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 optimised algorithm to fit the intrinsic shape of galaxies using an...
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ftdatacite:10.48550/arxiv.1709.03585 2023-05-15T18:11:35+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. Lopez-Sanchez, A. R. Medling, A. M. Owers, M. S. Richards, S. N. Scott, N. Taranu, D. S. Tonini, C. Zafar, T. 2017 https://dx.doi.org/10.48550/arxiv.1709.03585 https://arxiv.org/abs/1709.03585 unknown arXiv https://dx.doi.org/10.1093/mnras/stx1869 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Astrophysics of Galaxies astro-ph.GA FOS Physical sciences article-journal Article ScholarlyArticle Text 2017 ftdatacite https://doi.org/10.48550/arxiv.1709.03585 https://doi.org/10.1093/mnras/stx1869 2022-04-01T10:14:22Z 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 optimised 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 ATLAS3D 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 Lambda_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 multi-merger assembly histories. This range in assembly histories inferred from intrinsic shapes is broadly consistent with expectations from cosmological simulations. : 15 pages, 11 figures, MNRAS in print Text sami DataCite Metadata Store (German National Library of Science and Technology) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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language |
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topic |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
spellingShingle |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences 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. Lopez-Sanchez, A. 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 |
topic_facet |
Astrophysics of Galaxies astro-ph.GA FOS Physical sciences |
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 optimised 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 ATLAS3D 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 Lambda_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 multi-merger assembly histories. This range in assembly histories inferred from intrinsic shapes is broadly consistent with expectations from cosmological simulations. : 15 pages, 11 figures, MNRAS in print |
format |
Text |
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. Lopez-Sanchez, A. R. Medling, A. M. Owers, M. S. Richards, S. N. Scott, N. Taranu, D. S. Tonini, C. Zafar, T. |
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. Lopez-Sanchez, A. 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 |
arXiv |
publishDate |
2017 |
url |
https://dx.doi.org/10.48550/arxiv.1709.03585 https://arxiv.org/abs/1709.03585 |
genre |
sami |
genre_facet |
sami |
op_relation |
https://dx.doi.org/10.1093/mnras/stx1869 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1709.03585 https://doi.org/10.1093/mnras/stx1869 |
_version_ |
1766184233644064768 |