Formation Histories of Dwarf Galaxies in the Local Group

By M. Ricotti, Nickolay Y. Gnedin. 2004

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We compare the properties of dwarf galaxies in the Local Group with the simulated galaxies formed before reionization in a cosmological simulation of unprecedented spatial and mass resolution, including radiative feedback effects. We find that a subset of the Local Group dwarfs are already remarkably similar to the simulated dwarf galaxies in all their properties before reionization. On the basis of this similarity, we propose the hypothesis that Local Group dwarfs form in a variety of ways: some of them are "true fossils" of the pre-reionization era, some of them form most of their stars later, after reionization (we call them "survivors" of the reionization era), and the rest of them form an intermediate group of "polluted fossils." We also identify a simple observational test that is able to test our hypothesis.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/876b9f44fa3c663d90959b6bd2165a1751d40bcd

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Citations in the corpus

Probing the formation of the first low‐mass stars with stellar archaeology (2007, background): “Recent simulations of the formation of dwarf galaxies from primordial gas at high redshift (Ricotti & Gnedin 2005; Kawata et al. 2006; Ripamonti et al. 2006) predict a metalpoor tail of the metallicity distribution that extends well below [Fe/H] < −3.”
The birth of a galaxy – III. Propelling reionization with the faintest galaxies (2014, methodology): “Little is published on simulated stellar metallicity data in the first galaxies (however, see Ricotti & Gnedin 2005), so we will compare the SFRs and efficiencies to previous work.”
Dark Matter Subhalos and the Dwarf Satellites of the Milky Way (2008, background): “…investigated by a number of authors in the recent literature (e.g. Bullock et al. 2000; Benson et al. 2002; Somerville 2002; Kravtsov et al. 2004; Ricotti & Gnedin 2005; Moore et al. 2006; Diemand et al. 2007a; Strigari et al. 2007a; Simon & Geha 2007), there are considerable differences in the…”
H i IN LOCAL GROUP DWARF GALAXIES AND STRIPPING BY THE GALACTIC HALO (2009, background): “An additional gas loss mechanism is photoionization during the epoch of reionization (Gnedin & Kravtsov 2006; Dijkstra et al. 2004; Madau et al. 2008; Ricotti & Gnedin 2005).”
IONIZING PHOTON ESCAPE FRACTIONS FROM HIGH-REDSHIFT DWARF GALAXIES (2008, background): “…feedback from the first stars and subsequent episodes of star formation generate outflows that reduce the baryon fraction up to a factor of 3 below the cosmic average (Ωb/ΩM ) in halos with Mvir ∼ 108M⊙ (Ricotti & Gnedin 2005; Wise & Abel 2008a; Ricotti et al. 2008; Mesigner & Dijkstra 2008).”
THE QUENCHING OF THE ULTRA-FAINT DWARF GALAXIES IN THE REIONIZATION ERA (2014, background): “…CA 95064, USA; raja@ucolick.org 10 Osservatorio Astronomico, Vicolo Dell’Osservatorio 5, I-35122 Padova, Italy; alvio.renzini@oapd.inaf.it esis, Ricotti & Gnedin (2005) proposed that dwarf galaxies could follow one of three evolutionary paths: “true fossils” that formed most of their stars…”
THE GHOSTS SURVEY. I. HUBBLE SPACE TELESCOPE ADVANCED CAMERA FOR SURVEYS DATA (2011, background): “…has sparked much debate as it places strong constraints on the nature of dark matter (e.g., Zentner & Bullock 2003; Strigari et al. 2007; Polisensky & Ricotti 2011) as well as the behavior of baryons in dark-matter potentials (e.g., Bullock et al. 2000; Ricotti & Gnedin 2005; Okamoto et al. 2010).”
The Milky Way’s bright satellites as an apparent failure of ΛCDM (2011, background): “…therefore may have an important effect on galaxy formation in the host halos of the Milky Way’s dwarf galaxies (Bullock et al. 2000; Benson et al. 2002; Somerville 2002; Kravtsov et al. 2004b; Ricotti & Gnedin 2005; Madau et al. 2008b; Bovill & Ricotti 2009; Busha et al. 2010; Lunnan et al. 2012).”
The Dynamical and Chemical Evolution of Dwarf Spheroidal Galaxies with GEAR (2009, background): “…al. (2008) and later Schroyen et al. (2011) took into account stellar winds and supernova explosions but only considered the global metallicity Z. Ricotti & Gnedin (2005) stopped their simulations very early on (z ∼ 8) but included continuum radiative transfer to compare the global properties of…”
Too big to fail? The puzzling darkness of massive Milky Way subhaloes (2011, background): “…that MW satellite galaxies correspond to subhaloes that were the most massive at some earlier time (Bullock et al. 2000; Kravtsov et al. 2004b; Ricotti & Gnedin 2005; Koposov et al. 2009; Okamoto & Frenk 2009; Busha et al. 2010), often the epoch of reionization, with galaxy formation strongly…”
PRE-REIONIZATION FOSSILS, ULTRA-FAINT DWARFS, AND THE MISSING GALACTIC SATELLITE PROBLEM (2008, background): “…of the formation of the first galaxies have shown most previously known dwarf spheroidals (dSphs) to have properties consistent with the surviving first galaxies, and predicted the existence of an undiscovered, lower surface brightness population of dwarfs (Ricotti & Gnedin 2005; hereafter, RG05).”
ELVIS: Exploring the Local Volume in Simulations (2013, background): “…Strigari et al. 2008; Walker & Peñarrubia 2011; Boylan-Kolchin et al. 2011; Zolotov et al. 2012; Garrison-Kimmel et al. 2013; Arraki et al. 2012) and as a potential hunting ground for the descendants of reionization and first light (Bullock et al. 2000; Ricotti & Gnedin 2005; Madau et al. 2008).”
Small scale problems of the $\Lambda$CDM model: a short review (2016, background): “This can prevent small mass DM haloes gas accretion, “quenching” star formation after z ' 10 [380,381,394].”
Sweating the small stuff: simulating dwarf galaxies, ultra-faint dwarf galaxies, and their own tiny satellites (2015, background): “…in the smallest dark matter halos, suggesting a threshold in halo mass below which all halos remain dark (Efstathiou 1992; Somerville 2002; Benson et al. 2002b; Kravtsov, Gnedin & Klypin 2004; Ricotti & Gnedin 2005; Moore et al. 2006; Strigari et al. 2007; Simon & Geha 2007; Madau et al. 2008).”
Forged in FIRE: cusps, cores and baryons in low-mass dwarf galaxies (2015, background): “In particular, our Ultrafaint galaxy is composed of uniformly old stars, as observed in real ultrafaint dwarf satellites of the Milky Way (Brown et al. 2014), perhaps making them fossils of reionization (Ricotti & Gnedin 2005; Bovill & Ricotti 2011).”
THE STAR FORMATION HISTORIES OF LOCAL GROUP DWARF GALAXIES. I. HUBBLE SPACE TELESCOPE/WIDE FIELD PLANETARY CAMERA 2 OBSERVATIONS (2014, background): “However, others have suggested that reionization can play an increasingly important role in the quenching of star formation in the lowest mass galaxies (e.g., Bullock et al. 2000; Ricotti & Gnedin 2005; Bovill & Ricotti 2011a,b; Brown et al. 2012; Okamoto et al. 2012).”
THE ACS NEARBY GALAXY SURVEY TREASURY. VIII. THE GLOBAL STAR FORMATION HISTORIES OF 60 DWARF GALAXIES IN THE LOCAL VOLUME (2011, background): “…among the most pressing questions in dwarf galaxy evolution (e.g., Baade 1951; Hodge 1971; Dekel & Silk 1986; Binggeli 1986; Hodge 1989; Skillman & Bender 1995; Mateo 1998; Dekel & Woo 2003; Grebel et al. 2003; Ricotti & Gnedin 2005; Mayer et al. 2006; Orban et al. 2008; Kazantzidis et al. 2010).”