The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours
ABSTRACT Using data from the SAMI Galaxy Survey, we investigate the correlation between the projected stellar kinematic spin vector of 1397 SAMI galaxies and the line-of-sight motion of their neighbouring galaxies. We calculate the luminosity-weighted mean velocity difference between SAMI galaxies a...
Published in: | Monthly Notices of the Royal Astronomical Society |
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Oxford University Press (OUP)
2022
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Online Access: | http://dx.doi.org/10.1093/mnras/stac1841 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac1841/44422064/stac1841.pdf https://academic.oup.com/mnras/article-pdf/515/1/984/45475082/stac1841.pdf |
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croxfordunivpr:10.1093/mnras/stac1841 2024-01-14T10:10:20+01:00 The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours Mai, Yifan Vaughan, Sam P Croom, Scott M van de Sande, Jesse Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J Colless, Matthew Goodwin, Michael Groves, Brent Konstantopoulos, Iraklis S Lawrence, Jon S Lorente, Nuria P F Richards, Samuel N Australian Research Council CAASTRO ARC Anglo-Australian Observatory 2022 http://dx.doi.org/10.1093/mnras/stac1841 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac1841/44422064/stac1841.pdf https://academic.oup.com/mnras/article-pdf/515/1/984/45475082/stac1841.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Monthly Notices of the Royal Astronomical Society volume 515, issue 1, page 984-997 ISSN 0035-8711 1365-2966 Space and Planetary Science Astronomy and Astrophysics journal-article 2022 croxfordunivpr https://doi.org/10.1093/mnras/stac1841 2023-12-15T09:43:03Z ABSTRACT Using data from the SAMI Galaxy Survey, we investigate the correlation between the projected stellar kinematic spin vector of 1397 SAMI galaxies and the line-of-sight motion of their neighbouring galaxies. We calculate the luminosity-weighted mean velocity difference between SAMI galaxies and their neighbours in the direction perpendicular to the SAMI galaxies’ angular momentum axes. The luminosity-weighted mean velocity offset between SAMI galaxies and neighbours, which indicates the signal of coherence between the rotation of the SAMI galaxies and the motion of neighbours, is 9.0 ± 5.4 km s−1 (1.7σ) for neighbours within 1 Mpc. In a large-scale analysis, we find that the average velocity offsets increase for neighbours out to 2 Mpc. However, the velocities are consistent with zero or negative for neighbours outside 3 Mpc. The negative signals for neighbours at a distance around 10 Mpc are also significant at the ∼2σ level, which indicate that the positive signals within 2 Mpc might come from the variance of large-scale structure. We also calculate average velocities of different subsamples, including galaxies in different regions of the sky, galaxies with different stellar masses, galaxy type, λRe, and inclination. Although subsamples of low-mass, high-mass, early-type, and low-spin galaxies show the 2–3σ signal of coherence for the neighbours within 2 Mpc, the results for different inclination subsamples and large-scale results suggest that the ∼2σ signals might result from coincidental scatter or variance of large-scale structure. Overall, the modest evidence of coherence signals for neighbouring galaxies within 2 Mpc needs to be confirmed by larger samples of observations and simulation studies. Article in Journal/Newspaper sami Oxford University Press (via Crossref) Monthly Notices of the Royal Astronomical Society 515 1 984 997 |
institution |
Open Polar |
collection |
Oxford University Press (via Crossref) |
op_collection_id |
croxfordunivpr |
language |
English |
topic |
Space and Planetary Science Astronomy and Astrophysics |
spellingShingle |
Space and Planetary Science Astronomy and Astrophysics Mai, Yifan Vaughan, Sam P Croom, Scott M van de Sande, Jesse Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J Colless, Matthew Goodwin, Michael Groves, Brent Konstantopoulos, Iraklis S Lawrence, Jon S Lorente, Nuria P F Richards, Samuel N The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours |
topic_facet |
Space and Planetary Science Astronomy and Astrophysics |
description |
ABSTRACT Using data from the SAMI Galaxy Survey, we investigate the correlation between the projected stellar kinematic spin vector of 1397 SAMI galaxies and the line-of-sight motion of their neighbouring galaxies. We calculate the luminosity-weighted mean velocity difference between SAMI galaxies and their neighbours in the direction perpendicular to the SAMI galaxies’ angular momentum axes. The luminosity-weighted mean velocity offset between SAMI galaxies and neighbours, which indicates the signal of coherence between the rotation of the SAMI galaxies and the motion of neighbours, is 9.0 ± 5.4 km s−1 (1.7σ) for neighbours within 1 Mpc. In a large-scale analysis, we find that the average velocity offsets increase for neighbours out to 2 Mpc. However, the velocities are consistent with zero or negative for neighbours outside 3 Mpc. The negative signals for neighbours at a distance around 10 Mpc are also significant at the ∼2σ level, which indicate that the positive signals within 2 Mpc might come from the variance of large-scale structure. We also calculate average velocities of different subsamples, including galaxies in different regions of the sky, galaxies with different stellar masses, galaxy type, λRe, and inclination. Although subsamples of low-mass, high-mass, early-type, and low-spin galaxies show the 2–3σ signal of coherence for the neighbours within 2 Mpc, the results for different inclination subsamples and large-scale results suggest that the ∼2σ signals might result from coincidental scatter or variance of large-scale structure. Overall, the modest evidence of coherence signals for neighbouring galaxies within 2 Mpc needs to be confirmed by larger samples of observations and simulation studies. |
author2 |
Australian Research Council CAASTRO ARC Anglo-Australian Observatory |
format |
Article in Journal/Newspaper |
author |
Mai, Yifan Vaughan, Sam P Croom, Scott M van de Sande, Jesse Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J Colless, Matthew Goodwin, Michael Groves, Brent Konstantopoulos, Iraklis S Lawrence, Jon S Lorente, Nuria P F Richards, Samuel N |
author_facet |
Mai, Yifan Vaughan, Sam P Croom, Scott M van de Sande, Jesse Barsanti, Stefania Bland-Hawthorn, Joss Brough, Sarah Bryant, Julia J Colless, Matthew Goodwin, Michael Groves, Brent Konstantopoulos, Iraklis S Lawrence, Jon S Lorente, Nuria P F Richards, Samuel N |
author_sort |
Mai, Yifan |
title |
The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours |
title_short |
The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours |
title_full |
The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours |
title_fullStr |
The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours |
title_full_unstemmed |
The SAMI Galaxy Survey: the relationship between galaxy rotation and the motion of neighbours |
title_sort |
sami galaxy survey: the relationship between galaxy rotation and the motion of neighbours |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/mnras/stac1841 https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac1841/44422064/stac1841.pdf https://academic.oup.com/mnras/article-pdf/515/1/984/45475082/stac1841.pdf |
genre |
sami |
genre_facet |
sami |
op_source |
Monthly Notices of the Royal Astronomical Society volume 515, issue 1, page 984-997 ISSN 0035-8711 1365-2966 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/mnras/stac1841 |
container_title |
Monthly Notices of the Royal Astronomical Society |
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515 |
container_issue |
1 |
container_start_page |
984 |
op_container_end_page |
997 |
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1788065015483334656 |