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The structure and metallicity gradient in the extreme outer disk of NGC7793

Vlajic, M; Bland-Hawthorn, Joss; Freeman, Kenneth

Description

Studies of outer regions of spirals disks are fundamental to our understanding of both the process of galaxy assembly and the subsequent secular evolution of galaxies. In an earlier series of papers, we explored the extent and abundance gradient in the outer disk of NGC300 and found an extended purely exponential disk with a metallicity gradient which flattens off in the outermost regions. We now continue the study of outskirts of pure disk spirals with another Sculptor Group spiral, NGC7793....[Show more]

dc.contributor.authorVlajic, M
dc.contributor.authorBland-Hawthorn, Joss
dc.contributor.authorFreeman, Kenneth
dc.date.accessioned2015-12-10T23:32:59Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/69087
dc.description.abstractStudies of outer regions of spirals disks are fundamental to our understanding of both the process of galaxy assembly and the subsequent secular evolution of galaxies. In an earlier series of papers, we explored the extent and abundance gradient in the outer disk of NGC300 and found an extended purely exponential disk with a metallicity gradient which flattens off in the outermost regions. We now continue the study of outskirts of pure disk spirals with another Sculptor Group spiral, NGC7793. Using the Gemini Multi Object Spectrograph camera at Gemini South, we trace the disk of NGC7793 with star counts out to ∼9 scale lengths, corresponding to 11.5kpc at our calibrated distance of 3.61 ± 0.53Mpc. The outer disk of NGC7793 shows no evidence of a break in its light profile down to an effective surface brightness of ∼30 mag arcsec-2 (∼3 mag arcsec-2 deeper than what has been achieved with surface photometry) and exhibits a non-negative abundance gradient within the radial extent of our data.
dc.publisherIOP Publishing
dc.rightsAuthor/s retain copyright
dc.sourceAstrophysical Journal, The
dc.subjectKeywords: galaxies: abundances; galaxies: individual (NGC 7793); galaxies: stellar content; galaxies: structure
dc.titleThe structure and metallicity gradient in the extreme outer disk of NGC7793
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume732
dc.date.issued2011
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationf2965xPUB1915
local.type.statusPublished Version
local.contributor.affiliationVlajic, M, Astrophysikalisches Institut Potsdam
local.contributor.affiliationBland-Hawthorn, Joss, University of Sydney
local.contributor.affiliationFreeman, Kenneth, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.issue1
local.bibliographicCitation.startpageA7
local.bibliographicCitation.lastpage10
local.identifier.doi10.1088/0004-637X/732/1/7
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2016-02-24T08:19:26Z
local.identifier.scopusID2-s2.0-79955667119
local.identifier.thomsonID000289626500007
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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