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NIHAO X: reconciling the local galaxy velocity function with cold dark matter via mock H i observations
Maccio, Andrea V.1,2; Udrescu, Silviu M.1; Dutton, Aaron A.1; Obreja, Aura1; Wang, Liang3; Stinson, Greg R.2; Kang, Xi3
2016-11-21
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume463Issue:1Pages:L69-L73
Corresponding AuthorMaccio, Andrea V.(maccio@nyu.edu)
AbstractWe used 87 high-resolution hydrodynamical cosmological simulations from the NIHAO suite to investigate the relation between the maximum circular velocity (V-max(DM)) of a dark matter halo in a collisionless simulation and the velocity width of the H i gas in the same halo in the hydrodynamical simulation. These two quantities are normally used to compare theoretical and observational velocity functions and have led to a possible discrepancy between observations and predictions based on the cold dark matter (CDM) model. We show that below 100 km s(-1), there is clear bias between H i -based velocities and V-max(DM), that leads to an underestimation of the actual circular velocity of the halo. When this bias is taken into account, the CDM model has no trouble in reproducing the observed velocity function and no lack of low-velocity galaxies is actually present. Our simulations also reproduce the linewidth-stellar mass (Tully-Fisher) relation and H i sizes, indicating that the H i gas in our simulations is as extended as observed. The physical reason for the lower than expected linewidths is that, in contrast to high-mass galaxies, low-mass galaxies no longer have extended thin H i rotating discs, as is commonly assumed.
Keywordmethods: numerical galaxies: formation galaxies: kinematics and dynamics galaxies: structure cosmology: theory dark matter
DOI10.1093/mnrasl/slw147
WOS KeywordMILKY-WAY SATELLITES ; LAMBDA-CDM ; COSMOLOGICAL SIMULATIONS ; GALACTIC SATELLITES ; DWARF GALAXIES ; FIELD GALAXIES ; COSMIC TIME ; ABUNDANCE ; FEEDBACK ; MODEL
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000386157100015
PublisherOXFORD UNIV PRESS
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23415
Collection中国科学院紫金山天文台
Corresponding AuthorMaccio, Andrea V.
Affiliation1.New York Univ Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates
2.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
3.Purple Mt Observ, Partner Grp MPI Astron, 2 West Beijing Rd, Nanjing 210008, Peoples R China
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Maccio, Andrea V.,Udrescu, Silviu M.,Dutton, Aaron A.,et al. NIHAO X: reconciling the local galaxy velocity function with cold dark matter via mock H i observations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,463(1):L69-L73.
APA Maccio, Andrea V..,Udrescu, Silviu M..,Dutton, Aaron A..,Obreja, Aura.,Wang, Liang.,...&Kang, Xi.(2016).NIHAO X: reconciling the local galaxy velocity function with cold dark matter via mock H i observations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,463(1),L69-L73.
MLA Maccio, Andrea V.,et al."NIHAO X: reconciling the local galaxy velocity function with cold dark matter via mock H i observations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 463.1(2016):L69-L73.
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