Galactic Rotation Curve and the Effect of Density Waves from Data on Young ObjectsBased on currently available data on the three-dimensional field of space velocities of young (<50 Myr) open star clusters and the radial velocities of HI clouds and star-forming (HII) regions, we…V. V. Bobylev, A. T. Bajkova, A. S. Stepanishchev·Oct 1, 2008SaveLearn
Galactic abundance gradients from Cepheids : On the iron abundance gradient around 10-12 kpcContext: Classical Cepheids can be adopted to trace the chemical evolution of the Galactic disk since their distances can be estimated with very high accuracy. Aims: Homogeneous iron abundance…B. Lemasle, P. Francois, A. Piersimoni et al.·Oct 1, 2008SaveLearn
The nuclear star cluster of the Milky WayThe nuclear star cluster of the Milky Way is a unique target in the Universe. Contrary to extragalactic nuclear star clusters, using current technology it can be resolved into tens of thousands of…R. Schoedel, D. Merritt, A. Eckart·Oct 1, 2008SaveLearn
High-energy emission from microqusarsIf the jets of microquasars carry a significant power in the form of relativistic hadrons, then gamma rays and neutrinos can be produced by interactions with matter and photon fields either external…Gustavo E. Romero·Oct 1, 2008SaveLearn
A Metal-biased Planet SearchWe have begun a metal-rich planet search project using the HARPS instrument in La Silla, Chile to target planets with a high potential to transit their host star and add to the number of bright…J. S. Jenkins, H. R. A. Jones, J. R. Barnes et al.·Oct 1, 2008SaveLearn
X-ray emission from dense plasma in CTTSs: Hydrodynamic modeling of the accretion shockHigh spectral resolution X-ray observations of CTTSs demonstrate the presence of plasma at T~2-3X106 K and ne~1011-1013 cm-3, unobserved in non-accreting stars. Stationary models suggest that…G. G. Sacco, C. Argiroffi, S. Orlando et al.·Oct 1, 2008SaveLearn
The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating starsThe goal of this paper is to analyze the impact of a primary neutron source on the s-process nucleosynthesis in massive stars at halo metallicity. Recent stellar models including rotation at very low…M. Pignatari, R. Gallino, G. Meynet et al.·Oct 1, 2008SaveLearn
Coordinated mm/sub-mm observations of Sagittarius A* in May 2007At the center of the Milky Way, with a distance of ~8 kpc, the compact source Sagittarius A* (SgrA*) can be associated with a super massive black hole of ~4x106 solar masses. SgrA* shows strong…D. Kunneriath, A. Eckart, S. Vogel et al.·Oct 1, 2008SaveLearn
Coordinated multi-wavelength observations of Sgr A*We report on recent near-infrared (NIR) and X-ray observations of Sagittarius A* (Sgr A*), the electromagnetic manifestation of the ~4x106 solar masses super-massive black hole (SMBH) at the…A. Eckart, R. Schoedel, F. K. Baganoff et al.·Oct 1, 2008SaveLearn
Supernova Nucleosynthesis and Extremely Metal-Poor StarsWe investigate hydrodynamical and nucleosynthetic properties of the jet-induced explosion of a population III 40M star and compare the abundance patterns of the yields with those of the…Nozomu Tominaga, Hideyuki Umeda, Keiichi Maeda et al.·Oct 1, 2008SaveLearn
The origin of 60Fe and other short-lived radionuclides in the early solar systemEstablishing the origin of short-lived radionuclides (SLRs) with half-lives ≤ 100 Myr has important implications for the astrophysical context of our Sun's birth place. We review here the…Matthieu Gounelle, Anders Meibom·Oct 1, 2008SaveLearn
Coronal properties of the EQ Peg binary systemThe activity indicators of M dwarfs are distinctly different for early and late types. The coronae of early M dwarfs display high X-ray luminosities and temperatures, a pronounced inverse FIP effect,…C. Liefke, J. -U. Ness, J. H. M. M. Schmitt et al.·Oct 1, 2008SaveLearn
Testing the blazar spectral sequence: X-ray selected blazarsWe present simultaneous optical and X-ray data from Swift for a sample of FSRQs selected from the EMSS survey. We present also a complete analysis of Swift and INTEGRAL data on 4 blazars recently…L. Maraschi, L. Foschini, G. Ghisellini et al.·Oct 1, 2008SaveLearn
VLBI observations of nearby radio loud Active Galactic NucleiWe present an update of the parsec scale properties of the Bologna Complete Sample consisting of 95 radio sources from the B2 Catalog of Radio Sources and the Third Cambridge Revised Catalog (3CR),…G. Giovannini, E. Liuzzo, M. Giroletti et al.·Oct 1, 2008SaveLearn
An evolving hot spot orbiting around Sgr A*Here we report on recent near-infrared observations of the Sgr A* counterpart associated with the super-massive ~ 4x106 Msun black hole at the Galactic Center. We find that the May 2007 flare shows…M. Zamaninasab, A. Eckart, L. Meyer et al.·Oct 1, 2008SaveLearn
Specific Angular Momentum of Disc Merger Remnants and the λR-ParameterWe use two-dimensional kinematic maps of simulated binary disc mergers to investigate the λR-parameter, which is a luminosity weighted measure of projected angular momentum per unit mass. This…Roland Jesseit, Michele Cappellari, Thorsten Naab et al.·Oct 1, 2008SaveLearn
Structured jets and VHE emission of blazars and radiogalaxiesRecent observations in the TeV band challenge the simplest models developed to describe the overall emission of blazars and radiogalaxies. In particular, the observation of variable TeV emission from…F. Tavecchio, G. Ghisellini·Oct 1, 2008SaveLearn
Neutron Scattering Facility for Characterization of CRESST and EURECA Detectors at mK TemperaturesCRESST (Cryogenic Rare Event Search with Superconducting Thermometers) is an experiment located at the Gran Sasso underground laboratory and aimed at the direct detection of dark matter in the form…J. -C. Lanfranchi, C. Ciemniak, C. Coppi et al.·Oct 1, 2008SaveLearn
Dynamical stability of strange quark starsWe show that the mass-radius (M-R) relation corresponding to the MIT bag models of strange quark matter (SQM) and the models obtained by Day et al (1998) do not provide the necessary and sufficient…P. S. Negi·Oct 1, 2008SaveLearn
Warped and eccentric discs around black holesAccretion discs around black holes in X-ray binary stars are warped if the spin axis of the black hole is not perpendicular to the binary orbital plane. They can also become eccentric through an…Gordon I. Ogilvie, Barbara T. Ferreira·Oct 1, 2008SaveLearn
Excitation of trapped oscillations in discs around black holesHigh-frequency quasi-periodic oscillations detected in the light curves of black hole candidates can, according to one model, be identified with hydrodynamic oscillations of the accretion disc. We…Barbara T. Ferreira, Gordon I. Ogilvie·Oct 1, 2008SaveLearn
A Global Energetic Model for Microquasars (GEMM): A rich and consistent disk+jet solutionBased on a dynamical model describing how stationary, powerful and self-collimated jets are being launched from a magnetized disk, we build a consistent disk+jet microquasar picture. Our disk is a…C. Foellmi, P. -O. Petrucci, J. Ferreira et al.·Oct 1, 2008SaveLearn
The gravitational wave background from super-inflation in Loop Quantum CosmologyWe investigate the behaviour of tensor fluctuations in Loop Quantum Cosmology, focusing on a class of scaling solutions which admit a near scale-invariant scalar field power spectrum. We obtain the…E. J. Copeland, D. J. Mulryne, N. J. Nunes et al.·Oct 1, 2008SaveLearn
Binarity at the L/T brown dwarf transitionCurrent atmospheric models cannot reproduce some of the characteristics of the transition between the L dwarfs with cloudy atmospheres and the T dwarfs with dust-depleted photospheres. It has been…B. Goldman, H. Bouy, M. R. Zapatero Osorio et al.·Oct 1, 2008SaveLearn
Gamma ray emission from SNR RX J1713.7-3946 and the origin of galactic cosmic raysWe calculate the flux of non-thermal radiations from the supernova remnant RX J1713.7-3946 in the context of the non-linear theory of particle acceleration at shocks, which allows us to take into…G. Morlino, E. Amato, P. Blasi·Oct 1, 2008SaveLearn