Explaining two circumnuclear star forming rings in NGC 5248
| Autor: | Sharon E. Meidt, Carole Mundell, T. P. R. van der Laan, L. Hunt, E. Emsellem, S. Haan, Eva Schinnerer, Herve Wozniak, G. Dumas, Torsten Boeker |
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| Přispěvatelé: | Max-Planck-Institut für Astronomie (MPIA), Max-Planck-Gesellschaft, Institut de RadioAstronomie Millimétrique (IRAM), Centre National de la Recherche Scientifique (CNRS), Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
ACTIVE GALACTIC NUCLEI
Cosmology and Nongalactic Astrophysics (astro-ph.CO) [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO] FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Star (graph theory) Ring (chemistry) 01 natural sciences Parsec Gravitational potential LINE KINEMATICS individual: NGC 5248 [galaxies] 0103 physical sciences Emission spectrum Disc 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics ComputingMilieux_MISCELLANEOUS INNER LINDBLAD RESONANCE LENTICULAR GALAXIES DOUBLE-BARRED Physics ISM [galaxies] 010308 nuclear & particles physics Star formation Astronomy and Astrophysics DISK GALAXIES stellar content [galaxies] SAURON PROJECT MOLECULAR GAS Galaxy GALAXIES HOST GALAXIES Physics and Astronomy 13. Climate action Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics SPIRAL GALAXIES Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2013, 556, pp.A98 ASTRONOMY & ASTROPHYSICS |
| ISSN: | 0004-6361 |
| Popis: | The distribution of gas in the central kiloparsec of a galaxy has a dynamically rapid evolution. Nonaxisymmetries in the gravitational potential of the galactic disk, such as a large scale stellar bar or spiral, can lead to significant radial motion of gaseous material from larger radii to the central region. The large influx of gas and the subsequent star formation keep the central region constantly changing. However, the ability of gas to reach the nucleus proper to fuel an AGN phase is not guaranteed. Gas inflow can be halted at a circumnuclear star forming ring several hundred parsec away. The nearby galaxy NGC5248 is especially interesting in this sense since it is said to host 2 circumnuclear star forming rings at 100pc and 370pc from its quiescent nucleus. Here we present new subarcsecond PdBI+30m CO(2-1) emission line observations of the central region. For the first time the molecular gas distribution at the smallest stellar ring is resolved into a gas ring, consistent with the presence of a quiescent nucleus. However, the molecular gas shows no ring structure at the larger ring. We combine analyses of the gaseous and stellar content in the central kiloparsec of this galaxy to understand the gas distribution and dynamics of this star forming central region. We discuss the probability of two scenarios leading to the current observations, given our full understanding of this system, and discuss whether there are really two circumnuclear star forming rings in this galaxy. Accepted for publication in A&A, 14pages + long table |
| Databáze: | OpenAIRE |
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