Parameters of Herbig Ae/Be and Vega-type starsThis work presents the determination of the effective temperature, gravity, metallicity, mass, luminosity and age of 27 young early-type stars, most of them in the age range 1-10 Myr, and three…Benjamin Montesinos, Carlos Eiroa, Alcione Mora et al.·Nov 21, 2008SaveLearn
Explanation of the activity sensitivity of Mn I 5394.7 ÅThere is a long-standing controversy concerning the reason why the Mn I 5394.7 A line in the solar irradiance spectrum brightens more at larger activity than most other photospheric lines. The claim…N. Vitas, B. Viticchiè, R. J. Rutten et al.·Nov 21, 2008SaveLearn
Three Dimensional Line Transfer Study of Energy Sources in Compact Molecular Gas in Active Galaxies -- AGN/Starburst Connection --Recent observations suggest molecular line ratios in millimeter and submillimeter bands may be a good tool to reveal the long-standing question on the origin of energy sources in obscured active…Masako Yamada, Wada Keiichi, Kohji Tomisaka·Nov 21, 2008SaveLearn
Galaxy systems in the optical and infraredIn these three lectures a review is provided of the properties of galaxy systems as determined from optical and infrared measurements. Covered topics are: clusters identification, global cluster…A. Biviano·Nov 21, 2008SaveLearn
Dark matter and dark energy proposals: maintaining cosmology as a true science?I consider the relation of explanations for the observed data to testability in the following contexts: observational and experimental detection of dark matter; observational and experimental…George F. R. Ellis·Nov 21, 2008SaveLearn
3D spectroscopy of candidate double-barred lenticular galaxiesSignificant fraction of barred galaxies hosts secondary bar-like structures on optical and NIR images. The circumnuclear dynamics of double-barred objects are still not well understood, observational…A. V. Moiseev·Nov 21, 2008SaveLearn
Status of indirect searches in the PAMELA and Fermi eraThe detection of gamma-rays, antiprotons and positrons due to pair annihilation of dark matter particles in the Milky Way halo is a viable indirect technique to search for signatures of…Aldo Morselli, Igor V. Moskalenko·Nov 21, 2008SaveLearn
Carbon and Nitrogen Abundances in Early-type GalaxiesFor the first time, we undertake a systematic examination of the nitrogen abundances for a sample of 35 early-type galaxies spanning a range of masses and local environment. The nitrogen-sensitive…Elisa Toloba, Patricia Sanchez-Blazquez, Javier Gorgas et al.·Nov 21, 2008SaveLearn
Gas Phase diagnostics of Protoplanetary disk extensionWe investigate the potential of using ratios of fine structure and near-infrared forbidden line transitions of atomic carbon to diagnose protoplanetary disk extension. Using results from 2D…B. Ercolano, J. J. Drake, C. J. Clarke·Nov 21, 2008SaveLearn
Is the ejection of the corona a general phenomenon in microquasars?We study the evolution of some microquasars during their outbursts as observed with the X-ray telescopes RXTE and INTEGRAL. We focus on the interplay between the accretion disc, and the medium…Jerome Rodriguez, Lionel Prat·Nov 21, 2008SaveLearn
Clues to unveil the emitter in LS 5039: powerful jets vs colliding windsLS 5039 is among the most interesting VHE sources in the Galaxy. Two scenarios have been put forward to explain the observed TeV radiation: jets vs pulsar winds. The source has been detected during…V. Bosch-Ramon, D. Khangulyan, F. A. Aharonian·Nov 21, 2008SaveLearn
The origin of abundance gradients in the Milky Way: the predictions of different modelsWe aim at studying the abundance gradients along the Galactic disk and their dependence upon several parameters: a threshold in the surface gas density regulating star formation, the star formation…E. Colavitti, G. Cescutti, F. Matteucci et al.·Nov 21, 2008SaveLearn
Merger of Massive Black Holes using N-Body Simulations with Post-Newtonian CorrectionsWe present preliminary results from self-consistent, high resolution direct N-body simulations of massive black hole binaries in mergers of galactic nuclei. The dynamics of the black hole…Miguel Preto, Ingo Berentzen, Peter Berczik et al.·Nov 21, 2008SaveLearn
New light on the driving mechanism in roAp stars. Part I. Effects of metallicityObservations suggest that a relationship exists between the driving mechanism of roAp star pulsations and the heavy element distribution in these stars. We attempt to study the effects of local and…S. Théado, M. -A. Dupret, A. Noels et al.·Nov 21, 2008SaveLearn
An ecological approach to problems of Dark Energy, Dark Matter, MOND and NeutrinosModern astronomical data on galaxy and cosmological scales have revealed powerfully the existence of certain dark sectors of fundamental physics, i.e., existence of particles and fields outside the…HongSheng Zhao·Nov 21, 2008SaveLearn
Extended Lyman Alpha Nebulae at z ~ 2.3: An Extremely Rare and Strongly Clustered Population?To obtain an unbiased sample of bright LyA blobs [L(LyA) > 1043 ergs/s], we have undertaken a blind, wide-field, narrow-band imaging survey in the NOAO Deep Wide Field Survey Bootes field with the…Yujin Yang, Ann Zabludoff, Christy Tremonti et al.·Nov 21, 2008SaveLearn
Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode)Twisting motions of different nature are observed in several layers of the solar atmosphere. Chromospheric sunspot whorls and rotation of sunspots or even higher up in the lower corona sigmoids are…R. Attie, D. E. Innes, H. E. Potts·Nov 21, 2008SaveLearn
Helioseismic data inclusion in solar dynamo modelsAn essential ingredient in kinematic dynamo models is the velocity field within the solar convection zone. In particular, the differential rotation is now well constrained by helioseismic…Andrés Muñoz-Jaramillo, Dibyendu Nandy, Petrus C. H. Martens·Nov 20, 2008SaveLearn
Radiation pressure force and black hole mass determination in low redshift type-I and type-II active galactic nucleiThe distributions of L(oiii 5007), black hole (BH) mass and L/L(Edd) in two large samples of type-I and type-II active galactic nuclei (AGNs) are compared in order to test the suggestion that…Hagai Netzer·Nov 20, 2008SaveLearn
Generation of Magnetic Fields by the Stationary Accretion Shock InstabilityWe begin an exploration of the capacity of the stationary accretion shock instability (SASI) to generate magnetic fields by adding a weak, stationary, and radial (but bipolar) magnetic field, and in…Eirik Endeve, Christian Y. Cardall, Reuben D. Budiardja et al.·Nov 20, 2008SaveLearn
Decaying Hidden Gauge Boson and the PAMELA and ATIC/PPB-BETS AnomaliesWe show that the PAMELA anomaly in the positron fraction as well as the ATIC/PPB-BETS excesses in the e- + e+ flux are simultaneously explained in our scenario that a hidden U(1)H gauge boson…Chuan-Ren Chen, Mihoko M. Nojiri, Fuminobu Takahashi et al.·Nov 20, 2008SaveLearn
On the detection of Lorentzian profiles in a power spectrum: A Bayesian approach using ignorance priorsAims. Deriving accurate frequencies, amplitudes, and mode lifetimes from stochastically driven pulsation is challenging, more so, if one demands that realistic error estimates be given for all model…M. Gruberbauer, T. Kallinger, W. W. Weiss et al.·Nov 20, 2008SaveLearn
GRB optical afterglow and redshift selection effects: The learning curve effect at workWe show how the observed gamma ray burst (GRB) optical afterglow (OA) and redshift distributions are changing in time from selection effects. For a subset of Swift triggered long duration…D. M. Coward·Nov 20, 2008SaveLearn
Image Slicer Performances from a Demonstrator for the SNAP/JDEM Mission - Part I: Wavelength AccuracyA well-adapted visible and infrared spectrograph has been developed for the SNAP (SuperNova/Acceleration Probe) experiment proposed for JDEM. The instrument should have a high sensitivity to see…M-H. Aumeunier, A. Ealet, E. Prieto et al.·Nov 20, 2008SaveLearn
Star Formation and Molecular Clouds at High Galactic LatitudeIn this chapter we review the young stars and molecular clouds found at high Galactic latitudes (|b| 30). These are mostly associated with two large-scale structures on the sky, the Gould…Peregrine M. McGehee·Nov 20, 2008SaveLearn