Trigonometric Parallaxes of Massive Star Forming Regions: I. S 252 & G232.6+1.0We are conducting a large program with the NRAO Very Long Baseline Array (VLBA) to measure trigonometric parallaxes of massive star-forming regions across the Milky Way. Here we report measurement of…M. J. Reid, K. M. Menten, A. Brunthaler et al.·Nov 4, 2008SaveLearn
The M-Sigma ProjectThere is an intimate link between supermassive black hole (SMBH) mass (M) and the stellar velocity dispersion (sigma) of the host bulge. This has a fundamental impact on our understanding of galaxy…D. Batcheldor·Nov 4, 2008SaveLearn
High energy variability of 3C 273 during the AGILE multiwavelength campaign of December 2007 - January 2008We report the results of a 3-weeks multi-wavelength campaign on the flat spectrum radio quasar 3C 273 carried out with the AGILE gamma-ray mission, covering the 30 MeV -50 GeV and 18-60 keV, the REM…L. Pacciani, I. Donnarumma, V. Vittorini et al.·Nov 4, 2008SaveLearn
Dynamical masses for the nearest brown dwarf binary: Epsilon Indi Ba, BbWe present preliminary astrometric results for the closest known brown dwarf binary to the Sun: Epsilon Indi Ba, Bb at a distance of 3.626 pc. Via ongoing monitoring of the relative separation of the…C. V. Cardoso, M. J. McCaughrean, R. R. King et al.·Nov 4, 2008SaveLearn
HD 271791: An Extreme Supernova Runaway B Star Escaping from the GalaxyHyper-velocity stars (HVSs) were first predicted by theory to be the result of the tidal disruption of a binary system by a super-massive black hole (SMBH) that accelerates one component to beyond…Norbert Przybilla, Maria-Fernanda Nieva, Ulrich Heber et al.·Nov 4, 2008SaveLearn
Hypervelocity Stars and the Galactic CenterA summary of the current knowledge on hypervelocity stars (HVSs). HVSs are fascinating because their properties are linked to Sgr A* and the stellar environment of the Galactic Center. Observing the…Warren R. Brown·Nov 4, 2008SaveLearn
The Full Spectrum Galactic Terrarium: MHz to TeV Observations of Various CrittersMulti-wavelength studies at radio, infrared, optical, X-ray, and TeV wavelengths have discovered probable counterparts to many Galactic sources of GeV emission detected by EGRET. These include pulsar…Mallory S. E. Roberts, C. Brogan, S. Ransom et al.·Nov 4, 2008SaveLearn
Variation of the Light and Period of the Magnetic Cataclysmic Variable Am HerGround-based long-term optic variability of AM Her, covering the period between 2003-2008, has been conducted to study the features seen in both low and high states of the system. Low-state analysis…Belinda Kalomeni, Kadri Yakut·Nov 4, 2008SaveLearn
Kelu-1 AB - A possible brown dwarf triple systemWe have monitored the benchmark L dwarf binary Kelu-1AB over the past 3 years to derive improved spectral types and luminosities for the individual components. The astrometric measurements enable us…M. B. Stumpf, W. Brandner, Th. Henning et al.·Nov 4, 2008SaveLearn
Magnetic field amplification by SN-driven interstellar turbulenceWithin the interstellar medium, supernovae are thought to be the prevailing agents in driving turbulence. Until recently, their effects on magnetic field amplification in disk galaxies remained…Oliver Gressel, Udo Ziegler, Detlef Elstner·Nov 4, 2008SaveLearn
Polarimetric Diagnostics of Unresolved Chromospheric Magnetic FieldsFor about a decade, spectro-polarimetry of HeI 10830 has been applied to the magnetic diagnostics of the solar chromosphere. This resonance line is very versatile, as it is visible both on disk and…R. Casini, R. Manso Sainz, B. C. Low·Nov 4, 2008SaveLearn
High-resolution HNC 3-2 SMA observations of Arp220We present high resolution (0."4) observations of HNC J=3-2 with the SubMillimeter Array (SMA). We find luminous HNC 3-2 line emission in the western part of Arp220, centered on the western…S. Aalto, D. Wilner, M. Spaans et al.·Nov 4, 2008SaveLearn
The WEBT Campaign on the Intermediate BL Lac Object 3C66A in 2007-2008Prompted by a high optical state in September 2007, the Whole Earth Blazar Telescope (WEBT) consortium organized an intensive optical, near-IR (JHK) and radio observing campaign on the intermediate…M. Boettcher, K. Fultz·Nov 4, 2008SaveLearn
Exploring the spreading layer of GX 9+9 using RXTE and INTEGRALWe have fitted ~200 RXTE and INTEGRAL spectra of the neutron star LMXB GX 9+9 from 2002-2007 with a model consisting of a disc blackbody and another blackbody representing the spreading layer (SL),…P. Savolainen, D. C. Hannikainen, O. Vilhu et al.·Nov 4, 2008SaveLearn
The High Angular Resolution Multiplicity of Massive StarsWe present the results of a speckle interferometric survey of Galactic massive stars that complements and expands upon a similar survey made over a decade ago. The speckle observations were made with…Brian D. Mason, William I. Hartkopf, Douglas R. Gies et al.·Nov 4, 2008SaveLearn
Mass loss from hot massive starsMass loss is a key process in the evolution of massive stars, and must be understood quantitatively to be successfully included in broader astrophysical applications. In this review, we discuss…J. Puls, J. S. Vink, F. Najarro·Nov 4, 2008SaveLearn
Supergranulation Scale Connection SimulationsResults of realistic simulations of solar surface convection on the scale of supergranules (96 Mm wide by 20 Mm deep) are presented. The simulations cover only 10% of the geometric depth of the solar…R. F. Stein, A. Nordlund, D. Georgobiani et al.·Nov 4, 2008SaveLearn
Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in a young Sun-like starThe space experiment CoRoT has recently detected transits by a hot Jupiter across the disc of an active G7V star (CoRoT-Exo-2a) that can be considered as a good proxy for the Sun at an age of…A. F. Lanza, I. Pagano, G. Leto et al.·Nov 4, 2008SaveLearn
Angular Momentum Loss by Magnetic Braking and Gravitational Radiation in Relativistic Binary StarsAngular momentum loss (AML) mechanisms and dynamical evolution owing to magnetic braking and gravitational radiation in relativistic binary stars (RBS) are studied with use of physical parameters…K. Yakut, B. Kalomeni, C. A. Tout·Nov 4, 2008SaveLearn
AGN population in the deepest hard X-ray extragalactic surveyWe present the results of the analysis of the AGN population in the deepest extragalactic hard X-ray survey. The survey is based on INTEGRAL observation of the 3C 273/Coma cluster region, and covers…S. Paltani, T. J. -L. Courvoisier, T. Dwelly et al.·Nov 4, 2008SaveLearn
The Lacerta OB1 AssociationLac OB1 is a nearby OB association in its final stage of star formation. While the member stars suggest an expansion time scale of tens of Myr, the latest star formation episode, as manifested by the…W. P. Chen, H. T. Lee·Nov 4, 2008SaveLearn
Introduction to Gravitational MicrolensingThe basic concepts of gravitational microlensing are introduced. We start with the lens equation, and then derive the image positions and magnifications. The statistical quantities of optical depth…Shude Mao·Nov 4, 2008SaveLearn
The Minimum Jeans Mass, Brown Dwarf Companion IMF, and Predictions for Detection of Y-type DwarfsCool L- and T-type objects were discovered first as companions to stars in 1988 and 1995, respectively. A certain example of the yet cooler Y-type spectral class (Teff <~ 500K?) has not been seen.…Ben Zuckerman, Inseok Song·Nov 4, 2008SaveLearn
High energy resolution hard X-ray and gamma-ray imagers using CdTe diode devicesWe developed CdTe double-sided strip detectors (DSDs or cross strip detectors) and evaluated their spectral and imaging performance for hard X-rays and gamma-rays. Though the double-sided strip…Shin Watanabe, Shin-nosuke Ishikawa, Hiroyuki Aono et al.·Nov 4, 2008SaveLearn
Variable Evolved Stars and YSOs Discovered in the Large Magellanic Cloud using the SAGE SurveyWe present initial results and source lists of variable sources in the Large Magellanic Cloud (LMC) for which we detect thermal infrared variability from the SAGE (Surveying the Agents of a…Uma P. Vijh, M. Meixner, B. Babler et al.·Nov 4, 2008SaveLearn