The formation of compact massive self-gravitating discs in metal-free haloes with virial temperatures of ~ 13000-30000 KWe have used the hydrodynamical AMR code ENZO to investigate the dynamical evolution of the gas at the centre of dark matter haloes with virial velocities of ~ 20 - 30 kms and virial temperatures of…John A. Regan, Martin G. Haehnelt·Sep 30, 2008SaveLearn
Detection of a Temperature Inversion in the Broadband Infrared Emission Spectrum of TrES-4We estimate the strength of the bandpass-integrated thermal emission from the extrasolar planet TrES-4 at 3.6, 4.5, 5.8, and 8.0 micron using the Infrared Array Camera (IRAC) on the Spitzer Space…Heather A. Knutson, David Charbonneau, Adam Burrows et al.·Sep 30, 2008SaveLearn
Ion Temperatures in the Low Solar Corona: Polar Coronal Holes at Solar MinimumIn the present work we use a deep-exposure spectrum taken by the SUMER spectrometer in a polar coronal hole in 1996 to measure the ion temperatures of a large number of ions at many different heights…Enrico Landi, Steven R. Cranmer·Sep 30, 2008SaveLearn
The Mid-Infrared [SIV]/[NeII] versus [NeIII]/[NeII] CorrelationThe mid-infrared ratio [NeIII]15.6mum/[NeII]12.8mum is a strong diagnostic of the ionization state of emission line objects, due to its use of only strong neon emission lines only weakly affected by…Brent Groves, Bas Nefs, Bernhard Brandl·Sep 30, 2008SaveLearn
Discovery of High-Energy Gamma-Ray Pulsations from PSR J2021+3651 with AGILEDiscovered after the end of the Compton Gamma-Ray Observatory mission, the radio pulsar PSR J2021+3651 was long considered a likely counterpart of the high-energy gamma-ray source 2CG 075+00 = 3EG…J. P. Halpern, F. Camilo, A. Giuliani et al.·Sep 30, 2008SaveLearn
Column Densities Towards Three Bursting Low-Mass X-ray Binaries from High Resolution X-ray SpectroscopyWe measured the galactic hydrogen column densities to the neutron-star binaries GX 17+2, 4U 1705-44, and 4U 1728-34 by modeling the Mg and Si absorption edges found in high-resolution X-ray spectra…Patricia Wroblewski, Tolga Guver, Feryal Ozel·Sep 30, 2008SaveLearn
Star Clusters in M31: I. A Catalog and a Study of the Young ClustersWe present an updated catalog of 1300 objects in the field of M31, including 670 likely star clusters of various types. Archival images were inspected to confirm cluster classifications where…Nelson Caldwell, Paul Harding, Heather Morrison et al.·Sep 30, 2008SaveLearn
Discovery, photometry, and astrometry of 49 classical nova candidates in M81 galaxyThis paper reports on a search for new classical nova candidates in the M81 galaxy based on archival, as well as recent, new images. We used images from 1999-2007 to search for optical transients in…K. Hornoch, P. Scheirich, P. M. Garnavich et al.·Sep 30, 2008SaveLearn
New Circumstellar Dust Creation in V838 MonocerotisWe report high spatial resolution 11.2 and 18.1 micron imaging of the eruptive variable V838 Monocerotis, obtained with Gemini Observatory's Michelle in 2007 March. The 2007 flux density of the…John P. Wisniewski, Mark Clampin, Karen S. Bjorkman et al.·Sep 30, 2008SaveLearn
The Gas Temperature of Starless Cores in PerseusIn this paper we study the determinants of starless core temperatures in the Perseus molecular cloud. We use NH3 (1,1) and (2,2) observations to derive core temperatures (Tkin) and data from the…Scott Schnee, Erik Rosolowsky, Jonathan Foster et al.·Sep 30, 2008SaveLearn
Secular dynamics of coplanar, non-resonant planetary system under the general relativity and quadrupole moment perturbationsWe construct a secular theory of a coplanar system of N-planets not involved in strong mean motion resonances, and which are far from collision zones. Besides the point-to-point Newtonian mutual…Cezary Migaszewski, Krzysztof Gozdziewski·Sep 30, 2008SaveLearn
Perspectives on Interstellar Dust Inside and Outside of the HeliosphereMeasurements by dust detectors on interplanetary spacecraft appear to indicate a substantial flux of interstellar particles with masses exceeding 10-12gram. The reported abundance of these massive…B. T. Draine·Sep 30, 2008SaveLearn
Vortices in self-gravitating disksVortices are believed to greatly help the formation of km sized planetesimals by collecting dust particles in their centers. However, vortex dynamics is commonly studied in non-self-gravitating…G. R. Mamatsashvili, W. K. M. Rice·Sep 30, 2008SaveLearn
Spectrum-Energy Correlations and Swift GRBsThe correlation between the photon energy at which the redshift corrected nFn spectrum peaks (hence called "peak energy", Ep,i) and the isotropic equivalent radiated energy (Eiso), is one of…Lorenzo Amati·Sep 30, 2008SaveLearn
Spectral modeling of gaseous metal disks around DAZ white dwarfsWe report on our attempt for the first non-LTE modeling of gaseous metal disks around single DAZ white dwarfs recently discovered by Gaensicke et al. and thought to originate from a disrupted…K. Werner, T. Nagel, T. Rauch·Sep 30, 2008SaveLearn
The Quintuplet Cluster I. A K-band spectral catalog of stellar sourcesThree very massive clusters are known to reside in the Galactic Center region, the Arches cluster, the Quintuplet cluster and the Central parsec cluster. We obtained spectroscopic observations of the…A. Liermann, W. -R. Hamann, L. M. Oskinova·Sep 30, 2008SaveLearn
Hydrodynamics of interaction of pulsar and stellar winds and its impact on the high energy radiation of binary pulsar systemsThe hydrodynamics of the interaction of pulsar and stellar winds in binary systems harboring a pulsar and its impact on the nonthermal radiation of the binary pulsar PSR B1259-63/SS2883 is discussed.…D. V. Khangulyan, F. A. Aharonian, S. V. Bogovalov et al.·Sep 30, 2008SaveLearn
Ram-pressure stripped molecular gas in the Virgo spiral galaxy NGC 4522IRAM 30m 12CO(1-0) and 12CO(2-1) HERA observations are presented for the ram-pressure stripped Virgo spiral galaxy NGC 4522. The CO emission is detected in the galactic disk and the extraplanar gas.…B. Vollmer, J. Braine, C. Pappalardo et al.·Sep 30, 2008SaveLearn
The Gamma--Ray Burst catalog obtained with the Gamma Ray Burst Monitor aboard BeppoSAXWe report on the catalog of Gamma--Ray Bursts (GRBs) detected with the Gamma Ray Burst Monitor aboard the BeppoSAX satellite. It includes 1082 GRBs with 40--700 keV fluences in the range from…F. Frontera, C. Guidorzi, E. Montanari et al.·Sep 30, 2008SaveLearn
Detection of Hot Gas in Galaxy Groups via the Sunyaev-Zel'dovich EffectMotivated by the observed shortfall of baryons in the local universe, we investigate the ability of high resolution cosmic microwave background (CMB) experiments to detect hot gas in the outer…K. Moodley, R. Warne, N. Goheer et al.·Sep 30, 2008SaveLearn
RAVE- First Results and Second Data ReleaseRAVE, the RAdial Velocity Experiment, is an ambitious program to conduct a survey to measure the radial velocities, metallicities and abundance ratios for up to a million stars using the 1.2-m UK…A. Siebert, the RAVE collaboration·Sep 30, 2008SaveLearn
Sigma-drop in galaxies and the sigma-metallicity degeneracyIn some galaxies, the central velocity dispersion, sigma, is depressed with respect to the surroundings. This sigma-drop phenomenon may have different physical origins, bearing information about the…Mina Koleva, Philippe Prugniel, Sven De Rijcke·Sep 30, 2008SaveLearn
A Constraint on brown dwarf formation via ejection: radial variation of the stellar and substellar mass function of the young open cluster IC2391Using the Wide Field Imager (WFI) at the ESO 2.2m telescope at La Silla and the CPAPIR camera at the CTIO 1.5m telescope at Cerro Tololo, we have performed an extensive, multiband photometric survey…S. Boudreault, C. A. L. Bailer-Jones·Sep 30, 2008SaveLearn
Chemically peculiar stars and their temperature calibrationThe determination of effective temperature for chemically peculiar (CP) stars by means of photometry is a sophisticated task due to their abnormal colours. Standard calibrations for normal stars lead…M. Netopil, E. Paunzen, H. M. Maitzen et al.·Sep 30, 2008SaveLearn
Extended Limber ApproximationWe develop a systematic derivation for the Limber approximation to the angular cross-power spectrum of two random fields, as a series expansion in 1/(+1/2). This extended Limber approximation can…Marilena LoVerde, Niayesh Afshordi·Sep 30, 2008SaveLearn