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| Verfasst von: | Eibensteiner, Cosima [VerfasserIn]  |
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| | Barnes, Ashley T. [VerfasserIn] |
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| | Bigiel, Frank [VerfasserIn] |
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| | Schinnerer, Eva [VerfasserIn] |
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| | Liu, D. [VerfasserIn] |
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| | Meier, D. S. [VerfasserIn] |
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| | Usero, A. [VerfasserIn] |
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| | Leroy, A. K. [VerfasserIn] |
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| | Rosolowsky, E. [VerfasserIn] |
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| | Puschnig, J. [VerfasserIn] |
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| | Lazar, I. [VerfasserIn] |
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| | Pety, J. [VerfasserIn] |
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| | Lopez, L. A. [VerfasserIn] |
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| | Emsellem, E. [VerfasserIn] |
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| | Bešlić, I. [VerfasserIn] |
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| | Querejeta, M. [VerfasserIn] |
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| | Murphy, E. J. [VerfasserIn] |
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| | Brok, J. den [VerfasserIn] |
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| | Schruba, Andreas [VerfasserIn] |
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| | Chevance, Mélanie [VerfasserIn] |
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| | Glover, Simon [VerfasserIn] |
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| | Gao, Y. [VerfasserIn] |
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| | Grasha, K. [VerfasserIn] |
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| | Hassani, H. [VerfasserIn] |
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| | Henshaw, Jonathan D. [VerfasserIn] |
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| | Jimenez-Donaire, M. J. [VerfasserIn] |
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| | Klessen, Ralf S. [VerfasserIn] |
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| | Kruijssen, Diederik [VerfasserIn] |
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| | Pan, H.-A. [VerfasserIn] |
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| | Saito, T. [VerfasserIn] |
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| | Sormani, Mattia C. [VerfasserIn] |
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| | Teng, Y.-H. [VerfasserIn] |
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| | Williams, Thomas G. [VerfasserIn] |
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| Titel: | A 2-3 mm high-resolution molecular line survey towards the centre of the nearby spiral galaxy NGC 6946 |
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| Verf.angabe: | C. Eibensteiner, A.T. Barnes, F. Bigiel, E. Schinnerer, D. Liu, D. S. Meier, A. Usero, A.K. Leroy, E. Rosolowsky, J. Puschnig, I. Lazar, J. Pety, L.A. Lopez, E. Emsellem, I. Bešlić, M. Querejeta, E.J. Murphy, J. den Brok, A. Schruba, M. Chevance, S.C.O. Glover, Y. Gao, K. Grasha, H. Hassani, J.D. Henshaw, M.J. Jimenez-Donaire, R.S. Klessen, J.M.D. Kruijssen, H.-A. Pan, T. Saito, M.C. Sormani, Y.-H. Teng, and T.G. Williams |
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| E-Jahr: | 2022 |
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| Jahr: | 23 March 2022 |
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| Umfang: | 37 S. |
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| Fussnoten: | Gesehen am 21.04.2022 |
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| Titel Quelle: | Enthalten in: Astronomy and astrophysics |
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| Ort Quelle: | Les Ulis : EDP Sciences, 1969 |
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| Jahr Quelle: | 2022 |
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| Band/Heft Quelle: | 659(2022), Artikel-ID A173, Seite 1-37 |
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| ISSN Quelle: | 1432-0746 |
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| Abstract: | The complex physical, kinematic, and chemical properties of galaxy centres make them interesting environments to examine with molecular line emission. We present new 2 − 4″ (∼75 − 150 pc at 7.7 Mpc) observations at 2 and 3 mm covering the central 50″ (∼1.9 kpc) of the nearby double-barred spiral galaxy NGC 6946 obtained with the IRAM Plateau de Bure Interferometer. We detect spectral lines from ten molecules: CO, HCN, HCO<sup>+<sup/>, HNC, CS, HC<sub>3<sub/>N, N<sub>2<sub/>H<sup>+<sup/>, C<sub>2<sub/>H, CH<sub>3<sub/>OH, and H<sub>2<sub/>CO. We complemented these with published 1 mm CO observations and 33 GHz continuum observations to explore the star formation rate surface density Σ<sub>SFR<sub/> on 150 pc scales. In this paper, we analyse regions associated with the inner bar of NGC 6946 - the nuclear region (NUC), the northern (NBE), and southern inner bar end (SBE) and we focus on short-spacing corrected bulk (CO) and dense gas tracers (HCN, HCO<sup>+<sup/>, and HNC). We find that HCO<sup>+<sup/> correlates best with Σ<sub>SFR<sub/>, but the dense gas fraction (<i>f<i/><sub>dense<sub/>) and star formation efficiency of the dense gas (SFE<sub>dense<sub/>) fits show different behaviours than expected from large-scale disc observations. The SBE has a higher Σ<sub>SFR<sub/>, <i>f<i/><sub>dense<sub/>, and shocked gas fraction than the NBE. We examine line ratio diagnostics and find a higher CO(2−1)/CO(1−0) ratio towards NBE than for the NUC. Moreover, comparison with existing extragalactic datasets suggests that using the HCN/HNC ratio to probe kinetic temperatures is not suitable on kiloparsec and sub-kiloparsec scales in extragalactic regions. Lastly, our study shows that the HCO<sup>+<sup/>/HCN ratio might not be a unique indicator to diagnose AGN activity in galaxies. |
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| DOI: | doi:10.1051/0004-6361/202142624 |
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| URL: | Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.
Volltext ; Verlag: https://doi.org/10.1051/0004-6361/202142624 |
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| | Volltext: https://www.aanda.org/articles/aa/abs/2022/03/aa42624-21/aa42624-21.html |
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| | DOI: https://doi.org/10.1051/0004-6361/202142624 |
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| Datenträger: | Online-Ressource |
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| Sprache: | eng |
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| K10plus-PPN: | 1799504689 |
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| Verknüpfungen: | → Zeitschrift |
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¬A¬ 2-3 mm high-resolution molecular line survey towards the centre of the nearby spiral galaxy NGC 6946 / Eibensteiner, Cosima [VerfasserIn]; 23 March 2022 (Online-Ressource)
