Are the Milky Way and Andromeda unusual? A comparison with Milky Way and Andromeda analogues

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dc.contributor.authorBoardman, N.
dc.contributor.authorZasowski, G.
dc.contributor.authorNewman, J. A.
dc.contributor.authorAndrews, B.
dc.contributor.authorFielder, C.
dc.contributor.authorBershady, M.
dc.contributor.authorBrinkmann, J.
dc.contributor.authorDrory, N.
dc.contributor.authorKrishnarao, D.
dc.contributor.authorLane, R. R.
dc.contributor.authorMackereth, T.
dc.contributor.authorMasters, K.
dc.contributor.authorStringfellow, G. S.
dc.date.accessioned2025-01-23T19:47:35Z
dc.date.available2025-01-23T19:47:35Z
dc.date.issued2020
dc.description.abstractOur Milky Way provides a unique test case for galaxy evolution models because of our privileged position within the Milky Way's disc. This position also complicates comparisons between the Milky Way and external galaxies, due to our inability to observe the Milky Way from an external point of view. Milky Way analogue galaxies offer us a chance to bridge this divide by providing the external perspective that we otherwise lack. However, overprecise definitions of 'analogue' yield little-to-no galaxies, so it is vital to understand which selection criteria produce the most meaningful analogue samples. To address this, we compare the properties of complementary samples of Milky Way analogues selected using different criteria. We find the Milky Way to be within 1 sigma of its analogues in terms of star formation rate and bulge-to-total ratio in most cases, but we find larger offsets between the Milky Way and its analogues in terms of disc scale length; this suggests that scale length must be included in analogue selections in addition to other criteria if the most accurate analogues are to be selected. We also apply our methodology to the neighbouring Andromeda galaxy. We find analogues selected on the basis of strong morphological features to display much higher star formation rates than Andromeda, and we also find analogues selected on Andromeda's star formation rate to overpredict Andromeda's bulge extent. This suggests both structure and star formation rate should be considered when selecting the most stringent Andromeda analogues.
dc.description.funderCenter for High Performance Computing at the University of Utah
dc.fuente.origenWOS
dc.identifier.doi10.1093/mnras/staa2731
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://doi.org/10.1093/mnras/staa2731
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100394
dc.identifier.wosidWOS:000587755500022
dc.issue.numero4
dc.language.isoen
dc.pagina.final4954
dc.pagina.inicio4943
dc.revistaMonthly notices of the royal astronomical society
dc.rightsacceso restringido
dc.subjectgalaxies: general
dc.subjectgalaxies: spiral
dc.subjectgalaxies: statistics
dc.subjectgalaxies: stellar content
dc.subjectgalaxies: structure
dc.subjectGalaxy: general
dc.titleAre the Milky Way and Andromeda unusual? A comparison with Milky Way and Andromeda analogues
dc.typeartículo
dc.volumen498
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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