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dc.contributor.authorCecil, G.
dc.contributor.authorFogarty, L. M. R.
dc.contributor.authorRichards, S.
dc.contributor.authorBland-Hawthorn, J.
dc.contributor.authorLange, R.
dc.contributor.authorMoffett, A.
dc.contributor.authorCatinella, B.
dc.contributor.authorCortese, L.
dc.contributor.authorHo, I. -T.
dc.contributor.authorTaylor, E. N.
dc.contributor.authorBryant, J. J.
dc.contributor.authorAllen, J. T.
dc.contributor.authorSweet, S. M.
dc.contributor.authorCroom, S. M.
dc.contributor.authorDriver, S. P.
dc.contributor.authorGoodwin, M.
dc.contributor.authorKelvin, L.
dc.contributor.authorGreen, A. W.
dc.contributor.authorKonstantopoulos, I. S.
dc.contributor.authorOwers, M. S.
dc.contributor.authorLawrence, J. S.
dc.contributor.authorLorente, N. P. F.
dc.date.accessioned2018-01-23T10:30:09Z
dc.date.available2018-01-23T10:30:09Z
dc.date.issued2016-02-21
dc.identifier252099125
dc.identifierbdc52e03-6ff9-4c5f-8e96-23d844e8836b
dc.identifier84960824973
dc.identifier.citationCecil , G , Fogarty , L M R , Richards , S , Bland-Hawthorn , J , Lange , R , Moffett , A , Catinella , B , Cortese , L , Ho , I -T , Taylor , E N , Bryant , J J , Allen , J T , Sweet , S M , Croom , S M , Driver , S P , Goodwin , M , Kelvin , L , Green , A W , Konstantopoulos , I S , Owers , M S , Lawrence , J S & Lorente , N P F 2016 , ' The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems ' , Monthly Notices of the Royal Astronomical Society , vol. 456 , no. 2 , pp. 1299-1319 . https://doi.org/10.1093/mnras/stv2643en
dc.identifier.issn0035-8711
dc.identifier.otherArXiv: http://arxiv.org/abs/1511.05445v1
dc.identifier.urihttps://hdl.handle.net/10023/12580
dc.description.abstractLine-of-sight velocities of gas and stars can constrain dark matter (DM) within rotationally supported galaxies if they trace circular orbits extensively. Photometric asymmetries may signify non-circular motions, requiring spectra with dense spatial coverage. Our integral-field spectroscopy of 178 galaxies spanned the mass range of the Sydney-AAO Multi-object integral field spectrograph (SAMI) Galaxy Survey. We derived circular speed curves (CSCs) of gas and stars from non-parametric fits out to r ∼ 2re. For 12/14 with measured H i profiles, ionized gas and H i maximum velocities agreed. We fitted mass-follows-light models to 163 galaxies by approximating the radial light profile as nested, very flattened mass homeoids viewed as a Sérsic form. Fitting broad-band spectral energy distributions to Sloan Digital Sky Survey images gave median stellar mass/light 1.7 assuming a Kroupa initial mass function (IMF) versus 2.6 dynamically. Two-thirds of the dynamical mass/light measures were consistent with star+remnant IMFs. One-fifth required upscaled starlight to fit, hence comparable mass of unobserved baryons and/or DM distributed like starlight across the SAMI aperture that came to dominate motions as the starlight CSCs declined rapidly. The rest had mass distributed differently from light. Subtracting fits of Sérsic radial profiles to 13 VIKING Z-band images revealed residual weak bars. Near the bar major axis, we assessed m = 2 streaming velocities, and found deviations usually <30 km s−1 from the CSC; three showed no deviation. Thus, asymmetries rarely influenced the CSC despite colocated shock-indicating, emission-line flux ratios in more than 2/3 of our sample.
dc.format.extent5547096
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.subjectGalaxies: kinematics and dynamicsen
dc.subjectGalaxies: spiralen
dc.subjectGalaxies: structureen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectDASen
dc.subject.lccQBen
dc.subject.lccQCen
dc.titleThe SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systemsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.identifier.doi10.1093/mnras/stv2643
dc.description.statusPeer revieweden


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