Warp and flare of the Galactic disc revealed with supergiants by Gaia EDR3

Chrobáková, Ž.; Nagy, R.; López-Corredoira, M.
Referencia bibliográfica

Astronomy and Astrophysics

Fecha de publicación:
Número de autores
Número de autores del IAC
Número de citas
Número de citas referidas
Context. The outer Galactic disc contains some features such as the warp and flare, whose origin is still debated. The Gaia data provide an excellent opportunity to probe the Galactic disc at large distances and study these features.
Aims: We derive the density distributions of the average (old) whole population and the supergiants (representative of a young population), and we use them to constrain their warp and flare. By comparing the results, we study how the properties of these phenomena depend on the studied population.
Methods: We used Lucy's deconvolution method to recover corrected star counts as a function of distance, from which we derive the density distribution.
Results: We find that supergiants have an asymmetric warp, reaching a maximum amplitude of zw = 0.658 kpc and minimum amplitude of zw = −0.717 kpc at a distance of R = [19.5, 20] kpc, which is almost twice as high as the amplitude of the whole population of the disc. We find a significant flare of the whole population, especially in the thick disc. The scale height increases from hz,thick ≈ 0.7 kpc and hz, thin ≈ 0.3 kpc in the solar neighbourhood, to hz, thick ≈ 2.6 kpc and hz, thin ≈ 0.6 kpc in the remote regions of the Milky Way (R ≈ 18 kpc). The supergiants' population has only a small flare.
Proyectos relacionados
Cúmulo Globular NGC 2808
Vía Láctea y galaxias cercanas

El objetivo general del Proyecto es el estudio de la estructura, historia evolutiva y proceso de formación de galaxias a través de sus poblaciones estelares resueltas, tanto a partir de fotometría como espectroscopia. El proyecto puede dividirse en cuatro líneas principales: I. Historia de formación estelar en el Grupo Local. El objetivo de esta

López Corredoira