Evidence of Two Kinematically Different Stellar Systems in NGC 1068

Details Evidence of Two Kinematically Different Stellar Systems in NGC 1068 Evidence of Two Kinematically Different Stellar Systems in NGC 1068

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...483l..99g&link_type=abstract

Astrophysical Journal Letters v.483, p.L99

Astronomy and Astrophysics

Astronomy

16

Galaxies: Individual Ngc Number: Ngc 1068, Galaxies: Kinematics And Dynamics, Galaxies: Seyfert

Scientific paper

We have obtained simultaneous two-dimensional spectroscopy of the Ca II triplet lines in the central 24" x 20" of NGC 1068, using an optical fiber system. The stellar velocity field derived from these data shows a kinematic off-centering between the inner (r < 3") and outer (r > 5") regions, indicative of a nonsymmetric gravitational potential. Both regions exhibit kinematic minor axes aligned with PA ~ 0 deg and could have similar systemic velocities. However, their kinematic centers are displaced by ~2."5. We propose that two kinematically different stellar systems rotating around parallel but shifted axes are present in NGC 1068. The origin of this peculiarity is discussed in relation to the gravitational potential of the galaxy and the hypothesis of a minor merger event.

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