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Composite Bulges - IV. Detecting Signatures of Gas Inflows in the IFU data: The MUSE View of Ionized Gas Kinematics in NGC 1097

Kolcu, T, Maciejewski, W, Gadotti, DA, Fragkoudi, F, Erwin, P, Sánchez-Blázquez, P, Neumann, J, Ven, GVD, Sá-Freitas, CD, Longmore, S and Debattista, VP (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). pp. 207-223. ISSN 0035-8711

Composite bulges IV Detecting signatures of gas inflows in the IFU data the MUSE view of ionized gas kinematics in NGC 1097.pdf - Published Version

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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 disk can produce artefacts that obscure signatures of the shocks in the residual velocities if the inner part of the disk 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$\alpha$ and [NII]$\lambda$6583. 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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2023 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
SWORD Depositor: A Symplectic
Date Deposited: 03 Jul 2023 08:36
Last Modified: 18 Jul 2023 14:45
DOI or ID number: 10.1093/mnras/stad1896
URI: https://researchonline.ljmu.ac.uk/id/eprint/20187
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