A 3D map of the Milky Way's disk as traced by classical Cepheids

Xiaodian Chen, Shu Wang, Licai Deng, Richard De Grijs, Chao Liu, Hao Tian

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review


We have collected 2330 Cepheids to establish an intuitive 3D map of the Milky Way's disk. As regards the warp amplitude, the Cepheid disk agrees well with the gas disk for radii up to 15 kpc. However, the mean line of nodes (LON) of the Cepheid disk deviates from the Galactic Center-Sun direction by 17.5±1.0°. This is a new and different result compared with previous results. The LON is not stable at any given radius, but it twists. The twisted pattern suggests that the formation of the Milky Way's warp is dominated by the massive inner disk. The kinematic warp defined by the Cepheids is also in concordance with the spatial warp. In the 2020 era, the anticipated increasing number of new Cepheids will provide a key opportunity to view our Milky Way's disk as a whole, and we expect that our knowledge of the disk's main structural features will be much improved.

Original languageEnglish
Title of host publicationGalactic Dynamics in the Era of Large Surveys
Subtitle of host publicationProceedings of the 353rd Symposium of the International Astronomical Union held In Shanghai, China, 30 June–5 July, 2019
EditorsMonica Valluri, J. A. Sellwood
Place of PublicationCambridge
PublisherCambridge University Press (CUP)
Number of pages4
ISBN (Print)9781108482486
Publication statusPublished - 2020
Event353rd Symposium of the International Astronomical Union - Shanghai, China
Duration: 30 Jun 20195 Jul 2019

Publication series

NameProceedings of the International Astronomical Union
PublisherCambridge University Press
ISSN (Print)1743-9213


Conference353rd Symposium of the International Astronomical Union


  • Galaxy: disk
  • Galaxy: structure
  • stars: distances
  • stars: variables: Cepheids


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