The impact of AGN on stellar kinematics and orbits in simulated massive galaxies

Matteo Frigo; Thorsten Naab; Michaela Hirschmann; Ena Choi; Rachel S. Somerville; Davor Krajnovic; Romeel Dave; Michele Cappellari

doi:10.1093/mnras/stz2318

The impact of AGN on stellar kinematics and orbits in simulated massive galaxies

Matteo Frigo, Thorsten Naab, Michaela Hirschmann, Ena Choi, Rachel S. Somerville, Davor Krajnovic, Romeel Dave, Michele Cappellari

DARK

8 Citations (Scopus)

Abstract

We present a series of 10 × 2 cosmological zoom simulations of the formation of massive galaxies with and without a model for active galactic nucleus (AGN) feedback. Differences in stellar population and kinematic properties are evaluated by constructing mock integral field unit maps. The impact of the AGN is weak at high redshift when all systems are mostly fast rotating and disc-like. After z ∼ 1 the AGN simulations result in lower mass, older, less metal rich, and slower rotating systems with less discy isophotes - in general agreement with observations. 2D kinematic maps of in situ and accreted stars show that these differences result from reduced in-situ star formation due to AGN feedback. A full analysis of stellar orbits indicates that galaxies simulated with AGN are typically more triaxial and have higher fractions of x-tubes and box orbits and lower fractions of z-tubes. This trend can also be explained by reduced late in-situ star formation. We introduce a global parameter, ξ 3, to characterize the anticorrelation between the third-order kinematic moment h3 and the lineof- sight velocity (Vavg/σ), and compare to ATLAS3D observations. The kinematic correlation parameter ξ 3 might be a useful diagnostic for large integral field surveys as it is a kinematic indicator for intrinsic shape and orbital content.

Original language	English
Journal	Monthly Notices of the Royal Astronomical Society
Volume	489
Issue number	2
Pages (from-to)	2702-2722
ISSN	0035-8711
DOIs	https://doi.org/10.1093/mnras/stz2318
Publication status	Published - 21 Oct 2019

Keywords

methods: numerical
galaxies: evolution
galaxies: formation
galaxies: kinematics and dynamics

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title = "The impact of AGN on stellar kinematics and orbits in simulated massive galaxies",

abstract = "We present a series of 10 × 2 cosmological zoom simulations of the formation of massive galaxies with and without a model for active galactic nucleus (AGN) feedback. Differences in stellar population and kinematic properties are evaluated by constructing mock integral field unit maps. The impact of the AGN is weak at high redshift when all systems are mostly fast rotating and disc-like. After z ∼ 1 the AGN simulations result in lower mass, older, less metal rich, and slower rotating systems with less discy isophotes - in general agreement with observations. 2D kinematic maps of in situ and accreted stars show that these differences result from reduced in-situ star formation due to AGN feedback. A full analysis of stellar orbits indicates that galaxies simulated with AGN are typically more triaxial and have higher fractions of x-tubes and box orbits and lower fractions of z-tubes. This trend can also be explained by reduced late in-situ star formation. We introduce a global parameter, ξ 3, to characterize the anticorrelation between the third-order kinematic moment h3 and the lineof- sight velocity (Vavg/σ), and compare to ATLAS3D observations. The kinematic correlation parameter ξ 3 might be a useful diagnostic for large integral field surveys as it is a kinematic indicator for intrinsic shape and orbital content.",

keywords = "methods: numerical, galaxies: evolution, galaxies: formation, galaxies: kinematics and dynamics",

author = "Matteo Frigo and Thorsten Naab and Michaela Hirschmann and Ena Choi and Somerville, {Rachel S.} and Davor Krajnovic and Romeel Dave and Michele Cappellari",

year = "2019",

month = oct,

day = "21",

doi = "10.1093/mnras/stz2318",

language = "English",

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TY - JOUR

T1 - The impact of AGN on stellar kinematics and orbits in simulated massive galaxies

AU - Frigo, Matteo

AU - Naab, Thorsten

AU - Hirschmann, Michaela

AU - Choi, Ena

AU - Somerville, Rachel S.

AU - Krajnovic, Davor

AU - Dave, Romeel

AU - Cappellari, Michele

PY - 2019/10/21

Y1 - 2019/10/21

N2 - We present a series of 10 × 2 cosmological zoom simulations of the formation of massive galaxies with and without a model for active galactic nucleus (AGN) feedback. Differences in stellar population and kinematic properties are evaluated by constructing mock integral field unit maps. The impact of the AGN is weak at high redshift when all systems are mostly fast rotating and disc-like. After z ∼ 1 the AGN simulations result in lower mass, older, less metal rich, and slower rotating systems with less discy isophotes - in general agreement with observations. 2D kinematic maps of in situ and accreted stars show that these differences result from reduced in-situ star formation due to AGN feedback. A full analysis of stellar orbits indicates that galaxies simulated with AGN are typically more triaxial and have higher fractions of x-tubes and box orbits and lower fractions of z-tubes. This trend can also be explained by reduced late in-situ star formation. We introduce a global parameter, ξ 3, to characterize the anticorrelation between the third-order kinematic moment h3 and the lineof- sight velocity (Vavg/σ), and compare to ATLAS3D observations. The kinematic correlation parameter ξ 3 might be a useful diagnostic for large integral field surveys as it is a kinematic indicator for intrinsic shape and orbital content.

AB - We present a series of 10 × 2 cosmological zoom simulations of the formation of massive galaxies with and without a model for active galactic nucleus (AGN) feedback. Differences in stellar population and kinematic properties are evaluated by constructing mock integral field unit maps. The impact of the AGN is weak at high redshift when all systems are mostly fast rotating and disc-like. After z ∼ 1 the AGN simulations result in lower mass, older, less metal rich, and slower rotating systems with less discy isophotes - in general agreement with observations. 2D kinematic maps of in situ and accreted stars show that these differences result from reduced in-situ star formation due to AGN feedback. A full analysis of stellar orbits indicates that galaxies simulated with AGN are typically more triaxial and have higher fractions of x-tubes and box orbits and lower fractions of z-tubes. This trend can also be explained by reduced late in-situ star formation. We introduce a global parameter, ξ 3, to characterize the anticorrelation between the third-order kinematic moment h3 and the lineof- sight velocity (Vavg/σ), and compare to ATLAS3D observations. The kinematic correlation parameter ξ 3 might be a useful diagnostic for large integral field surveys as it is a kinematic indicator for intrinsic shape and orbital content.

KW - methods: numerical

KW - galaxies: evolution

KW - galaxies: formation

KW - galaxies: kinematics and dynamics

U2 - 10.1093/mnras/stz2318

DO - 10.1093/mnras/stz2318

M3 - Journal article

SN - 0035-8711

VL - 489

SP - 2702

EP - 2722

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 2

ER -

The impact of AGN on stellar kinematics and orbits in simulated massive galaxies

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Keywords

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