The kinematics of the hot gas in the nuclear region of NGC 1365

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Spectroscopy, Barred Galaxies, Galactic Nuclei, Interstellar Gas, Seyfert Galaxies, Astronomical Models, Charge Coupled Devices, High Temperature Gases, Kinematics, Radial Velocity, Velocity Distribution

Scientific paper

A number of new, high quality digital spectra confirm the peculiar velocity field previously derived from the forbidden O III lines in the nuclear region of NGC 1365. The forbidden Ne III line is found to behave similarly, and the hot medium producing these lines appears to form a separate dynamic entity. This hot gas has a velocity component towards the observer (systemic relative) in all the observed position angles, which is about zero at the nucleus and increases with angular distance from the nucleus. There is no simple way of explaining such a velocity field in terms of motion in a plane. Instead, a model is presented which assumes perpendicular outflow from the plane of the galaxy. This model fits the data well, but the physical reasons for such a flow are not clear.

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