Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-18
Astronomy and Astrophysics
Astrophysics
28 pages, 8 figures. Accepted for publication in AJ
Scientific paper
10.1088/0004-6256/135/6/2038
Deep Halpha observations of the Sculptor Group galaxy NGC 7793 were obtained on the ESO 3.60m and the Marseille 36cm telescopes at La Silla, Chile. Halpha emission is detected all the way to the edge of the HI disk, making of the HII disk of NGC 7793 one of the largest ever observed in a quiet non-AGN late-type system. Even in the very outer parts, the HII ionizing sources are probably mainly internal (massive stars in the disk) with an unlikely contribution from the extragalactic ionizing background. The Halpha kinematics confirms what had already been seen with the HI observations: NGC 7793 has a truly declining rotation curve. However, the decline is not Keplerian and a dark halo is still needed to explain the rotation velocities in the outer parts.
Amram Ph.
Carignan Claude
Daigle Olivier
de Denus-Baillargeon Marie-Maude
Dicaire I.
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