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NIHAO III: the constant disc gas mass conspiracy
Stinson, G. S.1; Dutton, A. A.1; Wang, L.1,2; Maccio, A. V.1; Herpich, J.1; Bradford, J. D.3; Quinn, T. R.4; Wadsley, J.5; Keller, B.5
2015-11-21
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume454Issue:1Pages:1105-1116
AbstractWe show that the cool gas masses of galactic discs reach a steady state that lasts many Gyr after their last major merger in cosmological hydrodynamic simulations. The mass of disc gas, M-gas, depends mostly upon a galaxy virial mass and halo's spin, and less upon stellar feedback. Haloes with low spin have high star formation efficiency and lower disc gas mass. Similarly, lower stellar feedback leads to more star formation so the gas mass ends up being nearly the same regardless of stellar feedback strength. Rather than regulating cool gas mass, stellar feedback regulates the mass of stars that forms. Even considering spin, the M-gas relation with halo mass, M-200 only shows a factor of 3 scatter. The simulated M-gas-M-200 relation shows a break at M-200 = 2 x 10(11) M-circle dot that corresponds to an observed break in the M-gas-M-star relation. The galaxies that maintain constant disc masses share a common halo gas density profile shape in all the simulated galaxies. In their outer regions, the profiles are isothermal. Where the profile rises above n = 10(-3) cm(-3), the gas readily cools and the profile steepens. Inside the disc, rotation supports gas with a flatter density profile. Energy injection from stellar feedback provides pressure support to the halo gas to prevent runaway cooling flows. The constant gas mass makes simpler models for galaxy formation possible, either using a 'bathtub' model for star formation rates or when modelling chemical evolution.
KeywordHydrodynamics Galaxies: Formation Galaxies: Ism
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1093/mnras/stv1985
WOS KeywordDARK-MATTER HALOES ; STAR-FORMING GALAXIES ; SMOOTHED-PARTICLE HYDRODYNAMICS ; FAST ALPHA SURVEY ; ARECIBO SDSS SURVEY ; MOLECULAR GAS ; SCALING RELATIONS ; STELLAR FEEDBACK ; ILLUSTRIS PROJECT ; SPIRAL GALAXIES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000363657000079
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16031
Collection中国科学院紫金山天文台研究生部_学生文章
Affiliation1.Max Planck Inst Astron, D-69117 Heidelberg, Germany
2.Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
3.Yale Univ, Dept Astron, New Haven, CT 06520 USA
4.Univ Washington, Dept Astron, Seattle, WA 98195 USA
5.McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
Recommended Citation
GB/T 7714
Stinson, G. S.,Dutton, A. A.,Wang, L.,et al. NIHAO III: the constant disc gas mass conspiracy[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,454(1):1105-1116.
APA Stinson, G. S..,Dutton, A. A..,Wang, L..,Maccio, A. V..,Herpich, J..,...&Keller, B..(2015).NIHAO III: the constant disc gas mass conspiracy.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,454(1),1105-1116.
MLA Stinson, G. S.,et al."NIHAO III: the constant disc gas mass conspiracy".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 454.1(2015):1105-1116.
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