1. Niranjan Sambhus, Flavio De Lorenzi, Ortwin Gerhard (Basel)
Dynamics of the elliptical galaxy NGC 4697 from integrated light and PNe
Niranjan Sambhus,
Flavio De Lorenzi, Ortwin Gerhard
(Basel)

2. Science Issues:
internal dynamics of normal ellipticals, extended to outer regions
content and distribution of dark matter in halos of such galaxies
NGC 4697:
E4 elliptical, D = 10.5 Mpc
Presence of inner disk
Lack of large scale gas
distribution at outer radii
Axisymmetric light profile
Inclination close to edge-on
Kinematic data for 500 PNes
extending upto 3 Reff

3. Deprojecting the galaxy:
Assumption:
Density approximated as an oblate axisymmetric spheroid, seen edge-on
Method:
Deconvolution using RL algorithm
major axis
minor axis

4. Mass modeling M2M: Self-consistent N-body code (Syer-
Tremaine algorithm)
Mass-to-light ratio
Input: Spherical harmonic
decomposition of density
profile
Kinematic observables as
constraints

5. Planetary Nebulae in NGC 4697
PNes: Kinematic indicators of underlying stellar distribution.
Non-parametric recovery of a smooth mean velocity distribution, consistent with errors.

6. PNe Kinematics

7. Kinematics: PNe, Absorption lines, and N-body model

9. Results till date... Best-fit (M/L)R ~ 7.7 (not conclusive, though)
Equatorial plane kinematics affected by inner disk
Except along major axis, PNe velocity field appears to match the absorption line data, as well as the N-body model (without DM).
Need ....
to ascertain the PNe kinematic fields
to incorporate disk in the N-body model and
check the contribution from DM, if at all.