Evolution of Structure in Late-type Spiral Galaxies I: Ionized Gas Kinematics in NGC 628

Abstract

We study two dimensional Fabry-Perot interferometric observations of the nearby face-on late-type spiral galaxy, NGC 628, in order to analyse the ionized gas component of the interstellar medium. Covering the galaxy out to a radius larger than 12 kpc, and with a spatial sampling of 1.6 arcsec, we investigate the large-scale dynamics as well as feedback from individual HII regions into their surrounding medium. We study the role of gravitational perturbations along with that of external triggers which can disturb the kinematics and morphology of NGC 628. We verify the presence of an inner rapidly rotating disc-like component in NGC 628, which we interpret as caused by slow secular evolution of the large-scale spiral arms and oval structure. In combination with auxiliary data, we find indication for that gas is falling in from the outer parts towards the central regions, where a nuclear ring has formed at the location of the inner Lindblad resonance radius of an m=2 perturbation which could help build a pseudo-bulge in NGC 628. Moreover, we calculate radial profiles of the emission-line velocity dispersion which we use to study the role of feedback from individual HII regions. The mean velocity dispersion for the ionized gas (even when excluding pixels belonging to individual HII regions) is almost constant out to 12 kpc, although it varies from 14 to 20 km/s, with a steady decline in the outer parts. The current paper demonstrates a number of tools that we have developed for building a solid frame work for studying the evolution of structure in spiral galaxies using two dimensional kinematic observations.

Accepted for publications in A&A. 13 pages, 7 figures, and including a calatogue of 376 HII regions with calibrated luminosities. Please find high-resolution version on http://www.astro.su.se/~kambiz/DOC/paper-N628.ps.gz

References in corpus (7)

• The SAURON project - VII. Integral-field absorption and emission-line kinematics of 24 spiral galaxy bulges
• Galactic Warps Induced By Cosmic Infall
• Streaming Motions Towards the Supermassive Black Hole in NGC 1097
• The Star Formation History and Evolution of the Circumnuclear Region of M100
• Gemini/GMOS IFU stellar kinematics of the nuclear region of six nearby active galaxies
• Improved 3D Fabry-Perot Data Reduction Techniques
• Lifetime of nuclear velocity dispersion drops in barred galaxies

Cited by in corpus (15)

• Fueling AGN II: Spatially Resolved Molecular Inflows and Outflows
• H-alpha Kinematics of the SINGS Nearby Galaxies Survey. II
• Quantifying Resonant Structure in NGC 6946 from Two-dimensional Kinematics
• Bar imprints on the inner gas kinematics of M33
• The headlight cloud in NGC 628: An extreme giant molecular cloud in a typical galaxy disk
• Spiral inflow feeding the nuclear starburst in M83, observed in H-alpha emission with the GHAFAS Fabry-Perot interferometer
• Spin Parity of Spiral Galaxies I -- Corroborative Evidence for Trailing Spirals
• Kinematic Evidence for Halo Substructure in Spiral Galaxies
• The inner mass distribution of late-type spiral galaxies from SAURON stellar kinematic maps
• PHANGS-JWST First Results: A combined HST and JWST analysis of the nuclear star cluster in NGC 628
• First detection of a minor merger a z~0.6
• Study of star formation in NGC 1084
• Molecular Line Ratio Diagnostics Along the Radial Cut and Dusty UV-bright Clumps in a Spiral Galaxy NGC 0628
• Star formation rates and the kinematics of gas in the spiral arms of NGC 628
• Spatially-resolved TRGB JWST color-magnitude as a tool to measure fossil stellar metallicity gradients in disk galaxies: NGC 628