NIHAO-LG: the uniqueness of Local Group dwarf galaxies

被引：9

作者：

Arora, Nikhil ^{[1
]}

Maccio, Andrea, V ^{[2
,3
,4
]}

Courteau, Stephane ^{[1
]}

Buck, Tobias ^{[5
]}

Libeskind, Noam, I ^{[5
,6
]}

Sorce, Jenny G. ^{[5
,7
,8
]}

Brook, Chris B. ^{[9
,10
]}

Hoffman, Yehuda ^{[11
]}

Yepes, Gustavo ^{[12
,13
]}

Carlesi, Edoardo ^{[11
]}

Stone, Connor ^{[1
]}

机构：

[1] Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada

[2] New York Univ Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates

[3] New York Univ Abu Dhabi, Ctr Astro Particle & Planetary Phys CAP3, Abu Dhabi, U Arab Emirates

[4] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[5] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[6] Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, IP2I Lyon,IN2P3,IMR 5822, F-69622 Villeurbanne, France

[7] Univ Lyon, Univ Lyon 1, Ctr Rech Astrophys Lyon, CNRS,UMR5574, F-69007 Lyon, France

[8] Univ Paris Saclay, Inst Astrophys Spatiale, CNRS, F-91405 Orsay, France

[9] Univ La Laguna, Ave Astrofis Francisco Sanchez, E-38200 San Cristobal la Laguna, Tenerife, Spain

[10] Inst Astrofis Canarias, Calle Via Lactea S-N, E-38206 San Cristobal la Laguna, Tenerife, Spain

[11] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[12] Univ Autonoma Madrid, Fac Ciencias, Dept Fis Teor, Modulo 8, E-28049 Madrid, Spain

[13] Univ Autonoma Madrid, Ctr Invest Avanzada Fis Fundamental CIAFF, E-28049 Madrid, Spain

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 512卷 / 04期

基金：

以色列科学基金会; 欧洲研究理事会; 加拿大自然科学与工程研究理事会;

关键词：

galaxies: dwarf; galaxies: evolution; galaxies: formation; (galaxies:) Local Group; methods: numerical; STAR-FORMATION HISTORY; TULLY-FISHER RELATION; COLD DARK-MATTER; STELLAR MASS; UNIVERSE SIMULATIONS; FORMATION EFFICIENCY; PHYSICAL-PROPERTIES; SATELLITE GALAXIES; H I; FEEDBACK;

D O I：

10.1093/mnras/stac893

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recent observational and theoretical studies of the Local Group (LG) dwarf galaxies have highlighted their unique star-formation history, stellar metallicity, gas content, and kinematics. We investigate the commonality of these features by comparing constrained LG and field central dwarf halo simulations in the Numerical Investigation of a Hundred Astrophysical Objects (NIHAO) project. Our simulations, performed with NIHAO-like hydrodynamics which track the evolution of the Milky Way (MW) and M31 along with similar to 100 dwarfs in the LG, reveal the total gas mass and stellar properties (velocity dispersion, evolution history, etc.) of present-day LG dwarfs to be similar to field systems. However, relative to field galaxies, LG dwarfs have more cold gas in their central parts and more metal-rich gas in the halo stemming from interactions with other dwarfs living in a high-density environment like the LG. Interestingly, the direct impact of massive MW/M31 analogues on the metallicity evolution of LG dwarfs is minimal; LG dwarfs accrete high-metallicity gas mostly from other dwarfs at late times. We have also tested for the impact of metal diffusion on the chemical evolution of LG dwarfs, and found that it does not affect the stellar or gaseous content of LG dwarfs. Our simulations suggest that the stellar components of LG dwarfs offer a unique and unbiased local laboratory for galaxy-formation tests and comparisons, especially against the overall dwarf population in the Universe.

引用

页码：6134 / 6149

页数：16

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