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Dynamics of the elliptical galaxy NGC 4697 from integrated light and PNe

Dynamics of the elliptical galaxy NGC 4697 from integrated light and PNe. Niranjan Sambhus , Flavio De Lorenzi, Ortwin Gerhard (Basel). Science Issues:. internal dynamics of normal ellipticals, extended to outer regions content and distribution of dark matter in halos of such galaxies

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Dynamics of the elliptical galaxy NGC 4697 from integrated light and PNe

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

  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

  8. 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.

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