Artykuł w czasopiśmie
Brak miniatury
Licencja
 

Rotation Curve of the Milky Way from Classical Cepheids

Uproszczony widok
dc.abstract.enFlat rotation curves of spiral galaxies are considered as an evidence for dark matter, but the rotation curve of the Milky Way is difficult to measure. Various objects were used to track the rotation curve in the outer parts of the Galaxy, but most studies rely on incomplete kinematical information and inaccurate distances. Here, we use a sample of 773 Classical Cepheids with precise distances based on mid-infrared period-luminosity relations coupled with proper motions and radial velocities from Gaia to construct the accurate rotation curve of the Milky Way up to the distance of ∼20 kpc from the Galactic center. We use a simple model of Galactic rotation to measure the rotation speed of the Sun Θ<SUB>0</SUB> = 233.6 ± 2.8 km s<SUP>-1</SUP>, assuming a prior on the distance to the Galactic center R <SUB>0</SUB> = 8.122 ± 0.031 kpc from the GRAVITY Collaboration. The rotation curve at Galactocentric distances 4 ≲ R ≲ 20 kpc is nearly flat with a small gradient of -1.34 ± 0.21 km s<SUP>-1</SUP> kpc<SUP>-1</SUP>. This is the most accurate Galactic rotation curve at distances R > 12 kpc constructed so far.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMróz, Przemysław
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorSkowron, Dorota
dc.contributor.authorSkowron, Jan
dc.contributor.authorSoszyński, Igor
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSzymański, Michał
dc.contributor.authorPoleski, Radosław
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorUlaczyk, Krzysztof
dc.date.accessioned2024-01-25T19:28:35Z
dc.date.available2024-01-25T19:28:35Z
dc.date.copyright2018-10-04
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume870
dc.identifier.doi10.3847/2041-8213/AAF73F
dc.identifier.issn2041-8205
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/118793
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019ApJ...870L..10M
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal Letters
dc.relation.pagesL10
dc.rightsOther
dc.sciencecloudnosend
dc.titleRotation Curve of the Milky Way from Classical Cepheids
dc.typeJournalArticle
dspace.entity.typePublication