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NIHAO VII: predictions for the galactic baryon budget in dwarf to Milky Way mass haloes
Wang, Liang1,2,3; Dutton, Aaron A.3,4; Stinson, Gregory S.3; Maccio, Andrea V.3,4; Gutcke, Thales3; Kang, Xi2
2017-05-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume466Issue:4Pages:4858-4867
Abstract

We use the Numerical Investigation of a Hundred Astrophysical Objects (NIHAO) galaxy formation simulations to make predictions for the baryonic budget in present day galaxies ranging from dwarf (M-200 similar to 10(10)M circle dot) toMilkyWay (M-200 similar to 10(12)M circle dot) masses. The sample is made of 88 independent high-resolution cosmological zoom-in simulations. NIHAO galaxies reproduce key properties of observed galaxies, such as the stellar mass versus halo mass and cold gas versus stellar mass relations. Thus they make plausible predictions for the baryon budget. We present the mass fractions of stars, cold gas (T< 10(4) K), cool gas (10(4) < T< 10(5) K), warm-hot gas (10(5) < T < 5 x 10(6) K) and hot gas (T > 5 x 10(6) K), inside the virial radius, R200. Compared to the predicted baryon mass, using the dark halo mass and the universal baryon fraction, f(b) = Omega(b)/Omega(m) = 0.15, we find that all of our haloes are missing baryons. The missing mass has been relocated past 2 virial radii, and cool gas dominates the corona at low mass (M-200 Alpha less than or similar to 3 x 10(11)M circle dot) while the warm-hot gas dominates at high mass (M-200 less than or similar to 3 x 10(11)M circle dot). Haloes of mass M-200 greater than or similar to 10(10)M circle dot are missing similar to 90 per cent of their baryons. More massive haloes (M-200 similar to 10(12)M circle dot) retain a higher fraction of their baryons, with similar to 30 per cent missing, consistent with recent observational estimates. Moreover, these more massive haloes reproduce the observed fraction of cold, warm-hot and hot gases. The fraction of cool gas we predict (0.11 +/- 0.06) is significantly lower than the observation from COS-Halos (0.3-0.47), but agrees with the alternative analysis of Stern et al. (2016).

Keywordmethods: numerical galaxies: dwarf galaxies: evolution galaxies: formation galaxies: spiral cosmology: theory
DOI10.1093/mnras/stx066
WOS KeywordREDSHIFT CIRCUMGALACTIC MEDIUM ; METAL-LINE ABSORPTION ; DARK-MATTER HALOES ; SOFT-X-RAY ; INTERGALACTIC MEDIUM ; STELLAR FEEDBACK ; COSMOLOGICAL SIMULATIONS ; STAR-FORMATION ; PHYSICAL CONDITIONS ; MISSING BARYONS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000402849400078
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:8[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23016
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Liang; Dutton, Aaron A.; Maccio, Andrea V.
Affiliation1.Univ Western Australia, ICRAR, M468,35 Stirling Hwy, Crawley, WA 6009, Australia
2.Purple Mt Observ, 2 West Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
4.New York Univ Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates
Recommended Citation
GB/T 7714
Wang, Liang,Dutton, Aaron A.,Stinson, Gregory S.,et al. NIHAO VII: predictions for the galactic baryon budget in dwarf to Milky Way mass haloes[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,466(4):4858-4867.
APA Wang, Liang,Dutton, Aaron A.,Stinson, Gregory S.,Maccio, Andrea V.,Gutcke, Thales,&Kang, Xi.(2017).NIHAO VII: predictions for the galactic baryon budget in dwarf to Milky Way mass haloes.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,466(4),4858-4867.
MLA Wang, Liang,et al."NIHAO VII: predictions for the galactic baryon budget in dwarf to Milky Way mass haloes".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 466.4(2017):4858-4867.
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