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dc.contributor.author
Padilla, Nelson David
dc.contributor.author
Salazar Albornoz, Salvador
dc.contributor.author
Contreras, Sergio
dc.contributor.author
Cora, Sofia Alejandra
dc.contributor.author
Ruiz, Andrés Nicolás
dc.date.available
2018-01-31T17:16:43Z
dc.date.issued
2014-08
dc.identifier.citation
Padilla, Nelson David; Salazar Albornoz, Salvador; Contreras, Sergio; Cora, Sofia Alejandra; Ruiz, Andrés Nicolás; Stochastic angular momentum slews and flips and their effect on discs in galaxy formation models; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 443; 8-2014; 2801-2814
dc.identifier.issn
0035-8711
dc.identifier.uri
http://hdl.handle.net/11336/35185
dc.description.abstract
The angular momentum of galactic discs in semi-analytic models of galaxy formation is usually updated in time as material is accreted to the disc by adopting a constant dimensionless spin parameter and little attention is paid to the effects of accretion with misaligned angular momenta. These effects are the subject of this paper, where we adopt a Monte Carlo simulation for the changes in the direction of the angular momentum of a galaxy disc as it accretes matter based on accurate measurements from dark-matter haloes in the Millennium II simulation. In our semi-analytic model implementation, the flips seen in the dark-matter haloes are assumed to be the same for the cold baryons; however, we also assume that in the latter the flip also entails a difficulty for the disc to increase its angular momentum which causes the disc to become smaller relative to a no-flip case. This makes star formation to occur faster, especially in low-mass galaxies at all redshifts allowing galaxies to reach higher stellar masses faster. We adopt a new condition for the triggering of starbursts during mergers. As these produce the largest flips it is natural to adopt the disc instability criterion to evaluate the triggering of bursts in mergers instead of one based on mass ratios as in the original model. The new implementation reduces the average lifetimes of discs by a factor of ∼2, while still allowing old ages for the present-day discs of large spiral galaxies. It also provides a faster decline of star formation in massive galaxies and a better fit to the bright end of the luminosity function at z = 0.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley Blackwell Publishing, Inc
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Evolution of Galaxies
dc.subject
Fundamental Parameters of Galaxies
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Structure of Galaxies
dc.subject.classification
Astronomía
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Ciencias Físicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Stochastic angular momentum slews and flips and their effect on discs in galaxy formation models
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-01-03T20:58:17Z
dc.journal.volume
443
dc.journal.pagination
2801-2814
dc.journal.pais
Reino Unido
dc.journal.ciudad
Londres
dc.description.fil
Fil: Padilla, Nelson David. Pontificia Universidad Católica de Chile; Chile
dc.description.fil
Fil: Salazar Albornoz, Salvador. Max-planck-institut Fur Extraterrestrische Physik;
dc.description.fil
Fil: Contreras, Sergio. Pontificia Universidad Católica de Chile; Chile
dc.description.fil
Fil: Cora, Sofia Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica la Plata; Argentina
dc.description.fil
Fil: Ruiz, Andrés Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomia Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomia Teórica y Experimental; Argentina
dc.journal.title
Monthly Notices of the Royal Astronomical Society
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://mnras.oxfordjournals.org/content/443/3/2801.full.pdf
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1093/mnras/stu1321
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