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Explaining two circumnuclear star forming rings in NGC 5248

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Abstract
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 NGC 5248 is especially interesting in this sense since it is said to host 2 circumnuclear star forming rings at 100 pc and 370 pc 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.
Keywords
ACTIVE GALACTIC NUCLEI, INNER LINDBLAD RESONANCE, DOUBLE-BARRED, GALAXIES, MOLECULAR GAS, SPIRAL GALAXIES, SAURON PROJECT, DISK GALAXIES, HOST GALAXIES, LENTICULAR GALAXIES, LINE KINEMATICS, galaxies: ISM, galaxies: stellar content, galaxies: individual: NGC 5248

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MLA
van der Laan, TPR, et al. “Explaining Two Circumnuclear Star Forming Rings in NGC 5248.” ASTRONOMY & ASTROPHYSICS, vol. 556, 2013.
APA
van der Laan, T., Schinnerer, E., Emsellem, E., van der Wel, S. M., Dumas, G., Boker, T., … Wozniak, H. (2013). Explaining two circumnuclear star forming rings in NGC 5248. ASTRONOMY & ASTROPHYSICS, 556.
Chicago author-date
Laan, TPR van der, E Schinnerer, E Emsellem, Sharon Meidt van der Wel, G Dumas, T Boker, L Hunt, S Haan, C Mundell, and H Wozniak. 2013. “Explaining Two Circumnuclear Star Forming Rings in NGC 5248.” ASTRONOMY & ASTROPHYSICS 556.
Chicago author-date (all authors)
van der Laan, TPR, E Schinnerer, E Emsellem, Sharon Meidt van der Wel, G Dumas, T Boker, L Hunt, S Haan, C Mundell, and H Wozniak. 2013. “Explaining Two Circumnuclear Star Forming Rings in NGC 5248.” ASTRONOMY & ASTROPHYSICS 556.
Vancouver
1.
van der Laan T, Schinnerer E, Emsellem E, van der Wel SM, Dumas G, Boker T, et al. Explaining two circumnuclear star forming rings in NGC 5248. ASTRONOMY & ASTROPHYSICS. 2013;556.
IEEE
[1]
T. van der Laan et al., “Explaining two circumnuclear star forming rings in NGC 5248,” ASTRONOMY & ASTROPHYSICS, vol. 556, 2013.
@article{8622824,
  abstract     = {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 NGC 5248 is especially interesting in this sense since it is said to host 2 circumnuclear star forming rings at 100 pc and 370 pc 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.},
  articleno    = {A98},
  author       = {van der Laan, TPR and Schinnerer, E and Emsellem, E and van der Wel, Sharon Meidt and Dumas, G and Boker, T and Hunt, L and Haan, S and Mundell, C and Wozniak, H},
  issn         = {0004-6361},
  journal      = {ASTRONOMY & ASTROPHYSICS},
  keywords     = {ACTIVE GALACTIC NUCLEI,INNER LINDBLAD RESONANCE,DOUBLE-BARRED,GALAXIES,MOLECULAR GAS,SPIRAL GALAXIES,SAURON PROJECT,DISK GALAXIES,HOST GALAXIES,LENTICULAR GALAXIES,LINE KINEMATICS,galaxies: ISM,galaxies: stellar content,galaxies: individual: NGC 5248},
  language     = {eng},
  pages        = {14},
  title        = {Explaining two circumnuclear star forming rings in NGC 5248},
  url          = {http://dx.doi.org/10.1051/0004-6361/201321572},
  volume       = {556},
  year         = {2013},
}

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