Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0802.2545)
· On-line Data
· References in the article
· Citations to the Article (3) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (16)
· NED Objects (2)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Deep Fabry-Perot Hα Observations of NGC 7793: A Very Extended Hα Disk and A Truly Declining Rotation Curve
Authors:
Dicaire, I.; Carignan, C.; Amram, P.; Marcelin, M.; Hlavacek-Larrondo, J.; de Denus-Baillargeon, M.-M.; Daigle, O.; Hernandez, O.
Affiliation:
AA(Laboratoire d'Astrophysique Expérimentale, Département de physique, Université de Montréal, C. P. 6128, Succ. centre-ville, Montréal, Qué. H3C 3J7, Canada ), AB(Laboratoire d'Astrophysique Expérimentale, Département de physique, Université de Montréal, C. P. 6128, Succ. centre-ville, Montréal, Qué. H3C 3J7, Canada ), AC(Laboratoire d'Astrophysique de Marseille, Observatoire Astronomique Marseille Provence, Université de Provence & CNRS, 2 place Le Verrier, F-13248 Marseille CEDEX 04, France), AD(Laboratoire d'Astrophysique de Marseille, Observatoire Astronomique Marseille Provence, Université de Provence & CNRS, 2 place Le Verrier, F-13248 Marseille CEDEX 04, France), AE(Laboratoire d'Astrophysique Expérimentale, Département de physique, Université de Montréal, C. P. 6128, Succ. centre-ville, Montréal, Qué. H3C 3J7, Canada ), AF(Laboratoire d'Astrophysique Expérimentale, Département de physique, Université de Montréal, C. P. 6128, Succ. centre-ville, Montréal, Qué. H3C 3J7, Canada ), AG(Laboratoire d'Astrophysique Expérimentale, Département de physique, Université de Montréal, C. P. 6128, Succ. centre-ville, Montréal, Qué. H3C 3J7, Canada ; Laboratoire d'Astrophysique de Marseille, Observatoire Astronomique Marseille Provence, Université de Provence & CNRS, 2 place Le Verrier, F-13248 Marseille CEDEX 04, France), AH(Laboratoire d'Astrophysique Expérimentale, Département de physique, Université de Montréal, C. P. 6128, Succ. centre-ville, Montréal, Qué. H3C 3J7, Canada )
Publication:
The Astronomical Journal, Volume 135, Issue 6, pp. 2038-2047 (2008). (AJ Homepage)
Publication Date:
06/2008
Origin:
IOP
AJ Keywords:
galaxies: individual: NGC 7793, galaxies: ISM, galaxies: kinematics and dynamics, instrumentation: interferometers, techniques: radial velocities
DOI:
10.1088/0004-6256/135/6/2038
Bibliographic Code:
2008AJ....135.2038D

Abstract

Deep Hα observations of the Sculptor Group galaxy NGC 7793 were obtained on the ESO 3.60 m and the Marseille 36 cm telescopes at La Silla, Chile. Hα emission is detected all the way to the edge of the H I disk, making the H II disk of NGC 7793 one of the largest ever observed in a quiet non-active galactic nucleus (AGN) late-type system. Even in the very outer parts, the H II ionizing sources are probably mainly internal (massive stars in the disk) with an unlikely contribution from the extragalactic ionizing background. The Hα kinematics confirms what had already been seen with the H I 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.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints