THE ROLE OF COLD FLOWS IN THE ASSEMBLY OF GALAXY DISKS

By A. Brooks, Fabio Governato, Thomas P. Quinn, C. Brook, James Wadsley. 2008

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We use high-resolution cosmological hydrodynamical simulations to demonstrate that cold flow gas accretion, particularly along filaments, modifies the standard picture of gas accretion and cooling onto galaxy disks. In the standard picture, all gas is initially heated to the virial temperature of the galaxy as it enters the virial radius. Low-mass galaxies are instead dominated by accretion of gas that stays well below the virial temperature, and even when a hot halo is able to develop in more massive galaxies there exist dense filaments that penetrate inside of the virial radius and deliver cold gas to the central galaxy. For galaxies up to ∼L*, this cold accretion gas is responsible for the star formation (SF) in the disk at all times to the present. Even for galaxies at higher masses, cold flows dominate the growth of the disk at early times. Within this modified picture, galaxies are able to accrete a large mass of cold gas, with lower initial gas temperatures leading to shorter cooling times to reach the disk. Although SF in the disk is mitigated by supernovae feedback, the short cooling times allow for the growth of stellar disks at higher redshifts than predicted by the standard model.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/c9610503ccfe79fdfe434b4be7dcc9cdc8783487

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Citations in the corpus

The rising star formation histories of distant galaxies and implications for gas accretion with time (2010, result): “This is similar to expectations from theory (e.g., Robertson et al. 2004; De Lucia et al. 2006; Finlator et al. 2006, 2010; Brooks et al. 2009), which predict rising SFHs over this redshift range.”
Disc formation and the origin of clumpy galaxies at high redshift (2009, background): “Recent theoretical studies (Birnboim & Dekel 2003; Kereš et al. 2005; Dekel & Birnboim 2006; Ocvirk, Pichon & Teyssier 2008; Brooks et al. 2009; Dekel et al. 2009; Kereš et al. 2009) have demonstrated that accretion of fresh gas via cold infall can in fact be the dominant process for gas…”
FORMING REALISTIC LATE-TYPE SPIRALS IN A ΛCDM UNIVERSE: THE ERIS SIMULATION (2011, background): “At the mass scale considered here, cold flows are mostly responsible for the assembly of the star forming disk even at low redshift, as opposed to the cooling flow of the hot halo mode (Brooks et al. 2009).”
Forming a large disc galaxy from a z < 1 major merger (2008, background): “In this work, we define as ‘cold flow’ gas that has never been shocked to 3/8 the virial temperature of the parent halo (Kereš et al. 2005; Brooks et al. 2009).”
Extended Lyman-alpha emission from cold accretion streams (2011, background): “…through the diffuse shock-heated medium (Fardal et al. 2001; Birnboim & Dekel 2003; Kereš et al. 2005; Dekel & Birnboim 2006; Birnboim et al. 2007; Ocvirk et al. 2008; Dekel et al. 2009; Brooks et al. 2009; van de Voort et al. 2011b; Faucher-Giguère et al. 2011; van de Voort & Schaye 2011).”
INSIDE OUT AND UPSIDE DOWN: TRACING THE ASSEMBLY OF A SIMULATED DISK GALAXY USING MONO-AGE STELLAR POPULATIONS (2013, background): “…via violent, hierarchical accretion and coldflows at early times (Shen et al. 2012) followed by a nearly quiescent phase in which the disk grows predominantly from cold flow accretion and, to a lesser extent, from cooling of a diffuse warm/hot corona (Brooks et al. 2009; Guedes et al. 2011).”
Implementing molecular hydrogen in hydrodynamic simulations of galaxy formation (2012, background): “…of dwarf galaxies (Governato et al. 2010), theint rnal structure of disk galaxies (Governato et al. 2007; Roškar et al. 2008; Stinson et al. 2009; Brooks et al. 2009), the column density distributions of damped Lyman-α systems (Pontzen et al. 2008, 2010), and the observed stellar…”
Moving mesh cosmology: tracing cosmological gas accretion (2013, methodology): “…A catalog of similar visual comparisons for all objects with M > 1010.75M at z = {0, 1, 2, 3} is available online at www.cfa.harvard.edu/itc/research/movingmeshcosmology/. merging substructures, both resolved and unresolved (Kereš et al. 2005, 2009; Brooks et al. 2009; van de Voort et al. 2011).”
BLACK HOLE GROWTH AND ACTIVE GALACTIC NUCLEI OBSCURATION BY INSTABILITY-DRIVEN INFLOWS IN HIGH-REDSHIFT DISK GALAXIES FED BY COLD STREAMS (2011, background): “However, baryons are fed into highredshift galaxies through cold streams, in which the contribution of smooth gas and small clumps is larger than that of mergers of mass ratio greater than 1:10 (Dekel et al. 2009a; Brooks et al. 2009).”
The cosmic baryon cycle and galaxy mass assembly in the FIRE simulations (2016, background): “…cycling of baryons between galaxies and their surrounding gas, where intergalactic accretion feeds galaxies from the cosmic web (Kereš et al. 2005; Brooks et al. 2009; Dekel et al. 2009; Kereš et al. 2009a; Faucher-Giguère et al. 2011; van de Voort et al. 2011), powerful winds evacuate gas from…”
Star formation sustained by gas accretion (2014, methodology): “We outline expected observational properties, keeping in mind that the numerical methods used to carry out the simulations may matter for some important details since the resolution is not good enough to capturemany of the physical processes controlling the gas infall (the typical mass resolution is”
THE CIRCUMGALACTIC MEDIUM OF MASSIVE GALAXIES AT z ∼ 3: A TEST FOR STELLAR FEEDBACK, GALACTIC OUTFLOWS, AND COLD STREAMS (2012, background): “This cold accretion mode occurs mainly along dense streams that deliver fresh fuel for star formation to the disk (e.g. Brooks et al. 2009).”
NEW CONSTRAINTS ON THE EVOLUTION OF THE STELLAR-TO-DARK MATTER CONNECTION: A COMBINED ANALYSIS OF GALAXY–GALAXY LENSING, CLUSTERING, AND STELLAR MASS FUNCTIONS FROM z = 0.2 to z = 1 (2011, background): “…(e.g., Bower et al. 2006; Croton et al. 2006; Somerville et al. 2008; Zehavi et al. 2011a) and hydrodynamical simulations (Kereš et al. 2005, 2009; Crain et al. 2009; Brooks et al. 2009; Gabor et al. 2011; Agertz et al. 2011) that aim to disentangle the relative contributions of such mechanisms.”
Gaseous Galaxy Halos (2012, background): “Analytic arguments (Birnboim & Dekel, 2003; Dekel & Birnboim, 2006; Binney, 1977) and SPH simulations have shown that some of the gas will never be shock-heated to the virial temperature of the halo and be accreted via a “cold mode” (Kereš et al., 2005; Brooks et al., 2009).”
THE GASEOUS ENVIRONMENT OF HIGH-z GALAXIES: PRECISION MEASUREMENTS OF NEUTRAL HYDROGEN IN THE CIRCUMGALACTIC MEDIUM OF z ∼ 2–3 GALAXIES IN THE KECK BARYONIC STRUCTURE SURVEY (2012, background): “The galaxies in our sample have halo masses comparable to the theoretically expected transition mass between “cold mode” and “hot mode” accretion (van de Voort et al. 2011b; Faucher-Giguère et al. 2011; Kereš et al. 2009; Ocvirk et al. 2008); most of these authors predict that both hot and cold accr”
Feedback and recycled wind accretion: assembling the z= 0 galaxy mass function (2009, background): “…gas dominates the halo gas, although dense filaments at high redshifts (z & 2) still allow cold mode accretion to proceed even above this threshold mass (K05; Dekel & Birnboim 2006; Kereš 2007; Ocvirck et al. 2008; Kereš et al. 2009a, hereafter K09a; Brooks et al. 2009; Dekel et al. 2009).”
MORPHOLOGIES OF ∼190,000 GALAXIES AT z = 0–10 REVEALED WITH HST LEGACY DATA. I. SIZE EVOLUTION (2015, background): “The smaller size in redder bands would be interpreted as heavier dust attenuation in the galactic central regions in bluer bands (e.g., Kelvin et al. 2012) and/or the inside-out disk formation (e.g., Brooks et al. 2009; Bezanson et al. 2009; Naab et al. 2009; Nelson et al. 2012; Patel et al. 2013).”
THE DUAL ORIGIN OF STELLAR HALOS (2009, background): “Cold gas flow was found to also be the dominant contributor to the disk stars of MW1hr (Brooks et al. 2009).”