Tutku Kolcu
Composite bulges – IV. Detecting signatures of gas inflows in the IFU data: the MUSE view of ionized gas kinematics in NGC 1097
Kolcu, Tutku; Maciejewski, Witold; Gadotti, Dimitri A; Fragkoudi, Francesca; Erwin, Peter; Sánchez-Blázquez, Patricia; Neumann, Justus; Van de Ven, Glenn; de Sá-Freitas, Camila; Longmore, Steven; Debattista, Victor P
Authors
Witold Maciejewski
Dr Dimitri Gadotti dimitri.a.gadotti@durham.ac.uk
Assistant Professor
Dr Francesca Fragkoudi francesca.fragkoudi@durham.ac.uk
Assistant Professor
Peter Erwin
Patricia Sánchez-Blázquez
Justus Neumann
Glenn Van de Ven
Camila de Sá-Freitas
Steven Longmore
Victor P Debattista
Abstract
Using VLT/MUSE integral-field spectroscopic data for the barred spiral galaxy NGC 1097, we explore techniques that can be used to search for extended coherent shocks that can drive gas inflows in centres of galaxies. Such shocks should appear as coherent velocity jumps in gas kinematic maps, but this appearance can be distorted by inaccurate extraction of the velocity values and dominated by the global rotational flow and local perturbations like stellar outflows. We include multiple components in the emission-line fits, which corrects the extracted velocity values and reveals emission associated with AGN outflows. We show that removal of the global rotational flow by subtracting the circular velocity of a fitted flat disc can produce artefacts that obscure signatures of the shocks in the residual velocities if the inner part of the disc is warped or if gas is moving around the centre on elongated (non-circular) trajectories. As an alternative, we propose a model-independent method which examines differences in the LOSVD moments of H α and [N II]λ6583. This new method successfully reveals the presence of continuous shocks in the regions inward from the nuclear ring of NGC 1097, in agreement with nuclear spiral models.
Citation
Kolcu, T., Maciejewski, W., Gadotti, D. A., Fragkoudi, F., Erwin, P., Sánchez-Blázquez, P., …Debattista, V. P. (2023). Composite bulges – IV. Detecting signatures of gas inflows in the IFU data: the MUSE view of ionized gas kinematics in NGC 1097. Monthly Notices of the Royal Astronomical Society, 524(1), 207-223. https://doi.org/10.1093/mnras/stad1896
Journal Article Type | Article |
---|---|
Acceptance Date | Jun 16, 2023 |
Online Publication Date | Jun 22, 2023 |
Publication Date | Jul 4, 2023 |
Deposit Date | Jan 24, 2024 |
Publicly Available Date | Jan 24, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 524 |
Issue | 1 |
Pages | 207-223 |
DOI | https://doi.org/10.1093/mnras/stad1896 |
Keywords | Space and Planetary Science; Astronomy and Astrophysics |
Public URL | https://durham-repository.worktribe.com/output/2163221 |
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Copyright Statement
Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium,
provided the original work is properly cited.
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