For refcode 2018ApJ...860...81C: Retrieve 27 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by American Astronomical Society.
Reproduced by permission
2018ApJ...860...81C
Modeling Nearly Spherical Purebulge Galaxies with a Stellar Masstolight
Ratio Gradient under the LambdaCDM and MOND Paradigms. I. Methodology,
Dynamical Stellar Mass, and Fundamental Mass Plane
Chae, KyuHyun; Bernardi, Mariangela; Sheth, Ravi K.
Abstract. We carry out spherical Jeans modeling of nearly round
purebulge galaxies selected from the ATLAS^3D^ sample. Our modeling
allows for gradients in the stellar masstolight ratio (M_*_/L) through
analytic prescriptions parameterized with a "gradient strength" K
introduced to accommodate any viable gradient. We use a generalized
OsipkovMerritt model for the velocity dispersion (VD) anisotropy. We
produce Monte Carlo sets of models based on the stellar VD profiles under
both the LambdaCDM and MOND paradigms. Here, we describe the galaxy data,
the empirical inputs, and the modeling procedures of obtaining the Monte
Carlo sets. We then present the projected dynamical stellar mass,
{M}_\star {{e_}}, within the effective radius R_e_, and the fundamental
mass plane (FMP) as a function of K. We find the scaling of the
Kdependent mass with respect to the ATLAS^3D^ reported mass as:
{log}}_10_[{M}_\star {{e_}}(K)/{M}_\star {{e_}}^{{A^}3{{D}}}]=a' +b' K
with a' = 0.019 +/ 0.012 and b' = 0.18 +/ 0.02 (LambdaCDM), or a' =
0.023 +/ 0.014 and b' = 0.23 +/ 0.03 (MOND), for 0 <= K < 1.5. The FMP
has coefficients consistent with the virial expectation and only the
zeropoint scales with K. The median value of K for the ATLAS^3D^ galaxies
is < K> ={0.53}_0.04_^+0.05^. We perform a similar analysis of the much
larger SDSS DR7 spectroscopic sample. In this case, only the VD within a
single aperture is available, so we impose the additional requirement that
the VD slope be similar to that in the ATLAS^3D^ galaxies. Our analysis of
the SDSS galaxies suggests a positive correlation of K with stellar mass.
Key words: dark matter, galaxies: elliptical and lenticular, galaxies:
kinematics and dynamics, galaxies: structure, gravitation
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