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

Zhu, L., Ven, G. v. d., Bosch, R. v. d., Rix, H.-W., Lyubenova, M., Falcón-Barroso, J., et al. (2018). The stellar orbit distribution in present-day galaxies inferred from the CALIFA survey. Nature Astronomy, 2, 233-238.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CA12-3 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CA13-2
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2018NatAs...2..233Z (Any fulltext)
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 Creators:
Zhu, Ling1, Author
Ven, Glenn van de1, Author
Bosch, Remco van den1, Author
Rix, Hans-Walter1, Author
Lyubenova, Mariya1, Author
Falcón-Barroso, Jesús1, Author
Martig, Marie1, Author
Mao, Shude1, Author
Xu, Dandan1, Author
Jin, Yunpeng1, Author
Obreja, Aura1, Author
Grand, Robert J. J.1, Author
Dutton, Aaron A.1, Author
Macciò, Andrea V.1, Author
Gómez, Facundo A.1, Author
Walcher, Jakob C.1, Author
García-Benito, Rubén1, Author
Zibetti, Stefano1, Author
Sánchez, Sebastian F.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: Astrophysics - Astrophysics of Galaxies
 Abstract: Galaxy formation entails the hierarchical assembly of mass, along with the condensation of baryons and the ensuing, self-regulating star formation1,2. The stars form a collisionless system whose orbit distribution retains dynamical memory that can constrain a galaxy's formation history3. The orbits dominated by ordered rotation, with near-maximum circularity λz ≈ 1, are called kinematically cold, and the orbits dominated by random motion, with low circularity λz ≈ 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 histories4,5. 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 survey6, 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 ≤ λz ≤ 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.

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 Dates: 2018
 Publication Status: Issued
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Title: Nature Astronomy
Source Genre: Journal
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Pages: - Volume / Issue: 2 Sequence Number: - Start / End Page: 233 - 238 Identifier: -