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Stellar systems following the R^1/m luminosity law, IV : the total energy and the central concentration of galaxies

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Abstract
We expand our previous analytical and numerical studies of the family of Sérsic models, which are routinely used to describe early-type galaxies and the bulges of spiral galaxies. In particular, we focus on the total energy budget, an important dynamical property that has not been discussed in detail in previous works. We use two different methods to calculate the total energy for the Sérsic model family that result in two independent expressions that can be used along the entire sequence of Sérsic models. We use these expressions to investigate whether the Spitzer concentration index is a reliable measure for the intrinsic 3D concentration of galaxies, and we conclude that it is not a very useful measure for the central concentration. The popular Third Galaxy Concentration index, on the other hand, is shown to be a reliable measure for the intrinsic 3D concentration, even though it is based on the surface brightness distribution and not on the intrinsic 3D density.
Keywords
galaxies: structure, galaxies: kinematics and dynamics, methods: analytical, ELLIPTIC GALAXIES, LIGHT CONCENTRATION, SURFACE PHOTOMETRY, STRUCTURAL PARAMETERS, SPHERICAL GALAXIES, FUNDAMENTAL PLANE, CLASSIFICATION, DECOMPOSITION, DENSITY, PROFILE

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Citation

Please use this url to cite or link to this publication:

MLA
Baes, Maarten, and Luca Ciotti. “Stellar Systems Following the R^1/m Luminosity Law, IV : The Total Energy and the Central Concentration of Galaxies.” ASTRONOMY & ASTROPHYSICS, vol. 630, 2019.
APA
Baes, M., & Ciotti, L. (2019). Stellar systems following the R^1/m luminosity law, IV : the total energy and the central concentration of galaxies. ASTRONOMY & ASTROPHYSICS, 630.
Chicago author-date
Baes, Maarten, and Luca Ciotti. 2019. “Stellar Systems Following the R^1/m Luminosity Law, IV : The Total Energy and the Central Concentration of Galaxies.” ASTRONOMY & ASTROPHYSICS 630.
Chicago author-date (all authors)
Baes, Maarten, and Luca Ciotti. 2019. “Stellar Systems Following the R^1/m Luminosity Law, IV : The Total Energy and the Central Concentration of Galaxies.” ASTRONOMY & ASTROPHYSICS 630.
Vancouver
1.
Baes M, Ciotti L. Stellar systems following the R^1/m luminosity law, IV : the total energy and the central concentration of galaxies. ASTRONOMY & ASTROPHYSICS. 2019;630.
IEEE
[1]
M. Baes and L. Ciotti, “Stellar systems following the R^1/m luminosity law, IV : the total energy and the central concentration of galaxies,” ASTRONOMY & ASTROPHYSICS, vol. 630, 2019.
@article{8641164,
  abstract     = {We expand our previous analytical and numerical studies of the family of Sérsic models, which are routinely used to describe early-type galaxies and the bulges of spiral galaxies. In particular, we focus on the total energy budget, an important dynamical property that has not been discussed in detail in previous works. We use two different methods to calculate the total energy for the Sérsic model family that result in two independent expressions that can be used along the entire sequence of Sérsic models. We use these expressions to investigate whether the Spitzer concentration index is a reliable measure for the intrinsic 3D concentration of galaxies, and we conclude that it is not a very useful measure for the central concentration. The popular Third Galaxy Concentration index, on the other hand, is shown to be a reliable measure for the intrinsic 3D concentration, even though it is based on the surface brightness distribution and not on the intrinsic 3D density.},
  articleno    = {A113},
  author       = {Baes, Maarten and Ciotti, Luca},
  issn         = {1432-0746},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {galaxies: structure,galaxies: kinematics and dynamics,methods: analytical,ELLIPTIC GALAXIES,LIGHT CONCENTRATION,SURFACE PHOTOMETRY,STRUCTURAL PARAMETERS,SPHERICAL GALAXIES,FUNDAMENTAL PLANE,CLASSIFICATION,DECOMPOSITION,DENSITY,PROFILE},
  language     = {eng},
  pages        = {8},
  title        = {Stellar systems following the R^1/m luminosity law, IV : the total energy and the central concentration of galaxies},
  url          = {http://dx.doi.org/10.1051/0004-6361/201936354},
  volume       = {630},
  year         = {2019},
}

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