1 / 9

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

drodgers
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related