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Fuelling the nuclear ring of NGC 1097

Galactic bars can drive cold gas inflows towards the centres of galaxies. The gas transport happens primarily through the so-called bar dust lanes, which connect the galactic disc at kpc scales to the nuclear rings at hundreds of pc scales much like two gigantic galactic rivers. Once in the ring, th...

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Main Authors: Sormani, Mattia C. (Author) , Barnes, Ashley T (Author) , Sun, Jiayi (Author) , Stuber, Sophia K (Author) , Schinnerer, Eva (Author) , Emsellem, Eric (Author) , Leroy, Adam K (Author) , Glover, Simon (Author) , Henshaw, Jonathan D (Author) , Meidt, Sharon E (Author) , Neumann, Justus (Author) , Querejeta, Miguel (Author) , Williams, Thomas G (Author) , Bigiel, Frank (Author) , Eibensteiner, Cosima (Author) , Fragkoudi, Francesca (Author) , Levy, Rebecca C (Author) , Grasha, Kathryn (Author) , Klessen, Ralf S. (Author) , Kruijssen, J M Diederik (Author) , Neumayer, Nadine (Author) , Pinna, Francesca (Author) , Rosolowsky, Erik W (Author) , Smith, Rowan J (Author) , Teng, Yu-Hsuan (Author) , Tress, Robin G (Author) , Watkins, Elizabeth J. (Author)
Format: Article (Journal)
Language:English
Published: August 2023
In: Monthly notices of the Royal Astronomical Society
Year: 2023, Volume: 523, Issue: 2, Pages: 2918-2927
ISSN:1365-2966
DOI:10.1093/mnras/stad1554
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1093/mnras/stad1554
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Author Notes:Mattia C. Sormani, Ashley T. Barnes, Jiayi Sun, Sophia K. Stuber, Eva Schinnerer, Eric Emsellem, Adam K. Leroy, Simon C.O. Glover, Jonathan D. Henshaw, Sharon E. Meidt, Justus Neumann, Miguel Querejeta, Thomas G. Williams, Frank Bigiel, Cosima Eibensteiner, Francesca Fragkoudi, Rebecca C. Levy, Kathryn Grasha, Ralf S. Klessen, J.M. Diederik Kruijssen, Nadine Neumayer, Francesca Pinna, Erik W. Rosolowsky, Rowan J. Smith, Yu-Hsuan Teng, Robin G. Tress and Elizabeth J. Watkins
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Summary:Galactic bars can drive cold gas inflows towards the centres of galaxies. The gas transport happens primarily through the so-called bar dust lanes, which connect the galactic disc at kpc scales to the nuclear rings at hundreds of pc scales much like two gigantic galactic rivers. Once in the ring, the gas can fuel star formation activity, galactic outflows, and central supermassive black holes. Measuring the mass inflow rates is therefore important to understanding the mass/energy budget and evolution of galactic nuclei. In this work, we use CO datacubes from the PHANGS-ALMA survey and a simple geometrical method to measure the bar-driven mass inflow rate on to the nuclear ring of the barred galaxy NGC 1097. The method assumes that the gas velocity in the bar lanes is parallel to the lanes in the frame co-rotating with the bar, and allows one to derive the inflow rates from sufficiently sensitive and resolved position–position–velocity diagrams if the bar pattern speed and galaxy orientations are known. We find an inflow rate of M˙=(3.0±2.1)M⊙yr−1 averaged over a time span of 40 Myr, which varies by a factor of a few over time-scales of ∼10 Myr. Most of the inflow appears to be consumed by star formation in the ring, which is currently occurring at a star formation rate (SFR) of ≃1.8−2M⊙yr−1⁠, suggesting that the inflow is causally controlling the SFR in the ring as a function of time.
Item Description:Veröffentlicht: 23. Mai 2023
Gesehen am 12.10.2023
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stad1554

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