The SAMI Galaxy Survey

Autor(en)

Giulia Santucci, Sarah Brough, Jesse van de Sande, Richard McDermid, Stefania Barsanti, Joss Bland-Hawthorn, Julia J. Bryant, Scott M. Croom, Claudia Lagos, Jon S. Lawrence, Matt S. Owers, Glenn van de Ven, Sam P. Vaughan, Sukyoung K. Yi

Abstrakt

Most dynamical models of galaxies to date assume axisymmetry, which is not representative of a significant fraction of massive galaxies. We have built triaxial orbit-superposition Schwarzschild models of galaxies observed by the SAMI Galaxy Survey, in order to reconstruct their inner orbital structure and mass distribution. The sample consists of 153 passive galaxies with total stellar masses in the range 10

^9.5 to 10

¹² M

_☉. We present an analysis of the internal structures and intrinsic properties of these galaxies as a function of their environment. We measure their environment using three proxies: central or satellite designation, halo mass and local 5th nearest neighbour galaxy density. We find that although these intrinsic properties correlate most strongly with stellar mass, environment does play a secondary role: at fixed stellar mass, galaxies in the densest regions are more radially anisotropic. In addition, central galaxies, and galaxies in high local densities show lower values of edge-on spin parameter proxy λ

_Re, EO. We also find suggestions of a possible trend of the fractions of orbits with environment for lower mass galaxies (between 10

^9.5 and 10

¹¹ M

_☉) such that, at fixed stellar mass, galaxies in higher local densities and halo mass have higher fractions of hot orbits and lower fractions of warm orbits. Our results demonstrate that after stellar mass, environment does play a role in shaping present-day passive galaxies.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

University of New South Wales, University of Western Australia, ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), The University of Sydney, Macquarie University, Australian National University, Swinburne University of Technology, Yonsei University

Journal

Monthly Notices of the Royal Astronomical Society

Band

521

Seiten

2671-2691

Anzahl der Seiten

21

ISSN

0035-8711

DOI

https://doi.org/10.1093/mnras/stad713

Publikationsdatum

05-2023

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/102692ef-4e76-4deb-a3eb-55d326624ab3