no code implementations • 8 Jun 2016 • Michael McLeod, Noam Libeskind, Ofer Lahav, Yehuda Hoffman
The resulting estimate for the Local Group mass, when shear information is included, is $4. 9 \times 10^{12} M_\odot$, with an error of $\pm0. 8 \times 10^{12} M_\odot$ from the 68% uncertainty in observables, and a 68% confidence interval of $^{+1. 3}_{-1. 4} \times 10^{12}M_\odot$ from the intrinsic scatter from the differences between the model and simulation masses.
Astrophysics of Galaxies Instrumentation and Methods for Astrophysics
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
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 • 1 Jun 2013 • Helene M. Courtois, Daniel Pomarede, R. Brent Tully, Yehuda Hoffman, Denis Courtois
The large scale structure of the universe is a complex web of clusters, filaments, and voids.
Cosmology and Nongalactic Astrophysics
1 code implementation • 11 Mar 2013 • Jaime E. Forero-Romero, Yehuda Hoffman, Sebastian Bustamante, Stefan Gottloeber, Gustavo Yepes
It follows that within current observational uncertainties the quasi-conserved quantities that characterize the orbit of the LG, i. e. e_tot, r_orb and lambda, do not challenge the standard LCDM model, but the model is in tension with regard to the actual values of the radial and tangential velocities.
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
