The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies with GEAR

By Yves Revaz, P. Jablonka, T. Sawala, V. Hill, B. Letarte, M. Irwin, G. Battaglia, A. Helmi, M. Shetrone, E. Tolstoy and 1 more. 2009

154 citations recorded by the source corpus.

We present the fully parallel chemo-dynamical Tree/SPH code GEAR, which allows us to perform high resolution simulations with detailed chemical diagnostics. Starting from the public version of Gadget-2, we included the complex treatment of the baryon physics: gas cooling, star formation law, chemical evolution, and supernova feedback. We qualified the performances of GEAR in the case of dwarf spheroidal galaxies (dSphs) galaxies. Our code GEAR conserves the total energy budget of the systems to better than 5% over 14 Gyr and provides an excellent convergence of the results with numerical resolution. We showed that models of dSphs in a static Euclidean space, where the expansion of the universe is neglected are valid. In addition, we tackled some existing open questions in the field, such as the stellar mass fraction of dSphs and its link to the predicted dark matter halo mass function, the effect of supernova feedback, the spatial distribution of the stellar populations, and the origin of the diversity in star formation histories and chemical abundance patterns. Strong supernova-driven winds seem incompatible with the observed metallicities and luminosities. Despite newly formed stars being preferentially found in the galaxy central parts, turbulent motions in the gas can quickly erase any metallicity gradient. The diversity in properties of dSph are related to a range of total masses, as well as a range of dispersion in the central densities, which is also seen in the halos emerging from a Lambda CDM cosmogony.

Subfields: Astronomy and Astrophysics, Instrumentation, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/225b773d191a6935927ae11c76ffc96348944376

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Citations in the corpus

THE COUPLING BETWEEN THE CORE/CUSP AND MISSING SATELLITE PROBLEMS (2012, background): “Recently, Revaz & Jablonka (2012) argue that ǫSN ≈ 0.05 in order to describe the relation between metallicity and luminosity found in dSphs (e.g. Kirby et al. 2011).”
Gas-to-dust mass ratios in local galaxies over a 2 dex metallicity range (2013, background): “Episodic star formation histories have also been suggested in Nbody/smoothed particle hydrodynamics simulations of dwarf galaxy evolution (e.g., Valcke et al. 2008; Revaz & Jablonka 2012).”
Near-Field Cosmology with Extremely Metal-Poor Stars (2015, unknown): “See also Revaz & Jablonka (2012).”
THE ACS NEARBY GALAXY SURVEY TREASURY. VIII. THE GLOBAL STAR FORMATION HISTORIES OF 60 DWARF GALAXIES IN THE LOCAL VOLUME (2011, background): “…number of simulations have demonstrated that the energy due to stellar feedback is insufficient to completely expel cold gas (e.g., HI) from the gravitational potential of a typical dwarf galaxy (e.g., 23 Mac Low & Ferrara 1999; D’Ercole & Brighenti 1999; Marcolini et al. 2006; Revaz et al. 2009).”
MULTI-ELEMENT ABUNDANCE MEASUREMENTS FROM MEDIUM-RESOLUTION SPECTRA. III. METALLICITY DISTRIBUTIONS OF MILKY WAY DWARF SATELLITE GALAXIES (2010, methodology): “Only recently, Revaz et al. (2009) modeled the abundance distributions of several MW satellites.”
Cusp-core transformations in dwarf galaxies: observational predictions (2012, background): “In the category of feedback models where cusp-core transformations are expected (Stinson et al. 2007; Valcke et al. 2008; Revaz et al. 2009; Cloet-Osselaer et al. 2012, and this paper), the SFH is extremely bursty with peak to trough variations of 10 and a duty cycle of roughly one dynamical time.”
GRACKLE: a chemistry and cooling library for astrophysics (2016, unknown): “…2006) • Cosmos++ (Anninos et al. 2003, 2005) • Enzo (Bryan et al. 2014) • Gadget-3 (Springel 2005) • GAMER (Schive et al. 2010) • GASOLINE (Wadsley et al. 2004) • Gear (Revaz & Jablonka 2012b,a) • Gizmo (Hopkins 2015) • RAMSES (Teyssier 2002) • SPHS (Read & Hayfield 2012) • SWIFT (Gonnet et al.…”
Formation of isolated dwarf galaxies with feedback (2009, background): “…simulations that atomic hydrogen cooling alone is not sufficient to form the observed dwarf galaxies, and they as well as other authors (e.g. Mashchenko et al. 2008; Revaz et al. 2009) have found different ways to include low temperature cooling due to molecules and metals in their simulations.”
The star formation and chemical evolution history of the Fornax dwarf spheroidal galaxy (2012, methodology): “Another scenario is that initially expelled gas remained bound to the system for an extended period of time, and fell back onto the galaxy, leading to an episode of star formation similar to what is predicted by simulations (Revaz et al. 2009).”
Small scale problems of the $\Lambda$CDM model: a short review (2016, unknown): “ns of Behroozi et al. [305], Kravtsov [304], and Moster et al. [306] respectively (panel reproduced from [302]). b.too high a value of energy coupling, e SN ’0.4, compared to 0.05, a value deduced by [307]; c.a very high star formation threshold [195,308] required to obtain the results of [58]; d.th”