Show simple item record

dc.contributor.authorHogg, JDen
dc.contributor.authorReynolds, Christopheren
dc.date.accessioned2018-09-08T06:29:12Z
dc.date.available2018-09-08T06:29:12Z
dc.date.issued2018-07-01en
dc.identifier.issn0004-637X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/279750
dc.description.abstractThe evolution of the magnetic field from the large-scale dynamo is considered a central feature of the accretion disk around a black hole. The resulting low-frequency oscillations introduced from the growth and decay of the field strength, along with the change in field orientation, play an integral role in the accretion disk behavior. Despite the importance of this process and how commonly it is invoked to explain variable features, it still remains poorly understood. We present a study of the dynamo using a suite of four global, high-resolution, MHD accretion disk simulations. We systematically vary the scale height ratio and find the large-scale dynamo fails to organize above a scale height ratio of h/r 0.2. Using spacetime diagrams of the azimuthal magnetic field, we show the large-scale dynamo is well-ordered in the thinner accretion disk models, but fails to develop the characteristic “butterfly” pattern when the scale height ratio is increased, a feature which is also reflected in the power spectra. Additionally, we calculate the dynamo α-parameter and generate synthetic light curves. Using an emission proxy, we find the disks have markedly different characters as stochastic photometric fluctuations have a larger amplitude when the dynamo is unordered.
dc.publisherUniversity of Chicago Press
dc.titleThe Influence of Accretion Disk Thickness on the Large-scale Magnetic Dynamoen
dc.typeArticle
prism.issueIdentifier1en
prism.publicationDate2018en
prism.publicationNameAstrophysical Journalen
prism.volume861en
dc.identifier.doi10.17863/CAM.27120
dcterms.dateAccepted2018-05-10en
rioxxterms.versionofrecord10.3847/1538-4357/aac439en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-07-01en
dc.contributor.orcidReynolds, Christopher [0000-0002-1510-4860]
dc.identifier.eissn1538-4357
rioxxterms.typeJournal Article/Reviewen
rioxxterms.freetoread.startdate2019-07-01


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record