Swirls of FIRE: spatially resolved gas velocity dispersions and star formation rates in FIRE-2 disc environments
Swirls of FIRE: spatially resolved gas velocity dispersions and star formation rates in FIRE-2 disc environments
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FIRE 漩涡:FIRE-2 盘环境中空间分辨的气体速度弥散和恒星形成速率
DOI:
10.1093/mnras/staa1619
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发表时间:
2020
影响因子:
4.8
通讯作者:
Wetzel, Andrew
中科院分区:
文献类型:
--
作者:
Orr, Matthew E;Hayward, Christopher C;Medling, Anne M;Gurvich, Alexander B;Hopkins, Philip F;Murray, Norman;Pineda, Jorge L;Faucher-Giguère, Claude-André;Kereš, Dušan;Wetzel, Andrew
We study the spatially resolved (sub-kpc) gas velocity dispersion (σ)–star formation rate (SFR) relation in the FIRE-2 (Feedback in Realistic Environments) cosmological simulations. We specifically focus on Milky Way-mass disc galaxies at late times (z≈ 0). In agreement with observations, we find a relatively flat relationship, with σ ≈ 15–30 km s−1in neutral gas across 3 dex in SFRs. We show that higher dense gas fractions (ratios of dense gas to neutral gas) and SFRs are correlated at constant σ. Similarly, lower gas fractions (ratios of gas to stellar mass) are correlated with higher σ at constant SFR. The limits of the σ–ΣSFRrelation correspond to the onset of strong outflows. We see evidence of ‘on-off’ cycles of star formation in the simulations, corresponding to feedback injection time-scales of 10–100 Myr, where SFRs oscillate about equilibrium SFR predictions. Finally, SFRs and velocity dispersions in the simulations agree well with feedback-regulated and marginally stable gas disc (Toomre’sQ= 1) model predictions, and the simulation data effectively rule out models assuming that gas turns into stars at (low) constant efficiency (i.e. 1 per cent per free-fall time). And although the simulation data do not entirely exclude gas accretion/gravitationally powered turbulence as a driver of σ, it appears to be subdominant to stellar feedback in the simulated galaxy discs atz≈ 0.
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影响因子:
4.8
作者:
R. Bassett;K. Glazebrook;D. Fisher;A. Green;E. Wisnioski;D. Obreschkow;E. Cooper;R. Abraham;I. Damjanov;P. Mcgregor
通讯作者:
P. Mcgregor
影响因子:
4.8
作者:
K. El-Badry;E. Quataert;A. Wetzel;P. Hopkins;D. Weisz;T. K. Chan;Alex Fitts;M. Boylan-Kolchin;D. Kerevs;C. Faucher-Giguère;S. Garrison-Kimmel
通讯作者:
K. El-Badry;E. Quataert;A. Wetzel;P. Hopkins;D. Weisz;T. K. Chan;Alex Fitts;M. Boylan-Kolchin;D. Kerevs;C. Faucher-Giguère;S. Garrison-Kimmel
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
Diane M. Salim;C. Federrath;L. Kewley
通讯作者:
L. Kewley
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
M. Krumholz;A. Burkert
通讯作者:
A. Burkert
影响因子:
4.8
作者:
Ma, Xiangcheng;Hopkins, Philip F.;Wetzel, Andrew R.;Kirby, Evan N.;Anglés-Alcázar, Daniel;Faucher-Giguère, Claude-André;Kereš, Dušan;Quataert, Eliot
通讯作者:
Quataert, Eliot