1 code implementation • 20 Nov 2019 • Anna Genina, Justin I. Read, Carlos S. Frenk, Shaun Cole, Alejandro Benitez-Llambay, Aaron D. Ludlow, Julio F. Navarro, Kyle A. Oman, Andrew Robertson
A non-parametric higher-order Jeans analysis method, GravSphere, was recently used to constrain the density profiles of Local Group dwarf galaxies, classifying them into those that are more likely to have an inner dark matter cusp and those that are likely to have a core (Read et al.).
Astrophysics of Galaxies
1 code implementation • 11 Nov 2019 • Marius Cautun, Alejandro Benitez-Llambay, Alis J. Deason, Carlos S. Frenk, Azadeh Fattahi, Facundo A. Gómez, Robert J. J. Grand, Kyle A. Oman, Julio F. Navarro, Christine M. Simpson
We provide a best-fitting contracted NFW halo model to the MW rotation curve that matches the data very well.
Astrophysics of Galaxies
2 code implementations • 24 Oct 2018 • Alexander H. Riley, Azadeh Fattahi, Andrew B. Pace, Louis E. Strigari, Carlos S. Frenk, Facundo A. Gómez, Robert J. J. Grand, Federico Marinacci, Julio F. Navarro, Rüdiger Pakmor, Christine M. Simpson, Simon D. M. White
We analyse the orbital kinematics of the Milky Way (MW) satellite system utilizing the latest systemic proper motions for 38 satellites based on data from $Gaia$ Data Release 2.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 25 Jul 2017 • Alejandro Benitez-Llambay, Julio F. Navarro, Carlos S. Frenk, Aaron D. Ludlow
EAGLE low-mass discs are non-self-gravitating so the softening plays no role in their vertical structure.
Astrophysics of Galaxies
no code implementations • 19 Sep 2016 • David G. Algorry, Julio F. Navarro, Mario G. Abadi, Laura V. Sales, Richard G. Bower, Robert A. Crain, Claudio Dalla Vecchia, Carlos S. Frenk, Matthieu Schaller, Joop Schaye, Tom Theuns
These discs show a wide range of bar strengths, from unbarred discs to weak bars to strongly barred systems (= 20%).
Astrophysics of Galaxies
no code implementations • 5 Sep 2016 • Alejandro Benítez-Llambay, Julio F. Navarro, Carlos S. Frenk, Till Sawala, Kyle Oman, Azadeh Fattahi, Matthieu Schaller, Joop Schaye, Robert A. Crain, Tom Theuns
We examine the baryon content of low-mass {\Lambda}CDM halos $(10^8<M_{200}/{\rm M_\odot}<5\times 10^{9})$ using the APOSTLE cosmological hydrodynamical simulations.
Astrophysics of Galaxies
no code implementations • 11 Jul 2016 • Ismael Ferrero, Julio F. Navarro, Mario G. Abadi, Laura V. Sales, Richard G. Bower, Robert A. Crain, Carlos S. Frenk, Matthieu Schaller, Joop Schaye, Tom Theuns
EAGLE galaxies evolve with lookback time following approximately the prescriptions of AM models and the observed mass-size relation of bright spirals, leading to a weak TFR evolution consistent with observation out to $z=1$.
Astrophysics of Galaxies
no code implementations • 19 Nov 2015 • Alejandro Benítez-Llambay, Julio F. Navarro, Mario G. Abadi, Stefan Gottloeber, Gustavo Yepes, Yehuda Hoffman, Matthias Steinmetz
We argue that dwarf-dwarf mergers offer a plausible scenario for the formation of systems with multiple distinct populations and, more generally, for the origin of age and metallicity gradients in dwarf spheroidals.
Astrophysics of Galaxies
1 code implementation • 25 Jul 2014 • Joop Schaye, Robert A. Crain, Richard G. Bower, Michelle Furlong, Matthieu Schaller, Tom Theuns, Claudio Dalla Vecchia, Carlos S. Frenk, I. G. McCarthy, John C. Helly, Adrian Jenkins, Y. M. Rosas-Guevara, Simon D. M. White, Maarten Baes, C. M. Booth, Peter Camps, Julio F. Navarro, Yan Qu, Alireza Rahmati, Till Sawala, Peter A. Thomas, James Trayford
Because the feedback efficiencies cannot be predicted from first principles, we calibrate them to the z~0 galaxy stellar mass function and the amplitude of the galaxy-central black hole mass relation, also taking galaxy sizes into account.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 21 May 2014 • Alejandro Benítez-Llambay, Julio F. Navarro, Mario G. Abadi, Stefan Gottloeber, Gustavo Yepes, Yehuda Hoffman, Matthias Steinmetz
We explore the impact of cosmic reionization on nearby isolated dwarf galaxies using a compilation of SFHs estimated from deep HST data and a cosmological hydrodynamical simulation of the Local Group.
Astrophysics of Galaxies
no code implementations • 5 Nov 2013 • David G. Algorry, Julio F. Navarro, Mario G. Abadi, Laura V. Sales, Matthias Steinmetz, Franziska Piontek
Counterrotating stars in disk galaxies are a puzzling dynamical feature whose origin has been ascribed to either satellite accretion events or to disk instabilities triggered by deviations from axisymmetry.
Cosmology and Nongalactic Astrophysics
no code implementations • 2 Nov 2012 • Alejandro Benitez-Llambay, Julio F. Navarro, Mario G. Abadi, Stefan Gottloeber, Gustavo Yepes, Yehuda Hoffman, Matthias Steinmetz
This "cosmic web stripping" may help to explain the scarcity of dwarf galaxies compared with the numerous low-mass halos expected in \Lambda CDM and the large diversity of star formation histories and morphologies characteristic of faint galaxies.
Cosmology and Nongalactic Astrophysics
