The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies
Using the stellar kinematic maps and ancillary imaging data from the Sydney AAO Multi Integral field (SAMI) Galaxy Survey, the intrinsic shape of kinematically selected samples of galaxies is inferred. We implement an efficient and optimized algorithm to fit the intrinsic shape of galaxies using an...
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ftcaltechauth:oai:authors.library.caltech.edu:83287 2023-05-15T18:11:32+02:00 The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies Foster, C. van de Sande, J. D'Eugenio, F. Cortese, L. McDermid, R. M. Bland-Hawthorn, J. Brough, S. Bryant, J. Croom, S. M. Goodwin, M. Konstantopoulos, I. S. Lawrence, J. López-Sánchez, Á. R. Medling, A. M. Owers, M. S. Richards, S. N. Scott, N. Taranu, D. S. Tonini, C. Zafar, T. 2017-11-21 application/pdf https://authors.library.caltech.edu/83287/ https://authors.library.caltech.edu/83287/1/stx1869.pdf https://authors.library.caltech.edu/83287/2/1709.03585.pdf https://resolver.caltech.edu/CaltechAUTHORS:20171117-091415225 en eng Royal Astronomical Society https://authors.library.caltech.edu/83287/1/stx1869.pdf https://authors.library.caltech.edu/83287/2/1709.03585.pdf Foster, C. and van de Sande, J. and D'Eugenio, F. and Cortese, L. and McDermid, R. M. and Bland-Hawthorn, J. and Brough, S. and Bryant, J. and Croom, S. M. and Goodwin, M. and Konstantopoulos, I. S. and Lawrence, J. and López-Sánchez, Á. R. and Medling, A. M. and Owers, M. S. and Richards, S. N. and Scott, N. and Taranu, D. S. and Tonini, C. and Zafar, T. (2017) The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies. Monthly Notices of the Royal Astronomical Society, 472 (1). pp. 966-978. ISSN 0035-8711. doi:10.1093/mnras/stx1869. https://resolver.caltech.edu/CaltechAUTHORS:20171117-091415225 <https://resolver.caltech.edu/CaltechAUTHORS:20171117-091415225> other Article PeerReviewed 2017 ftcaltechauth https://doi.org/10.1093/mnras/stx1869 2021-11-18T18:44:19Z Using the stellar kinematic maps and ancillary imaging data from the Sydney AAO Multi Integral field (SAMI) Galaxy Survey, the intrinsic shape of kinematically selected samples of galaxies is inferred. We implement an efficient and optimized algorithm to fit the intrinsic shape of galaxies using an established method to simultaneously invert the distributions of apparent ellipticities and kinematic misalignments. The algorithm output compares favourably with previous studies of the intrinsic shape of galaxies based on imaging alone and our re-analysis of the ATLAS^(3D) data. Our results indicate that most galaxies are oblate axisymmetric. We show empirically that the intrinsic shape of galaxies varies as a function of their rotational support as measured by the ‘spin’ parameter proxy Λ_(Re). In particular, low-spin systems have a higher occurrence of triaxiality, while high-spin systems are more intrinsically flattened and axisymmetric. The intrinsic shape of galaxies is linked to their formation and merger histories. Galaxies with high-spin values have intrinsic shapes consistent with dissipational minor mergers, while the intrinsic shape of low-spin systems is consistent with dissipationless multimerger assembly histories. This range in assembly histories inferred from intrinsic shapes is broadly consistent with expectations from cosmological simulations. Article in Journal/Newspaper sami Caltech Authors (California Institute of Technology) Monthly Notices of the Royal Astronomical Society 472 1 966 978 |
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Caltech Authors (California Institute of Technology) |
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ftcaltechauth |
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English |
description |
Using the stellar kinematic maps and ancillary imaging data from the Sydney AAO Multi Integral field (SAMI) Galaxy Survey, the intrinsic shape of kinematically selected samples of galaxies is inferred. We implement an efficient and optimized algorithm to fit the intrinsic shape of galaxies using an established method to simultaneously invert the distributions of apparent ellipticities and kinematic misalignments. The algorithm output compares favourably with previous studies of the intrinsic shape of galaxies based on imaging alone and our re-analysis of the ATLAS^(3D) data. Our results indicate that most galaxies are oblate axisymmetric. We show empirically that the intrinsic shape of galaxies varies as a function of their rotational support as measured by the ‘spin’ parameter proxy Λ_(Re). In particular, low-spin systems have a higher occurrence of triaxiality, while high-spin systems are more intrinsically flattened and axisymmetric. The intrinsic shape of galaxies is linked to their formation and merger histories. Galaxies with high-spin values have intrinsic shapes consistent with dissipational minor mergers, while the intrinsic shape of low-spin systems is consistent with dissipationless multimerger assembly histories. This range in assembly histories inferred from intrinsic shapes is broadly consistent with expectations from cosmological simulations. |
format |
Article in Journal/Newspaper |
author |
Foster, C. van de Sande, J. D'Eugenio, F. Cortese, L. McDermid, R. M. Bland-Hawthorn, J. Brough, S. Bryant, J. Croom, S. M. Goodwin, M. Konstantopoulos, I. S. Lawrence, J. López-Sánchez, Á. R. Medling, A. M. Owers, M. S. Richards, S. N. Scott, N. Taranu, D. S. Tonini, C. Zafar, T. |
spellingShingle |
Foster, C. van de Sande, J. D'Eugenio, F. Cortese, L. McDermid, R. M. Bland-Hawthorn, J. Brough, S. Bryant, J. Croom, S. M. Goodwin, M. Konstantopoulos, I. S. Lawrence, J. López-Sánchez, Á. R. Medling, A. M. Owers, M. S. Richards, S. N. Scott, N. Taranu, D. S. Tonini, C. Zafar, T. The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies |
author_facet |
Foster, C. van de Sande, J. D'Eugenio, F. Cortese, L. McDermid, R. M. Bland-Hawthorn, J. Brough, S. Bryant, J. Croom, S. M. Goodwin, M. Konstantopoulos, I. S. Lawrence, J. López-Sánchez, Á. R. Medling, A. M. Owers, M. S. Richards, S. N. Scott, N. Taranu, D. S. Tonini, C. Zafar, T. |
author_sort |
Foster, C. |
title |
The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies |
title_short |
The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies |
title_full |
The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies |
title_fullStr |
The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies |
title_full_unstemmed |
The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies |
title_sort |
sami galaxy survey: the intrinsic shape of kinematically selected galaxies |
publisher |
Royal Astronomical Society |
publishDate |
2017 |
url |
https://authors.library.caltech.edu/83287/ https://authors.library.caltech.edu/83287/1/stx1869.pdf https://authors.library.caltech.edu/83287/2/1709.03585.pdf https://resolver.caltech.edu/CaltechAUTHORS:20171117-091415225 |
genre |
sami |
genre_facet |
sami |
op_relation |
https://authors.library.caltech.edu/83287/1/stx1869.pdf https://authors.library.caltech.edu/83287/2/1709.03585.pdf Foster, C. and van de Sande, J. and D'Eugenio, F. and Cortese, L. and McDermid, R. M. and Bland-Hawthorn, J. and Brough, S. and Bryant, J. and Croom, S. M. and Goodwin, M. and Konstantopoulos, I. S. and Lawrence, J. and López-Sánchez, Á. R. and Medling, A. M. and Owers, M. S. and Richards, S. N. and Scott, N. and Taranu, D. S. and Tonini, C. and Zafar, T. (2017) The SAMI Galaxy Survey: the intrinsic shape of kinematically selected galaxies. Monthly Notices of the Royal Astronomical Society, 472 (1). pp. 966-978. ISSN 0035-8711. doi:10.1093/mnras/stx1869. https://resolver.caltech.edu/CaltechAUTHORS:20171117-091415225 <https://resolver.caltech.edu/CaltechAUTHORS:20171117-091415225> |
op_rights |
other |
op_doi |
https://doi.org/10.1093/mnras/stx1869 |
container_title |
Monthly Notices of the Royal Astronomical Society |
container_volume |
472 |
container_issue |
1 |
container_start_page |
966 |
op_container_end_page |
978 |
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1766184181093629952 |