The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems
Line-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 g...
Published in: | Monthly Notices of the Royal Astronomical Society |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/12580 2023-07-02T03:33:39+02:00 The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems Cecil, 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. University of St Andrews. School of Physics and Astronomy 2018-01-23T10:30:09Z application/pdf http://hdl.handle.net/10023/12580 https://doi.org/10.1093/mnras/stv2643 eng eng Monthly Notices of the Royal Astronomical Society Cecil , 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/stv2643 0035-8711 PURE: 252099125 PURE UUID: bdc52e03-6ff9-4c5f-8e96-23d844e8836b ArXiv: http://arxiv.org/abs/1511.05445v1 Scopus: 84960824973 http://hdl.handle.net/10023/12580 https://doi.org/10.1093/mnras/stv2643 © 2016, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stv2643 Galaxies: kinematics and dynamics Galaxies: spiral Galaxies: structure QB Astronomy QC Physics DAS QB QC Journal article 2018 ftstandrewserep https://doi.org/10.1093/mnras/stv2643 2023-06-13T18:28:02Z Line-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. Publisher PDF Peer reviewed Article in Journal/Newspaper sami University of St Andrews: Digital Research Repository Starlight ENVELOPE(64.483,64.483,-70.200,-70.200) Monthly Notices of the Royal Astronomical Society 456 2 1299 1319 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Galaxies: kinematics and dynamics Galaxies: spiral Galaxies: structure QB Astronomy QC Physics DAS QB QC |
spellingShingle |
Galaxies: kinematics and dynamics Galaxies: spiral Galaxies: structure QB Astronomy QC Physics DAS QB QC Cecil, 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. The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems |
topic_facet |
Galaxies: kinematics and dynamics Galaxies: spiral Galaxies: structure QB Astronomy QC Physics DAS QB QC |
description |
Line-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. Publisher PDF Peer reviewed |
author2 |
University of St Andrews. School of Physics and Astronomy |
format |
Article in Journal/Newspaper |
author |
Cecil, 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. |
author_facet |
Cecil, 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. |
author_sort |
Cecil, G. |
title |
The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems |
title_short |
The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems |
title_full |
The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems |
title_fullStr |
The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems |
title_full_unstemmed |
The SAMI Galaxy Survey : gas streaming and dynamical M/L in rotationally supported systems |
title_sort |
sami galaxy survey : gas streaming and dynamical m/l in rotationally supported systems |
publishDate |
2018 |
url |
http://hdl.handle.net/10023/12580 https://doi.org/10.1093/mnras/stv2643 |
long_lat |
ENVELOPE(64.483,64.483,-70.200,-70.200) |
geographic |
Starlight |
geographic_facet |
Starlight |
genre |
sami |
genre_facet |
sami |
op_relation |
Monthly Notices of the Royal Astronomical Society Cecil , 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/stv2643 0035-8711 PURE: 252099125 PURE UUID: bdc52e03-6ff9-4c5f-8e96-23d844e8836b ArXiv: http://arxiv.org/abs/1511.05445v1 Scopus: 84960824973 http://hdl.handle.net/10023/12580 https://doi.org/10.1093/mnras/stv2643 |
op_rights |
© 2016, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stv2643 |
op_doi |
https://doi.org/10.1093/mnras/stv2643 |
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Monthly Notices of the Royal Astronomical Society |
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456 |
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2 |
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1299 |
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1319 |
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