For refcode 2013MNRAS.432.1709C: Retrieve 260 NED objects in this reference. Please click here for ADS abstract
NED Abstract
Copyright by Royal Astronomical Society.
2013MNRAS.432.1709C
The ATLAS^3D^ project  XV. Benchmark for earlytype galaxies scaling
relations from 260 dynamical models: masstolight ratio, dark matter,
Fundamental Plane and Mass Plane
Cappellari, Michele; Scott, Nicholas; Alatalo, Katherine; Blitz, Leo;
Bois, Maxime; Bournaud, Frederic; Bureau, M.; Crocker, Alison F.; Davies,
Roger L.; Davis, Timothy A.; de Zeeuw, P. T.; Duc, PierreAlain; Emsellem,
Eric; Khochfar, Sadegh; Krajnovic, Davor; Kuntschner, Harald; McDermid,
Richard M.; Morganti, Raffaella; Naab, Thorsten; Oosterloo, Tom; Sarzi,
Marc; Serra, Paolo; Weijmans, AnneMarie; Young, Lisa M.
Abstract. We study the volumelimited and nearly massselected (stellar
mass M_stars_ >~ 6 x 10^9^ M_sun_) ATLAS^3D^ sample of 260 earlytype
galaxies (ETGs, ellipticals Es and lenticulars S0s). We construct detailed
axisymmetric dynamical models (Jeans Anisotropic MGE), which allow for
orbital anisotropy, include a dark matter halo and reproduce in detail
both the galaxy images and the highquality integralfield stellar
kinematics out to about 1R_e_, the projected halflight radius. We derive
accurate total masstolight ratios (M/L)_e_ and dark matter fractions
f_DM_, within a sphere of radius r={R_e} centred on the galaxies. We also
measure the stellar (M/L)_stars_ and derive a median dark matter fraction
f_DM_ = 13 per cent in our sample. We infer masses M_JAM_ = L x (M/L)_e_ ~
2 x M_1/2_, where M_1/2_ is the total mass within a sphere enclosing half
of the galaxy light. We find that the thin twodimensional subset spanned
by galaxies in the (M_JAM,sigma_e,R_e^maj) coordinates system, which we
call the Mass Plane (MP) has an observed rms scatter of 19 per cent, which
implies an intrinsic one of 11 per cent. Here, R_e^maj is the major axis
of an isophote enclosing half of the observed galaxy light, while sigma_e_
is measured within that isophote. The MP satisfies the scalar virial
relation M_JAM is proportional to sigma_e^2 R_e^maj within our tight
errors. This show that the larger scatter in the Fundamental Plane (FP)
(L, sigma_e_, R_e_) is due to stellar population effects [including trends
in the stellar initial mass function (IMF)]. It confirms that the FP
deviation from the virial exponents is due to a genuine (M/L)_e_
variation. However, the details of how both R_e_ and sigma_e_ are
determined are critical in defining the precise deviation from the virial
exponents. The main uncertainty in masses or M/L estimates using the
scalar virial relation is in the measurement of R_e_. This problem is
already relevant for nearby galaxies and may cause significant biases in
virial mass and size determinations at high redshift. Dynamical models can
eliminate these problems. We revisit the (M/L)_e_sigma_e_ relation, which
describes most of the deviations between the MP and the FP. The
bestfitting relation is (M/L)_e is proportional to sigma_e^{0.72} (r
band). It provides an upper limit to any systematic increase of the IMF
mass normalization with sigma_e_. The correlation is more shallow and has
smaller scatter for slow rotating systems or for galaxies in Virgo. For
the latter, when using the best distance estimates, we observe a scatter
in (M/L)_e_ of 11 per cent, and infer an intrinsic one of 8 per cent. We
perform an accurate empirical study of the link between sigma_e_ and the
galaxies circular velocity V_circ_ within 1R_e_ (where stars dominate) and
find the relation max (V_circ_) ~ 1.76 x sigma_e_, which has an observed
scatter of 7 per cent. The accurate parameters described in this paper are
used in the companion Paper XX (Cappellari et al.) of this series to
explore the variation of global galaxy properties, including the IMF, on
the projections of the MP.
Key words: galaxies: elliptical and lenticular, cD, galaxies: evolution,
galaxies: formation, galaxies: kinematics and dynamics, galaxies:
structure
Retrieve 260 NED objects in this reference. Please click here for ADS abstract
