A novel method for measuring the extragalactic background light: Fermi application to the lobes of Fornax AWe describe a new method for measuring the extragalactic background light (EBL) through the detection of γ-ray inverse Compton (IC) emission due to scattering of the EBL photons off relativistic…Markos Georganopoulos, Rita M. Sambruna, Demosthenes Kazanas et al.·Aug 29, 2008SaveLearn
Age determination of possible binary open clusters NGC 2383/NGC 2384 and Pismis 6/Pismis 8Based on 2MASS J and Ks photometry for the open star clusters NGC 2383, NGC 2384,Pismis 6, Pismis 8 and using color magnitude diagrams with isochrones fit, we found an age of (age) = 8.3…Valentin Kopchev, Petko Nedialkov, Georgy Petrov·Aug 29, 2008SaveLearn
AGILE detection of variable gamma-ray activity from the blazar S5 0716+714 in September-October 2007We report the gamma-ray activity from the intermediate BL Lac S5 0716+714 during observations acquired by the AGILE satellite in September and October 2007. These detections of activity were…A. W. Chen, F. D'Ammando, M. Villata et al.·Aug 29, 2008SaveLearn
Early Abnormal Temperature Structure of X-ray Looptop Source of Solar FlaresThis Letter is to investigate the physics of a newly discovered phenomenon -- contracting flare loops in the early phase of solar flares. In classical flare models, which were constructed based on…Jinhua Shen, Tuanhui Zhou, Haisheng Ji et al.·Aug 29, 2008SaveLearn
Probing the low-luminosity GRB population with new generation satellite detectorsWe compare the detection rates and redshift distributions of low-luminosity (LL) GRBs localized by Swift with those expected to be observed by the new generation satellite detectors on GLAST (now…A. Imerito, D. Coward, R. Burman et al.·Aug 29, 2008SaveLearn
The hidden HI-massive LIRG HIZOA J0836-43: Inside-out galaxy formationHIZOA J0836-43 is an extreme gas-rich (MHI=7.5×1010 M) disk galaxy which lies hidden behind the strongly obscuring Vela region of the Milky Way. Utilizing observations from…M. E. Cluver, T. H. Jarrett, P. N. Appleton et al.·Aug 29, 2008SaveLearn
The Visual Orbit of the 1.1-day Spectroscopic Binary σ2 Coronae Borealis from Interferometry at the CHARA ArrayWe present an updated spectroscopic orbit and a new visual orbit for the double-lined spectroscopic binary σ2 Coronae Borealis based on radial velocity measurements at the Oak Ridge Observatory in…Deepak Raghavan, Harold A. McAlister, Guillermo Torres et al.·Aug 29, 2008SaveLearn
The origin of lopsidedness in galaxiesIt has long been known that a large fraction of disc galaxies are lopsided. We simulate three different mechanisms that can induce lopsidedness: flyby interactions, gas accretion from cosmological…M. Mapelli, B. Moore, J. Bland-Hawthorn·Aug 29, 2008SaveLearn
Non-thermal emission from supernova shock breakout and the origin of the X-ray transient associated with SN2008DWe suggest that non-thermal emission can be produced by multiple scatterings of the photons between the supernova ejecta and pre-shock material in supernova shock breakout. Such bulk-Comptonization…Xiang-Yu Wang, Zhuo Li, Eli Waxman et al.·Aug 29, 2008SaveLearn
Dark Bursts in the Swift Era: The Palomar 60 inch-Swift Early Optical Afterglow CatalogWe present multi-color optical observations of long-duration gamma-ray bursts (GRBs) made over a three year period with the robotic Palomar 60 inch telescope (P60). Our sample consists of all 29…S. B. Cenko, J. Kelemen, F. A. Harrison et al.·Aug 29, 2008SaveLearn
Solar Coronal Structures and Stray Light in TRACEUsing the 2004 Venus transit of the Sun to constrain a semi-empirical point-spread function for the TRACE EUV solar telescope, we have measured the effect of stray light in that telescope. We find…C. E. DeForest, P. C. H. Martens, M. J. Wills-Davey·Aug 29, 2008SaveLearn
Measuring the undetectable: Proper motions and parallaxes of very faint sourcesThe near future of astrophysics involves many large solid-angle, multi-epoch, multi-band imaging surveys. These surveys will, at their faint limits, have data on large numbers of sources that are too…Dustin Lang, David W. Hogg, Sebastian Jester et al.·Aug 28, 2008SaveLearn
Modeling Stellar Atmospheres with a Spherically Symmetric Version of the Atlas Code: Testing the Code by Comparisons to Interferometric Observations and PHOENIX ModelsOne of the current opportunities for stellar atmospheric modeling is the interpretation of optical interferometric data of stars. Starting from the robust, open source ATLAS atmospheric code (Kurucz,…Hilding R. Neilson, John B. Lester·Aug 28, 2008SaveLearn
Implications for C-14 Dating of the Jenkins-Fischbach Effect and Possible Fluctuation of the Solar Fusion RateIt has long been known that the C-14 calibration curve, which relates the known age of tree rings to their apparent C-14 ages, includes a number of "wiggles" which clearly are not…Alvin J. Sanders·Aug 28, 2008SaveLearn
Minimal Dark Matter predictions and the PAMELA positron excessWe present Minimal Dark Matter and its univocal predictions for Dark Matter observables. During the idm2008 conference, PAMELA presented preliminary results showing an excess in the positron…Marco Cirelli, Alessandro Strumia·Aug 28, 2008SaveLearn
XAX: a multi-ton, multi-target detection system for dark matter, double beta decay and pp solar neutrinosA multi-target detection system XAX, comprising concentric 10 ton targets of 136Xe and 129/131Xe, together with a geometrically similar or larger target of liquid Ar, is described. Each is configured…K. Arisaka, H. Wang, P. F. Smith et al.·Aug 28, 2008SaveLearn
The Swift capture of a long X-ray burst from XTE J1701-407XTE J1701-407 is a new transient X-ray source discovered on June 8th, 2008. More than one month later it showed a rare type of thermonuclear explosion: a long type I X-ray burst. We report herein the…Manuel Linares, Anna L. Watts, Rudy Wijnands et al.·Aug 28, 2008SaveLearn
Lithium depletion and the rotational history of exoplanet host starsIsraelian et al. (2004) reported that exoplanet host stars are lithium depleted compared to solar-type stars without detected massive planets, a result recently confirmed by Gonzalez (2008). We…Jerome Bouvier·Aug 28, 2008SaveLearn
A nanoflare model for active region radiance: application of artificial neural networksContext. Nanoflares are small impulsive bursts of energy that blend with and possibly make up much of the solar background emission. Determining their frequency and energy input is central to…M. Bazarghan, H. Safari, D. E. Innes et al.·Aug 28, 2008SaveLearn
X-ray stellar population of the LMCIn the study of stars, the high energy domain occupies a place of choice, since it is the only one able to directly probe the most violent phenomena: indeed, young pre-main sequence objects, hot…Yael Naze·Aug 28, 2008SaveLearn
Crash-testing the CAULDRON code for joint lensing and dynamics analysis of early-type galaxiesWe apply the joint lensing and dynamics code for the analysis of early-type galaxies, CAULDRON, to a rotating N-body stellar system with dark matter halo which significantly violates the two major…Matteo Barnabe, Carlo Nipoti, Leon V. E. Koopmans et al.·Aug 28, 2008SaveLearn
A deep look into the cores of young clusters I. sigma-OrionisNearby young clusters are privileged places to study the star formation history. Over the last decade, the sigma-Orionis cluster has been a prime location for the study of young very low mass stars,…H. Bouy, N. Huelamo, E. L. Martin et al.·Aug 28, 2008SaveLearn
The star ingesting luminosity of intermediate mass black holes in globular clustersThe dynamics of stars in the inner regions of nearby globular clusters (GCs) such as G1 indicate the presence of central concentrated dark masses, and one would like to know whether these are indeed…Enrico Ramirez-Ruiz, Stephan Rosswog·Aug 28, 2008SaveLearn
Chandra X-ray spectroscopy of the focused wind in the Cygnus X-1 system. I. The non-dip spectrum in the low/hard stateWe present analyses of a 50 ks observation of the supergiant X-ray binary system Cygnus X-1/HDE 226868 taken with the Chandra High Energy Transmission Grating Spectrometer (HETGS). Cyg X-1 was in its…Manfred Hanke, Joern Wilms, Michael A. Nowak et al.·Aug 28, 2008SaveLearn
Does the accreting millisecond pulsar XTE J1814-338 precess?Precession in an accretion-powered pulsar is expected to produce characteristic variations in the pulse properties. Assuming surface intensity maps with one and two hotspots, we compute theoretically…C. T. Y. Chung, D. K. Galloway, A. Melatos·Aug 28, 2008SaveLearn