Neutral atomic and molecular gas dynamics in the nearby spiral galaxies NGC 1512, NGC 4535, and NGC 7496

Abstract

Neutral atomic gas (HI) effectively traces galactic dynamics across mid to large galactocentric radii. However, its limitations in observing small-scale changes within the central few kiloparsecs, coupled with the often observed HI deficit in galactic centers, necessitates using molecular gas emission as a preferred tracer in these regions. Understanding the dynamics of both neutral atomic and molecular gas is crucial for a more complete understanding of how galaxies evolve, funnel gas from the outer disk into their central parts, and eventually form stars. In this work we aim to quantify the dynamics of both, the neutral atomic and molecular gas, in the nearby spiral galaxies NGC 1512, NGC 4535, and NGC 7496 using new MeerKAT-HI observations together with ALMA CO (2-1) observations from the PHANGS collaboration. We use the analysis tool 3D-Barolo to fit tilted ring models to the HI and CO observations. A combined approach of using the HI to constrain the true disk orientation parameters before applying these to the CO datasets is tested. This paper sets expectations for the results of the upcoming high-resolution HI coverage of many galaxies in the PHANGS-ALMA sample using MeerKAT or VLA, to establish a robust methodology for characterizing galaxy orientations and deriving dynamics from combining new HI with existing CO data.

accepted for publication in A&A; 13 pages, 9 Figures (+2 appendix pages)

References in corpus (25)

• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• HyperLEDA. III. The catalogue of extragalactic distances
• SPARC: Mass Models for 175 Disk Galaxies with Spitzer Photometry and Accurate Rotation Curves
• The star formation histories of galaxies in the Sloan Digital Sky Survey
• A z=0 Multi-wavelength Galaxy Synthesis I: A WISE and GALEX Atlas of Local Galaxies
• NGC 3741: dark halo profile from the most extended rotation curve
• Distances to PHANGS Galaxies: New Tip of the Red Giant Branch Measurements and Adopted Distances
• PHANGS CO kinematics: disk orientations and rotation curves at 150 pc resolution
• Dynamical Centers and Non-Circular Motions in THINGS Galaxies: Implications for Dark Matter Halos
• Kinematic modelling of disk galaxies I. A new method to fit tilted rings to data cubes
• Formation of Spiral-Arm Spurs and Bound Clouds in Vertically Stratified Galactic Gas Disks
• Stellar structures, molecular gas, and star formation across the PHANGS sample of nearby galaxies
• Weighing Galaxy Disks with the Baryonic Tully-Fisher Relation
• Action Dynamics of the Local Supercluster
• A cluster in the making: ALMA reveals the initial conditions for high-mass cluster formation
• Radial motions and radial gas flows in local spiral galaxies
• MHONGOOSE -- A MeerKAT Nearby Galaxy HI Survey
• The diversity of rotation curves of simulated galaxies with cusps and cores
• Investigating Disk-Halo Flows and Accretion: A Kinematic and Morphological Analysis of Extraplanar HI in NGC 3044 and NGC 4302
• Planetary Nebula Luminosity Function distances for 19 galaxies observed by PHANGS-MUSE
• PHANGS--JWST First Results: ISM structure on the turbulent Jeans scale in four disk galaxies observed by JWST and ALMA
• PHANGS-MeerKAT and MHONGOOSE HI observations of nearby spiral galaxies: physical drivers of the molecular gas fraction, $R_{\mathrm{mol}}$
• Kinematic analysis of the super-extended HI disk of the nearby spiral galaxy M83
• The ALMaQUEST survey. VIII. What causes the velocity discrepancy between CO and H$\alpha$ rotation curves in galaxies?
• The imprint of arms and bars on rotation curves: in-plane and off-plane

Cited by in corpus (4)

• PHANGS-MeerKAT and MHONGOOSE HI observations of nearby spiral galaxies: physical drivers of the molecular gas fraction, $R_{\mathrm{mol}}$
• New constraints on the evolution of the MHI-M* scaling relation combining CHILES and MIGHTEE-HI data
• The $H_2$ angular momentum -- mass relation of local disc galaxies
• Revisiting the Gas Dynamics of Henize 2-10: Possible Drivers of the Starburst