A Blast Wave from the 1843 Eruption of Eta CarinaeVery massive stars shed much of their mass in violent precursor eruptions as luminous blue variables (LBVs) before reaching their most likely end as supernovae, but the cause of LBV eruptions is…Nathan Smith·Sep 9, 2008SaveLearn
On the nature of Delta Scuti star HD 115520Observing Delta Scuti stars is most important as their multi-frequency spectrum of radial pulsations provide strong constraints on the physics of the stars interior; so any new detection and…J. H. Pena, L. Fox Machado, B. Cervantes-Sodi et al.·Sep 9, 2008SaveLearn
XMM-Newton View of the Multi-Phase Warm Absorber in Seyfert 1 Galaxy NGC985We present an analysis of an XMM-Newton observation of the Seyfert 1 Galaxy NGC 985. The EPIC spectra present strong residuals to a single power-law model, indicating the presence of ionized…Yair Krongold, Elena Jimenez-Bailon, Maria Santos-Lleo et al.·Sep 9, 2008SaveLearn
Laser frequency combs for astronomical observationsA direct measurement of the universe's expansion history could be made by observing in real time the evolution of the cosmological redshift of distant objects. However, this would require…Tilo Steinmetz, Tobias Wilken, Constanza Araujo-Hauck et al.·Sep 9, 2008SaveLearn
The Red Sequence Luminosity Function in Massive Intermediate Redshift Galaxy ClustersWe measure the rest-frame B-band luminosity function of red-sequence galaxies (RSLF) of five intermediate-redshift (0.5 < z < 0.9), high-mass (sigma > 950 km/s) clusters. Cluster galaxies are…S. M. Crawford, M. A Bershady, J. G. Hoessel·Sep 9, 2008SaveLearn
Intrinsically Red Sources observed by Spitzer in the Galactic Mid-PlaneWe present a highly reliable flux-limited census of 18,949 point sources in the Galactic mid-plane that have intrinsically red mid-infrared colors. These sources were selected from the Spitzer Space…Thomas P. Robitaille, Marilyn R. Meade, Brian L. Babler et al.·Sep 9, 2008SaveLearn
Stability and structure of analytical MHD jet formation models with a finite outer disk radius(Abridged) Finite radius accretion disks are a strong candidate for launching astrophysical jets from their inner parts and disk-winds are considered as the basic component of such magnetically…Matthias Stute, Kanaris Tsinganos, Nektarios Vlahakis et al.·Sep 9, 2008SaveLearn
The Signature of the Ice Line and Modest Type I Migration in the Observed Exoplanet Mass-Semimajor Axis DistributionExisting exoplanet radial velocity surveys are complete in the planetary mass-semimajor axis (Mp-a) plane over the range 0.1 AU < a < 2.0 AU where Mp >~ 100 MEarth. We marginalize over mass in this…Kevin C. Schlaufman, D. N. C. Lin, S. Ida·Sep 9, 2008SaveLearn
Metallicity Analysis of MACHO Galactic Bulge RR0 Lyrae stars from their LightcurvesWe present metallicities of 2690 RR0 Lyrae stars observed toward the MACHO Survey fields in the Galactic Bulge. These [Fe/H] values are based upon an empirically calibrated relationship that uses the…Andrea Kunder, Brian Chaboyer·Sep 9, 2008SaveLearn
Modeling the Retention Probability of Black Holes in Globular Clusters: Kicks and RatesWe simulate black hole binary interactions to examine the probability of mergers and black hole growth and gravitational radiation signals using a specific initial distribution of masses for black…Kenneth Moody, Steinn Sigurdsson·Sep 9, 2008SaveLearn
HST observations of the quasar PKS 0637-752: equipartition electron-proton jet from the most complete spectral coverage to dateWe present new NICMOS and ACS observations of the quasar jet PKS 0637-752, and we use them, together with existing multiwavelength observations, to produce the most complete spectral coverage of the…Kushal T. Mehta, Markos Georganopoulos, Eric S. Perlman et al.·Sep 9, 2008SaveLearn
Gravitational Wave AstronomyAs several large scale interferometers are beginning to take data at sensitivities where astrophysical sources are predicted, the direct detection of gravitational waves may well be imminent. This…Kostas D. Kokkotas·Sep 9, 2008SaveLearn
The low-mass YSO CB230-A: investigating the protostar and its jet with NIR spectroscopy and Spitzer observationsA jet from the low-mass YSO CB230-A had been discovered in NIR narrow-band images. We aim to investigate the physical properties of the region from where the jet is launched. Our analysis was carried…Fabrizio Massi, Claudio Codella, Jan Brand et al.·Sep 9, 2008SaveLearn
Understanding Compact Object Formation and Natal Kicks: II. The case of XTE J1118+480In recent years, an increasing number of proper motions have been measured for Galactic X-ray binaries. When supplemented with accurate determinations of the component masses, orbital period, and…T. Fragos, B. Willems, V. Kalogera et al.·Sep 9, 2008SaveLearn
On the relationship between environment and galaxy properties in clusters of galaxiesWe study the correlation between different properties of bright (L>L*) galaxies in clusters and the environment in the Sloan Digital Sky Survey (SDSS). Samples of clusters of galaxies used in this…Hector J. Martinez, Valeria Coenda, Hernan Muriel·Sep 9, 2008SaveLearn
Highly ionized Fe X-ray lines at energies 7.7-8.6 keVFe XXV lines at 1.85 A (6.70 keV) and nearby Fe XXIV satellites have been widely used for determining the temperature of the hottest parts of solar flare and tokamak plasmas, though the spectral…K. J. H. Phillips·Sep 9, 2008SaveLearn
Robust photometric redshift determinations of gamma-ray burst afterglows at z > 2Theory suggests that about 10% of Swift-detected gamma-ray bursts (GRBs) will originate at redshifts greater than 5 yet a number of high redshift candidates may be left unconfirmed due to the lack of…P. A. Curran, R. A. M. J. Wijers, M. H. M. Heemskerk et al.·Sep 9, 2008SaveLearn
Parallax and Distance Estimates for Twelve Cataclysmic Variable StarsWe report parallax and distance estimates for twelve more cataclysmic binaries and related objects observed with the 2.4m Hiltner telescope at MDM Observatory. The final parallax accuracy is…J. R. Thorstensen, S. Lepine, M. Shara·Sep 9, 2008SaveLearn
Carriers of the mid-IR emission bands in PNe reanalysed. Evidence of a link between circumstellar and interstellar aromatic dustIt has been shown that the diversity of the aromatic emission features can be rationalized into different classes of objects, in which differences between circumstellar and interstellar matter are…C. Joblin, R. Szczerba, O. Berne et al.·Sep 9, 2008SaveLearn
An Eight-Octant Phase-Mask CoronagraphWe present numerical simulations and laboratory experiments on an eight-octant phase-mask (EOPM) coronagraph. The numerical simulations suggest that an achievable contrast for the EOPM coronagraph…N. Murakami, R. Uemura, N. Baba et al.·Sep 9, 2008SaveLearn
Searching for molecular hydrogen mid-infrared emission in the circumstellar environments of Herbig Be starsContext: Molecular hydrogen (H2) is the most abundant molecule in the circumstellar (CS) environments of young stars, and is a key element in giant planet formation. The measurement of the H2 content…C. Martin-Zaidi, E. F. van Dishoeck, J. -C. Augereau et al.·Sep 9, 2008SaveLearn
Photoevaporation of Circumstellar Disks by FUV, EUV and X-ray Radiation from the Central StarWe calculate the rate of photoevaporation of a circumstellar disk by energetic radiation (FUV, 6eV <hν<13.6eV; EUV, 13.6eV <hν<0.1keV; and Xrays, hν>0.1keV) from its central star. We focus on…Uma Gorti, David Hollenbach·Sep 9, 2008SaveLearn
The Inevitable Future of the Starless Core Barnard 68Dense, small molecular cloud cores have been identified as the direct progenitors of stars. One of the best studied examples is Barnard 68 which is considered a prototype stable, spherical gas core,…Andreas Burkert, Joao Alves·Sep 9, 2008SaveLearn
Correlations among the properties of galaxies found in a blind HI survey, which also have SDSS optical dataWe have used the Parkes Multibeam system and the Sloan Digital Sky Survey (SDSS) to assemble a sample of 195 galaxies selected originally from their HI signature to avoid biases against unevolved or…Diego A. Garcia-Appadoo, Andrew A. West, Julianne J. Dalcanton et al.·Sep 9, 2008SaveLearn
The evolution of the specific star formation rate of massive galaxies to z ~ 1.8 in the E-CDFSWe study the evolution of the star formation rate (SFR) of mid-infrared (IR) selected galaxies in the extended Chandra Deep Field South (E-CDFS). We use a combination of U-K GaBoDS and MUSYC data,…Maaike Damen, Ivo Labbe, Marijn Franx et al.·Sep 9, 2008SaveLearn