LangOct 21, 2008
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Ejection of hypervelocity binary stars by a black hole of intermediate mass orbiting Sgr A*
The discovery of hypervelocity binary stars (HVBs) in the Galactic halo would provide definite evidence of the existence of a massive black hole companion to Sgr A*. Here we use an hybrid approach to…
A. Sesana, P. Madau, F. HaardtOct 21, 2008
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An enigmatic HI cloud
The discovery of an HI cloud with peculiar properties at equatorial coordinates (J2000) ra=07h49m, dec=04d30m is presented. The HI object was detected at 21cm using the 300-m NAIC Arecibo telescope.…
L. Dedes, C. Dedes, P. W. M KalberlaOct 21, 2008
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Asteroseismology of Red Giant stars
Sun-like oscillations, that is p-modes excited stochastically by convective noise, have now been observed in a number of Red Giant stars. Compared to those seen in the Sun, these modes are of large…
N. J. Tarrant, W. J. Chaplin, Y. P. Elsworth et al.Oct 21, 2008
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Capability of the PAMELA Time-Of-Flight to identify light nuclei: results from a beam test calibration
PAMELA is a space telescope orbiting around the Earth since June 2006. The scientific objectives addressed by the mission are the measurement of the antiprotons and positrons spectra in cosmic rays,…
D. Campana, R. Carbone, G. De Rosa et al.Oct 21, 2008
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Temperature and Metallicity in the Intra-cluster Medium of ABELL 262 observed with Suzaku
We studied the temperature and abundance distributions of intra-cluster medium (ICM) in the Abell 262 cluster of galaxies observed with Suzaku. Abell 262 is a bright, nearby poor cluster with ICM…
Kosuke Sato, Kyoko Matsushita, Fabio GastaldelloOct 21, 2008
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