The SAMI galaxy survey: on the importance of applying multiple selection criteria for finding Milky Way analogues

ABSTRACT Milky Way analogues (MWAs) provide an alternative insight into the various pathways that lead to the formation of disc galaxies with similar properties to the Milky Way (MW). In this study, we explore different selection techniques for identifying MWAs in the Sydney-AAO (Australian Astronom...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2024-10, Vol.533 (4), p.4334-4359
Hauptverfasser: Tuntipong, Sujeeporn, van de Sande, Jesse, Croom, Scott M, Barsanti, Stefania, Bland-Hawthorn, Joss, Brough, Sarah, Bryant, Julia J, Casura, Sarah, Fraser-McKelvie, Amelia, Lawrence, Jon S, Ristea, Andrei, Sweet, Sarah M, Zafar, Tayyaba
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container_issue 4
container_start_page 4334
container_title Monthly notices of the Royal Astronomical Society
container_volume 533
creator Tuntipong, Sujeeporn
van de Sande, Jesse
Croom, Scott M
Barsanti, Stefania
Bland-Hawthorn, Joss
Brough, Sarah
Bryant, Julia J
Casura, Sarah
Fraser-McKelvie, Amelia
Lawrence, Jon S
Ristea, Andrei
Sweet, Sarah M
Zafar, Tayyaba
description ABSTRACT Milky Way analogues (MWAs) provide an alternative insight into the various pathways that lead to the formation of disc galaxies with similar properties to the Milky Way (MW). In this study, we explore different selection techniques for identifying MWAs in the Sydney-AAO (Australian Astronomical Observatory) Multi-object Integral field spectrograph (SAMI) Galaxy Survey. We utilize a nearest neighbours method to define MWAs using four selection parameters including stellar mass ($M_{\star }$), star formation rate ($\rm SFR$), bulge-to-total ratio ($B/T$), and disc effective radius ($R_{\rm {e}}$). Based on 15 different selection combinations, we find that including $M_{\star }$ and SFR is essential for minimizing biases in the average MWA properties as compared to the MW. Furthermore, given the MW’s smaller than average size, selection combinations without $R_{\rm {e}}$ result in MWAs being too large. Lastly, we find that $B/T$ is the least important parameter out of the four tested parameters. Using all four selection criteria, we define the top 10 most MW-like galaxies in the GAMA and Cluster regions of the SAMI survey. These most MW-like galaxies are typically barred spirals, with kinematically cold rotating discs and reside in a wide range of environments. Surprisingly, we find no significant differences between the MWAs selected from the GAMA and Cluster regions. Our work highlights the importance of using multiple selection criteria for finding MWAs and also demonstrates potential biases in previous MWA studies.
doi_str_mv 10.1093/mnras/stae2042
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subjects Bias
Celestial bodies
Criteria
Disk galaxies
Galactic clusters
Galactic rotation
Parameter identification
Rotating disks
Star & galaxy formation
Star formation rate
Stars & galaxies
Stellar mass
title The SAMI galaxy survey: on the importance of applying multiple selection criteria for finding Milky Way analogues
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