Horizontal Branch Morphology and Mass Loss in Globular ClustersThe connection between mass loss on the red giant branch (RGB) and horizontal branch (HB) morphology in globular clusters (GCs) has long been acknowledged but the mechanisms governing mass loss…Aaron Dotter·Sep 15, 2008SaveLearn
A Search for the Most Massive Galaxies. II. Structure, Environment and FormationWe study a sample of 43 early-type galaxies, selected from the SDSS because they appeared to have velocity dispersion > 350 km/s. High-resolution photometry in the SDSS i passband using HRC-ACS on…M. Bernardi, J. B. Hyde, A. Fritz et al.·Sep 15, 2008SaveLearn
SDSSJ084539.17+225728.0: the first DBZ white dwarf with a metal-rich gaseous debris discWe report the discovery of a third white dwarf hosting a gaseous debris disc, SDSSJ084539.17+225728.0. The typical double-peaked CaII 8498,8542,8662A emission lines can be modelled in terms of a…B. T. Gaensicke, D. Koester, T. R. Marsh et al.·Sep 15, 2008SaveLearn
Sharpening the Tip of the Red Giant BranchWe introduce a modified detection method for measuring the luminosity of the tip of the red giant branch (TRGB) by introducing the composite magnitude T = I - beta [(V-I)o - 1.50], where beta is the…Barry F. Madore, Violet Mager, Wendy L. Freedman·Sep 15, 2008SaveLearn
NoSOCS in SDSS. I. Sample Definition and Comparison of Mass EstimatesWe use Sloan Digital Sky Survey (SDSS) data to investigate galaxy cluster properties of systems first detected within DPOSS. With the high quality photometry of SDSS we derived new photometric…P. A. A. Lopes, R. R. de Carvalho, J. L. Kohl-Moreira et al.·Sep 15, 2008SaveLearn
On the frequency, intensity and duration of starburst episodes triggered by galaxy interactions and mergersWe investigate the intensity enhancement and the duration of starburst episodes, triggered by major galaxy interactions and mergers. To this aim, we analyze two large statistical datasets of…P. Di Matteo, F. Bournaud, M. Martig et al.·Sep 15, 2008SaveLearn
Do the photometric colors of Type II-P Supernovae allow accurate determination of host galaxy extinction?We present infrared photometry of SN 1999em, plus optical photometry, infrared photometry, and optical spectroscopy of SN 2003hn. Both objects were Type II-P supernovae. The V-[RIJHK] color curves of…Kevin Krisciunas, Mario Hamuy, Nicholas B. Suntzeff et al.·Sep 15, 2008SaveLearn
High-resolution radio observations of X-ray binariesI present an overview of important results obtained using high-resolution very long baseline interferometry (VLBI) observations of X-ray binary systems. These results derive from both astrometric…James Miller-Jones·Sep 15, 2008SaveLearn
A 600 minute near-infrared lightcurve of Sagittarius A*We present the longest, by a factor of two, near-infrared lightcurve from Sgr A* - the supermassive black hole in the Galactic center. Achieved by combining Keck and VLT data from one common night,…L. Meyer, T. Do, A. Ghez et al.·Sep 15, 2008SaveLearn
Tombaugh 2: The First Open Cluster with a Significant Abundance Spread or Embedded in a Cold Stellar Stream?We present new abundances and radial velocities for stars in the field of the open cluster Tombaugh 2, which has been suggested to be associated with the Galactic Anticenter Stellar Structure (also…P. M. Frinchaboy, A. F. Marino, S. Villanova et al.·Sep 15, 2008SaveLearn
A linear filter to reconstruct the ISW effect from CMB and LSS observationsThe extraction of a signal from some observational data sets that contain different contaminant emissions, often at a greater level than the signal itself, is a common problem in Astrophysics and…R. B. Barreiro, P. Vielva, C. Hernandez-Monteagudo et al.·Sep 15, 2008SaveLearn
The 15--43-GHz Parsec-scale Circular Polarization of 41 Active Galactic NucleiWe present the results of parsec-scale circular polarization (CP) measurements based on VLBA data for a number of radio-bright, core-dominated AGN obtained simultaneously at 15, 22 and 43 GHz. The…V. M. Vitrishchak, D. C. Gabuzda, E. A. Rastorgueva et al.·Sep 15, 2008SaveLearn
Cosmological perturbations from multi-field inflationWe briefly review the standard derivation of the spectra of cosmological perturbations in the simplest models of inflation. We then consider models with several scalar fields, described by…David Langlois·Sep 15, 2008SaveLearn
Shock heating in the group atmosphere of the radio galaxy B2 0838+32AWe present Chandra and radio observations, and analysis of Sloan Digital Sky Survey data, of the radio galaxy B2 0838+32A (4C 32.26) and its environment. The radio galaxy is at the centre of a nearby…Nazirah N. Jetha, Martin J. Hardcastle, Trevor J. Ponman et al.·Sep 15, 2008SaveLearn
Extragalactic Constraints on the Initial Mass FunctionThe local stellar mass density is observed to be significantly lower than the value obtained from integrating the cosmic star formation history (SFH), assuming that all the stars formed with a…Stephen M. Wilkins, Andrew M. Hopkins, Neil Trentham et al.·Sep 15, 2008SaveLearn
High redshift quasars in the COSMOS survey: the space density of z>3 X-ray selected QSOsWe present a new measurement of the space density of high redshift (3.0<z<4.5), X-ray selected QSOs obtained by exploiting the deep and uniform multiwavelength coverage of the COSMOS survey. We have…M. Brusa, A. Comastri, R. Gilli et al.·Sep 15, 2008SaveLearn
On the chemical evolution of the Milky WayI discuss three different topics concerning the chemical evolution of the Milky Way (MW). 1) The metallicity distribution of the MW halo; it is shown that this distribution can be analytically…N. Prantzos·Sep 15, 2008SaveLearn
SPITZER survey of dust grain processing in stable discs around binary post-AGB starsAims: We investigate the mineralogy and dust processing in the circumbinary discs of binary post-AGB stars using high-resolution TIMMI2 and SPITZER infrared spectra. Methods: We perform a full…C. Gielen, H. Van Winckel, M. Min et al.·Sep 15, 2008SaveLearn
A cosmic-ray precursor model for a Balmer-dominated shock in Tycho's supernova remnantWe present a time-dependent cosmic-ray modified shock model for which the calculated H-alpha emissivity profile agrees well with the H-alpha flux increase ahead of the Balmer-dominated shock at knot…A. Y. Wagner, J. -J. Lee, J. C. Raymond et al.·Sep 15, 2008SaveLearn
The Magellanic system X-ray sourcesUsing archival X-ray data from the second XMM-Newton serendipitous source catalogue, we present comparative analysis of the overall population of X-ray sources in the Large and Small Magellanic…Andrew J. Gosling, Sean A. Farrell, Natalie A. Webb et al.·Sep 15, 2008SaveLearn
The old Galactic open clusters FSR1716 and Czernik23Open clusters older than 4 Gyr are rare in the Galaxy. Affected by a series of mass-decreasing processes, the stellar content of most open clusters dissolves into the field in a time-scale…Charles Bonatto, Eduardo Bica·Sep 15, 2008SaveLearn
On the 511 keV emission line of positron annihilation in the Milky WayI review our current understanding of positron sources in the Galaxy, on the basis of the reported properties of the observed 511 keV annihilation line. It is argued here that most of the disk…N. Prantzos·Sep 15, 2008SaveLearn
Morphology of galaxies in the Coma cluster region down to MB=-14.25. I. A catalog of 473 membersThis paper presents morphological type, membership, and U-V color for a sample of galaxies in the Coma cluster direction, complete down to MB=-15.00 mag and extending down to MB=-14.25 mag. We have…R. Michard, S. Andreon·Sep 15, 2008SaveLearn
Dynamical Simulations of NGC 2523 and NGC 4245We present dynamical simulations of NGC 2523 and NGC 4245, two barred galaxies (types SB(r)b and SB(r)0/a, respectively) with prominent inner rings. Our goal is to estimate the bar pattern speeds in…P. Treuthardt, H. Salo, R. Buta·Sep 15, 2008SaveLearn
On the spin distributions of ΛCDM haloesWe used merger trees realizations, predicted by the extended Press-Schechter theory, in order to study the growth of angular momentum of dark matter haloes. Our results showed that: 1) The spin…N. Hiotelis·Sep 15, 2008SaveLearn