The origin of spin in galaxies: clues from simulations of atomic cooling haloes
Author
dc.contributor.author
Prieto, Joaquín
Author
dc.contributor.author
Jiménez, Raúl
Author
dc.contributor.author
Haiman, Zoltán
Author
dc.contributor.author
González, Roberto E.
Admission date
dc.date.accessioned
2015-12-15T01:46:17Z
Available date
dc.date.available
2015-12-15T01:46:17Z
Publication date
dc.date.issued
2015
Cita de ítem
dc.identifier.citation
Monthly Noticies of the Royal Astronomical Society Volumen: 452 Número: 1 2015
en_US
Identifier
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DOI: 10.1093/mnras/stv1234
Identifier
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https://repositorio.uchile.cl/handle/2250/135708
General note
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Artículo de publicación ISI
en_US
Abstract
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In order to elucidate the origin of spin in both dark matter and baryons in galaxies, we have performed hydrodynamical simulations from cosmological initial conditions. We study atomic cooling haloes in the redshift range 100 > z > 9 with masses of the order of 10(9) M-circle dot at redshift z = 10. We assume that the gas has primordial composition and that H-2-cooling and prior star formation in the haloes have been suppressed. We present a comprehensive analysis of the gas and dark matter properties of four haloes with very low (lambda approximate to 0.01), low (lambda approximate to 0.04), high (lambda approximate to 0.06) and very high (lambda approximate to 0.1) spin parameter. Our main conclusion is that the spin orientation and magnitude is initially well described by tidal torque linear theory, but later on is determined by the merging and accretion history of each halo. We provide evidence that the topology of the merging region, i.e. the number of colliding filaments, gives an accurate prediction for the spin of dark matter and gas: haloes at the centre of knots will have low spin while those in the centre of filaments will have high spin. The spin of a halo is given by lambda approximate to 0.05 x (7.6/number of filaments)(5.1).
en_US
Patrocinador
dc.description.sponsorship
NASA
NNX11AE05G
Mineco
FPA2011-29678-C02-02
Anillo de Ciencia y Tecnologia
ACT1101
Centro de Astronomia y Tecnologias Afines
PFB-06
Proyecto Comite Mixto ESO
3312-013-82
Anillo
ACT-86
FONDEQUIP
AIC-57
QUIMAL
130008