Gravitational torques in spiral galaxies: Gas accretion as a driving mechanism of galactic evolution

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dc.contributor.authorBlock, DL
dc.contributor.authorBournaud, F
dc.contributor.authorCombes, F
dc.contributor.authorPuerari, I
dc.contributor.authorButa, R
dc.contributor.otherUniversity of Witwatersrand
dc.contributor.otherUDICE-French Research Universities
dc.contributor.otherUniversite PSL
dc.contributor.otherObservatoire de Paris
dc.contributor.otherEcole Normale Superieure (ENS)
dc.contributor.otherInstituto Nacional de Astrofisica, Optica y Electronica
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.date.accessioned2019-08-01T19:14:14Z
dc.date.available2019-08-01T19:14:14Z
dc.date.issued2002
dc.description.abstractThe distribution of gravitational torques and bar strengths in the local Universe is derived from a detailed study of 163 galaxies observed in the near-infrared. The results are compared with numerical models for spiral galaxy evolution. It is found that the observed distribution of torques can be accounted for only with external accretion of gas onto spiral disks. Accretion is responsible for bar renewal - after the dissolution of primordial bars - as well as the maintenance of spiral structures. Models of isolated, non-accreting galaxies are ruled out. Moderate accretion rates do not explain the observational results: it is shown that galactic disks should double their mass in less than the Hubble time. The best fit is obtained if spiral galaxies are open systems, still forming today by continuous gas accretion, doubling their mass every 10 billion years.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationBlock, D.,et al. (2002): Gravitational Torques in Spiral Galaxies: Gas Accretion as a Driving Mechanism of Galactic Evolution. Astronomy and Astrophysics, 394(3). DOI: https://doi.org/10.1051/0004-6361:20021379
dc.identifier.doi10.1051/0004-6361:20021379
dc.identifier.orcidhttps://orcid.org/0000-0003-2658-7893
dc.identifier.urihttp://ir.ua.edu/handle/123456789/6181
dc.languageEnglish
dc.language.isoen_US
dc.publisherEDP Sciences
dc.subjectgalaxies : formation
dc.subjectgalaxies : evolution
dc.subjectgalaxies : spiral
dc.subjectgalaxies : fundamental parameters
dc.subjectBARRED GALAXIES
dc.subjectBARS
dc.subjectAstronomy & Astrophysics
dc.titleGravitational torques in spiral galaxies: Gas accretion as a driving mechanism of galactic evolutionen_US
dc.typetext
dc.typeArticle
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