Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Max Planck SocietyDE1.2k papers
- Centre National de la Recherche ScientifiqueFR1k papers
- National Institute for AstrophysicsIT820 papers
- European Southern ObservatoryCL784 papers
- Center for Astrophysics Harvard & SmithsonianUS755 papers
- Max Planck Institute for Extraterrestrial PhysicsDE722 papers
- Ludwig-Maximilians-Universität MünchenDE639 papers
- Space Research InstituteRU602 papers
- Osservatorio Astronomico di PadovaIT600 papers
- California Institute of TechnologyUS581 papers
- Trieste Astronomical ObservatoryIT566 papers
- University of California, BerkeleyUS566 papers
26 papers · 2 filters
On the alleged duality of the Galactic halo
Ralph Schoenrich, Martin Asplund, Luca Casagrande
We examine the kinematics of the Galactic halo based on SDSS/SEGUE data by Carollo et al. (2007, 2010). We find that their claims of a counter-rotating halo are the result of subst…
On the nature of the break in the X-ray luminosity function of low-mass X-ray binaries
M. Revnivtsev, K. Postnov, A. Kuranov +1
We analyze a flux-limited sample of persistent and bright (with 2-10 keV fluxes exceeding 1.4e-10 erg/s/cm2) low-mass X-ray binaries (LMXBs) in our Galaxy. It is demonstrated that…
Galactic ménage à trois: Simulating magnetic fields in colliding galaxies
H. Kotarba, H. Lesch, K. Dolag +4
We present high resolution simulations of a multiple merger of three disk galaxies including the evolution of magnetic fields performed with the N-body/SPH code Gadget. For the fir…
Massive black holes in stellar systems: 'quiescent' accretion and luminosity
Marta Volonteri, Massimo Dotti, Duncan Campbell +1
Only a small fraction of local galaxies harbor an accreting black hole, classified as an active galactic nucleus (AGN). However, many stellar systems are plausibly expected to host…
A Two-Point Correlation Function For Galactic Halo Stars
A. P. Cooper, S. Cole, C. S. Frenk +1
We describe a correlation function statistic that quantifies the amount of spatial and kinematic substructure in the stellar halo. We test this statistic using model stellar halo r…
Binaries migrating in a gaseous disk: Where are the Galactic center binaries?
C. Baruteau, J. Cuadra, D. N. C. Lin
The massive stars in the Galactic center inner arcsecond share analogous properties with the so-called Hot Jupiters. Most of these young stars have highly eccentric orbits, and wer…
Dynamics of the Magellanic Clouds in a LCDM Universe
Michael Boylan-Kolchin, Gurtina Besla, Lars Hernquist
We examine Milky Way-Magellanic Cloud systems selected from the Millennium-II Simulation in order to place the orbits of the Magellanic Clouds in a cosmological context. Our analys…
Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. III. Detection of lithium in the metal-poor bulge dwarf MOA-2010-BLG-285S
T. Bensby, M. Asplund, J. A. Johnson +8
Context: In order to study the evolution of Li in the Galaxy it is necessary to observe dwarf or subgiant stars. Abridged Although Li has been extensively studied in the Galactic d…
X-ray and radio variability in the low luminosity Active Galactic Nucleus NGC 7213
M. E. Bell, T. Tzioumis, P. Uttley +7
We present the results of a ~ 3 year campaign to monitor the low luminosity active galactic nucleus (LLAGN) NGC 7213 in the radio (4.8 and 8.4 GHz) and X-ray bands (2-10 keV). With…
Local stars formed at z>10: a sample extracted from the SDSS
Luca Sbordone, Piercarlo Bonifacio, Elisabetta Caffau +1
As the Universe emerged from its initial hot and dense phase, its chemical composition was extremely simple, being limited to stable H and He isotopes, and traces of Li. The first…
The lithium content of omega Centauri. New clues to the cosmological Li problem from old stars in external galaxies
L. Monaco, P. Bonifacio, L. Sbordone +2
A discrepancy has emerged between the cosmic lithium abundance inferred by the WMAP satellite measurement coupled with the prediction of the standard big-bang nucleosynthesis theor…
Abundances for a large sample of red giants in NGC 1851: hints for a merger of two clusters?
E. Carretta, R. G. Gratton, S. Lucatello +8
We present the abundance analysis of a sample of more than 120 red giants in the globular cluster (GC) NGC 1851, based on FLAMES spectra. We find a small but detectable metallicity…
X-shooter observations of main sequence stars in the globular cluster NGC 2808: first chemical tagging of a He-normal and a He-rich dwarf
A. Bragaglia, E. Carretta, R. G. Gratton +7
We present the first chemical composition study of two unevolved stars in the globular cluster NGC 2808, obtained with the spectrograph X-shooter@VLT. NGC 2808 shows three discrete…
The structure of gravitationally unstable gas-rich disk galaxies
Michael Aumer, Andreas Burkert, Peter H. Johansson +1
We use a series of idealized, numerical SPH simulations to study the formation and evolution of galactic, gas-rich disks forming from gas infall within dark matter halos. The tempe…
On the radial distribution of stars of different stellar generations in the globular cluster NGC 3201
Eugenio Carretta, Angela Bragaglia, Valentina D'Orazi +2
We study the radial distribution of stars of different stellar generations in the globular cluster NGC 3201. From recently published multicolour photometry, a radial dependence of…
The Galactic Centre star S2 as a dynamical probe for intermediate-mass black holes
Alessia Gualandris, Stefan Gillessen, David Merritt
We study the short-term effects of an intermediate mass black hole (IBH) on the orbit of star S2 (S02), the shortest-period star known to orbit the supermassive black hole (MBH) in…
Helium in first and second-generation stars in Globular Clusters from spectroscopy of red giants
Angela Bragaglia, Eugenio Carretta, Raffaele Gratton +3
(abridged) Recent spectroscopic and photometric observations show the existence of various generations of stars in GCs, differing in the abundances of products of H-burning at high…
Manganese Abundances in the Globular Cluster Omega Centauri
Katia Cunha, Verne V. Smith, Maria Bergemann +2
We present manganese abundances in 10 red-giant members of the globular cluster Omega Centauri; 8 stars are from the most metal-poor population (RGB MP and RGB MInt1) while two tar…
On the evolution of the intrinsic scatter in black hole versus galaxy mass relations
M. Hirschmann, S. Khochfar, A. Burkert +3
We present results on the evolution of the intrinsic scatter of black hole masses considering different implementations of a model in which black holes only grow via mergers. We de…
Dynamical constraints on the origin of the young B-stars in the Galactic center
Hagai B. Perets, Alessia Gualandris
Regular star formation is thought to be inhibited close to the massive black hole (MBH) in the Galactic center. Nevertheless, tens of young main sequence B stars have been observed…
Sulphur abundances in halo stars from Multiplet 3 at 1045 nm
Elisabetta Caffau, Luca Sbordone, Hans-Günter Ludwig +2
Sulphur is a volatile alpha-element which is not locked into dust grains in the interstellar medium (ISM). Hence, its abundance does not need to be corrected for dust depletion whe…
Absorption-line probes of the prevalence and properties of outflows in present-day star-forming galaxies
Yan-Mei Chen, Christy A. Tremonti, Timothy M. Heckman +4
We analyze star forming galaxies drawn from SDSS DR7 to show how the interstellar medium (ISM) Na I 5890, 5896 (Na D) absorption lines depend on galaxy physical properties, and to…
The metal-poor end of the Spite plateau. 1: Stellar parameters, metallicities and lithium abundances
L. Sbordone, P. Bonifacio, E. Caffau +16
We present VLT-UVES Li abundances for 28 halo dwarf stars between [Fe/H]=-2.5 and -3.5, 10 of which have [Fe/H]<-3. Four different T_eff scales have been used. Direct Infrared Flux…
Unresolved X-ray emission in M31 and constraints on progenitors of Classical Novae
Akos Bogdan, Marat Gilfanov
We investigate unresolved X-ray emission from M31 based on an extensive set of archival XMM-Newton and Chandra data. We show that extended emission, found previously in the bulge a…