Deep Fabry-Perot Halpha Observations of NGC 7793: a Very Extended Halpha Disk and a Truly Declining Rotation Curve - AstrophysicsReportar como inadecuado




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Abstract: Deep Halpha observations of the Sculptor Group galaxy NGC 7793 were obtainedon the ESO 3.60m and the Marseille 36cm telescopes at La Silla, Chile. Halphaemission is detected all the way to the edge of the HI disk, making of the HIIdisk of NGC 7793 one of the largest ever observed in a quiet non-AGN late-typesystem. Even in the very outer parts, the HII ionizing sources are probablymainly internal massive stars in the disk with an unlikely contribution fromthe extragalactic ionizing background. The Halpha kinematics confirms what hadalready been seen with the HI observations: NGC 7793 has a truly decliningrotation curve. However, the decline is not Keplerian and a dark halo is stillneeded to explain the rotation velocities in the outer parts.



Autor: I. Dicaire 1, C. Carignan 1, P. Amram 2, M. Marcelin 2, J. Hlavacek-Larrondo 1, M.-M. de Denus-Baillargeon 1, O. Daigle 1,2, O. H

Fuente: https://arxiv.org/







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