The stellar orbit distribution in present-day galaxies inferred from the CALIFA survey

Ling Zhu, Glenn Van De Ven, Remco Van Den Bosch, Hans Walter Rix, Mariya Lyubenova, Jesús Falcón-Barroso, Marie Martig, Shude Mao, Dandan Xu, Yunpeng Jin, Aura Obreja, Robert J.J. Grand, Aaron A. Dutton, Andrea Maccio, Facundo A. Gómez, Jakob C. Walcher, Rubén García-Benito, Stefano Zibetti, Sebastian F. Sánchez

Research output: Contribution to journalArticle

Abstract

Galaxy formation entails the hierarchical assembly of mass, along with the condensation of baryons and the ensuing, self-regulating star formation 1,2 . The stars form a collisionless system whose orbit distribution retains dynamical memory that can constrain a galaxy's formation history 3 . The orbits dominated by ordered rotation, with near-maximum circularity λ z ≈ 1, are called kinematically cold, and the orbits dominated by random motion, with low circularity λ z ≈ 0, are kinematically hot. The fraction of stars on 'cold' orbits, compared with the fraction on 'hot' orbits, speaks directly to the quiescence or violence of the galaxies' formation histories 4,5 . Here we present such orbit distributions, derived from stellar kinematic maps through orbit-based modelling for a well-defined, large sample of 300 nearby galaxies. The sample, drawn from the CALIFA survey 6, includes the main morphological galaxy types and spans a total stellar mass range from 108.7 to 1011.9 solar masses. Our analysis derives the orbit-circularity distribution as a function of galaxy mass and its volume-averaged total distribution. We find that across most of the considered mass range and across morphological types, there are more stars on 'warm' orbits defined as 0.25 ≤ λ z ≤ 0.8 than on either 'cold' or 'hot' orbits. This orbit-based 'Hubble diagram' provides a benchmark for galaxy formation simulations in a cosmological context.

Original languageEnglish (US)
Pages (from-to)233-238
Number of pages6
JournalNature Astronomy
Volume2
Issue number3
DOIs
StatePublished - Mar 1 2018

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stellar orbits
galaxies
orbits
galactic evolution
stars
violence
histories
Hubble diagram
automatic control
stellar mass
star formation
baryons

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Zhu, L., Ven, G. V. D., Bosch, R. V. D., Rix, H. W., Lyubenova, M., Falcón-Barroso, J., ... Sánchez, S. F. (2018). The stellar orbit distribution in present-day galaxies inferred from the CALIFA survey. Nature Astronomy, 2(3), 233-238. https://doi.org/10.1038/s41550-017-0348-1

The stellar orbit distribution in present-day galaxies inferred from the CALIFA survey. / Zhu, Ling; Ven, Glenn Van De; Bosch, Remco Van Den; Rix, Hans Walter; Lyubenova, Mariya; Falcón-Barroso, Jesús; Martig, Marie; Mao, Shude; Xu, Dandan; Jin, Yunpeng; Obreja, Aura; Grand, Robert J.J.; Dutton, Aaron A.; Maccio, Andrea; Gómez, Facundo A.; Walcher, Jakob C.; García-Benito, Rubén; Zibetti, Stefano; Sánchez, Sebastian F.

In: Nature Astronomy, Vol. 2, No. 3, 01.03.2018, p. 233-238.

Research output: Contribution to journalArticle

Zhu, L, Ven, GVD, Bosch, RVD, Rix, HW, Lyubenova, M, Falcón-Barroso, J, Martig, M, Mao, S, Xu, D, Jin, Y, Obreja, A, Grand, RJJ, Dutton, AA, Maccio, A, Gómez, FA, Walcher, JC, García-Benito, R, Zibetti, S & Sánchez, SF 2018, 'The stellar orbit distribution in present-day galaxies inferred from the CALIFA survey', Nature Astronomy, vol. 2, no. 3, pp. 233-238. https://doi.org/10.1038/s41550-017-0348-1
Zhu L, Ven GVD, Bosch RVD, Rix HW, Lyubenova M, Falcón-Barroso J et al. The stellar orbit distribution in present-day galaxies inferred from the CALIFA survey. Nature Astronomy. 2018 Mar 1;2(3):233-238. https://doi.org/10.1038/s41550-017-0348-1
Zhu, Ling ; Ven, Glenn Van De ; Bosch, Remco Van Den ; Rix, Hans Walter ; Lyubenova, Mariya ; Falcón-Barroso, Jesús ; Martig, Marie ; Mao, Shude ; Xu, Dandan ; Jin, Yunpeng ; Obreja, Aura ; Grand, Robert J.J. ; Dutton, Aaron A. ; Maccio, Andrea ; Gómez, Facundo A. ; Walcher, Jakob C. ; García-Benito, Rubén ; Zibetti, Stefano ; Sánchez, Sebastian F. / The stellar orbit distribution in present-day galaxies inferred from the CALIFA survey. In: Nature Astronomy. 2018 ; Vol. 2, No. 3. pp. 233-238.
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