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19922026
Showing 2015Show all

263 papers · 1 filter

nucl-ex2015★ 78 cited

Precision Mass Measurements of 129-131Cd and Their Impact on Stellar Nucleosynthesis via the Rapid Neutron Capture Process

D. Atanasov, P. Ascher, K. Blaum +17

Masses adjacent to the classical waiting-point nuclide 130Cd have been measured by using the Penning- trap spectrometer ISOLTRAP at ISOLDE/CERN. We find a significant deviation of…

astro-ph.SR2015★ 59 cited

The treatment of mixing in core helium burning models -- II. Constraints from cluster star counts

Thomas Constantino, Simon W. Campbell, John C. Lattanzio +1

The treatment of convective boundaries during core helium burning is a fundamental problem in stellar evolution calculations. In Paper~I we showed that new asteroseismic observatio…

astro-ph.SR2015★ 7 cited

Towards 21st Century Stellar Models: Star Clusters, Supercomputing, and Asteroseismology

S. W. Campbell, T. N. Constantino, V. D'Orazi +8

Stellar models provide a vital basis for many aspects of astronomy and astrophysics. Recent advances in observational astronomy -- through asteroseismology, precision photometry, h…

astro-ph.IM2015★ 41 cited

A Jacobian-free Newton-Krylov method for time-implicit multidimensional hydrodynamics

Maxime Viallet, Tom Goffrey, Isabelle Baraffe +5

This work is a continuation of our efforts to develop an efficient implicit solver for multidimensional hydrodynamics for the purpose of studying important physical processes in st…

astro-ph.CO2015★ 89 cited

The XXL Survey IV. Mass-temperature relation of the bright cluster sample

Maggie Lieu, Graham P. Smith, Paul A. Giles +18

The XXL survey is the largest survey carried out by XMM-Newton. Covering an area of 50deg, the survey contains galaxy clusters out to a redshift 2 and to an X-r…

astro-ph.GA2015★ 11 cited

Tomography of the Galactic free electron density with the Square Kilometer Array

Maksim Greiner, Dominic H. F. M. Schnitzeler, Torsten A. Ensslin

We present a new algorithm to reconstruct the Galactic free electron density from pulsar dispersion measures. The algorithm performs a nonparametric tomography for a density field…

astro-ph.GA2015★ 12 cited

Kinematic Dynamo, Supersymmetry Breaking, and Chaos

Igor V. Ovchinnikov, Torsten Enßlin

The kinematic dynamo (KD) describes the growth of magnetic fields generated by the flow of a conducting medium in the limit of vanishing backaction of the fields onto the flow. The…

astro-ph.CO2015★ 31 cited

Structures and components in galaxy clusters: observations and models

A. M. Bykov, E. M. Churazov, C. Ferrari +5

Clusters of galaxies are the largest gravitationally bounded structures in the Universe dominated by dark matter. We review the observational appearance and physical models of plas…

astro-ph.SR2015★ 14 cited

Quantitative spectral analysis of the sdB star HD 188112: a helium-core white dwarf progenitor

M. Latour, U. Heber, A. Irrgang +7

HD 188112 is a bright (V = 10.2 mag) hot subdwarf B (sdB) star with a mass too low to ignite core helium burning and is therefore considered as a pre-extremely low mass (ELM) white…

astro-ph.SR2015★ 84 cited

Searching for swept-up Hydrogen and Helium in the late-time spectra of 11 nearby Type Ia supernovae

Kate Maguire, Stefan Taubenberger, Mark Sullivan +1

The direct detection of a stellar system that explodes as a Type Ia supernova (SN Ia) has not yet been successful. Various indirect methods have been used to investigate SN Ia prog…

astro-ph.SR2015★ 34 cited

Exploring the spectroscopic diversity of type Ia supernovae with DRACULA: a machine learning approach

Michele Sasdelli, E. E. O. Ishida, R. Vilalta +8

The existence of multiple subclasses of type Ia supernovae (SNeIa) has been the subject of great debate in the last decade. One major challenge inevitably met when trying to infer…

gr-qc2015★ 173 cited

Explosion and final state of an unstable Reissner-Nordstrom black hole

Nicolas Sanchis-Gual, Juan Carlos Degollado, Pedro J. Montero +2

A Reissner-Nordström black hole (BH) is superradiantly unstable against spherical perturbations of a charged scalar field, enclosed in a cavity, with frequency lower than a critica…

astro-ph.CO2015★ 30 cited

Lagrangian bias of generic large-scale structure tracers

Titouan Lazeyras, Marcello Musso, Vincent Desjacques

The dark matter halos that host galaxies and clusters form out of initial high-density patches, providing a biased tracer of the linear matter density field. In the simplest local…

astro-ph.GA2015★ 26 cited

The discovery of lensed radio and X-ray sources behind the Frontier Fields cluster MACS J0717.5+3745 with the JVLA and Chandra

R. J. van Weeren, G. A. Ogrean, C. Jones +24

We report on high-resolution JVLA and Chandra observations of the HST Frontier Cluster MACS J0717.5+3745. MACS J0717.5+3745 offers the largest contiguous magnified area of any know…

astro-ph.SR2015★ 44 cited

Shear mixing in stellar radiative zones - II. Robustness of numerical simulations

Vincent Prat, Jérôme Guilet, Maxime Viallet +1

Recent numerical simulations suggest that the model by Zahn (1992, A&A, 265, 115) for the turbulent mixing of chemical elements due to differential rotation in stellar radiative zo…

astro-ph.GA2015★ 54 cited

On the stellar halo metallicity profile of Milky Way-like galaxies in the Auriga simulations

Antonela Monachesi, Facundo A. Gomez, Robert J. J. Grand +5

A recent observational study of haloes of nearby Milky Way-like galaxies shows that only half (four out of eight) of the current sample exhibits strong negative metallicity ([Fe/H]…

astro-ph.GA2015★ 179 cited

Vertical disc heating in Milky Way-sized galaxies in a cosmological context

Robert J. J. Grand, Volker Springel, Facundo A. Gómez +4

Vertically extended, high velocity dispersion stellar distributions appear to be a ubiquitous feature of disc galaxies, and both internal and external mechanisms have been proposed…

astro-ph.HE2015★ 66 cited

Radio observations of a sample of broad-lined type Ic supernovae discovered by PTF/iPTF: A search for relativistic explosions

A. Corsi, A. Gal-Yam, S. R. Kulkarni +15

Long duration gamma-ray bursts are a rare subclass of stripped-envelope core-collapse supernovae that launch collimated relativistic outflows (jets). All gamma-ray-burst-associated…

astro-ph.GA2015★ 20 cited

The galaxy correlation function as a constraint on galaxy formation physics

Marcel P. van Daalen, Bruno M. B. Henriques, Raul E. Angulo +1

We introduce methods which allow observed galaxy clustering to be used together with observed luminosity or stellar mass functions to constrain the physics of galaxy formation. We…

astro-ph.HE2015★ 94 cited

Type II supernova energetics and comparison of light curves to shock-cooling models

Adam Rubin, Avishay Gal-Yam, Annalisa De Cia +37

During the first few days after explosion, Type II supernovae (SNe) are dominated by relatively simple physics. Theoretical predictions regarding early-time SN light curves in the…

astro-ph.EP2015★ 53 cited

Imaging Jupiter's radiation belts down to 127 MHz with LOFAR

J. N. Girard, P. Zarka, C. Tasse +71

Context. Observing Jupiter's synchrotron emission from the Earth remains today the sole method to scrutinize the distribution and dynamical behavior of the ultra energetic electron…

astro-ph.GA2015★ 90 cited

The 31 Deg Release of the Stripe 82 X-ray Survey: The Point Source Catalog

Stephanie M. LaMassa, C. Megan Urry, Nico Cappelluti +23

We release the next installment of the Stripe 82 X-ray survey point-source catalog, which currently covers 31.3 deg of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy fiel…

astro-ph.HE2015★ 1 cited

GeV excess and phenomenological astrophysics modeling

Xiaoyuan Huang, Torsten Enßlin, Marco Selig

Predefined spatial templates to describe the background of -ray emission from astrophysical processes, like cosmic ray interactions, are used in previous searches for the -ra…

astro-ph.SR2015★ 10 cited

Theory of stellar convection II: first stellar models

S. Pasetto, C. Chiosi, E. Chiosi +2

We present here the first stellar models on the Hertzsprung-Russell diagram (HRD), in which convection is treated according to the novel scale-free convection theory (SFC theory) b…