2018MNRAS.479..945Z -
Mon. Not. R. Astron. Soc., 479, 945-960 (2018/September-1)
Morphology and kinematics of orbital components in CALIFA galaxies across the Hubble sequence.
ZHU L., VAN DE VEN G., MENDEZ-ABREU J. and OBREJA A.
Abstract (from CDS):
Based on the stellar orbit distribution derived from orbit-superposition Schwarzschild models, we decompose each of 250 representative present-day galaxies into four orbital components: cold with strong rotation, warm with weak rotation, hot with dominant random motion, and counter-rotating (CR). We rebuild the surface brightness (Σ) of each orbital component and we present in figures and tables a quantification of their morphologies using the Sersic index n, concentration C = log(Σ0.1Re/ΣRe) and intrinsic flattening qRe and qRmax, with Re the half-light radius and Rmax the CALIFA data coverage. We find that: (1) kinematic hotter components are generally more concentrated and rounder than colder components, and (2) all components become more concentrated and thicker/rounder in more massive galaxies; they change from disc-like in low-mass late-type galaxies to bulge-like in high-mass early type galaxies. Our findings suggest that Sersic n is not a good discriminator between rotating bulges and non-rotating bulges. The luminosity fraction of cold orbits fcold is well correlated with the photometrically decomposed disc fractiondisc f_ disc_ as fcold = 0.14 + 0.23fdisc. Similarly, the hot orbit fraction fhot is correlated with the bulge fraction fbulge as fhot = 0.19 + 0.31fbulge. The warm orbits mainly contribute to discs in low-mass late-type galaxies, and to bulges in high-mass early-type galaxies. The cold, warm, and hot components generally follow the same morphology (ε = 1 - qRmax) versus kinematics (σz2/) relation as the thin disc, thick disc/pseudo-bulge, and classical bulge identified from cosmological simulations.
Abstract Copyright:
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
galaxies: bulges - galaxies: kinematics and dynamics - galaxies: structure
Simbad objects:
10
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