VIMOS mosaic integral-field spectroscopy of the bulge and disc of the early-type galaxy NGC 4697

摘要: We present an integral field study of the internal structure, kinematics and stellar population almost edge-on, intermediate luminosity ($L_ {*}$) elliptical galaxy NGC 4697. build extended 2-dimensional (2D) maps line-strengths up to $\sim 0.7 $ effective radii (R$_{eff}$) using a mosaic 8 VIMOS (VIsible Multi-Objects Spectrograph on VLT) integral-field unit pointings. find clear evidence for rotation-supported structure along major axis from 2D kinematical maps, confirming previous classification this system as `fast-rotator'. correlations between third fourth Gauss-Hermite moments line-of-sight velocity distribution (LOSVD) $h_3$ $h_4$ with rotation parameter ($V/\sigma$), compare our findings hydrodynamical simulations. remarkable similarities predictions gas-rich mergers. Based photometry, we perform bulge/disk decomposition properties two components. The bulge disk show different populations, stars in being older (age$_{\rm bulge}=13.5^{+1.4}_{-1.4}$ Gyr, age$_{\rm disk}=10.5^{+1.6}_{-2.0}$Gyr) more metal-poor ($\mathrm{[M/H]_{bulge}} = -0.17^{+0.12}_{-0.1}$, $\mathrm{[M/H]_{disk}}=-0.03^{+0.02}_{-0.1}$). later-formed, metal-rich embedded older, bulge, together LOSVD supports mass assembly scenario dominated by minor mergers possibly late merger that left previously rapidly rotating unchanged. do not signs Initial Mass Function slopes, both match well Milky Way-like IMF.