Galactic warps: from cosmic noon to the current epoch

Abstract

Approximately half of all disc galaxies exhibit appreciable warps in both their stellar and HI discs. The typical warp amplitude is small (a few degrees), and only becomes noticeable at the periphery of the galaxy disc. As a result, warps remain a relatively poorly studied phenomenon. In this study, we investigate a large sample of distant edge-on galaxies (approximately 1,000 objects) in order to examine the frequency and characteristics of stellar disc warps up to a redshift of $z\sim 2$. For the selected galaxies, we utilize HST data from the Cosmic Evolution Survey field and JWST observations from the Cosmic Dawn Center Archive. We measured the properties of disc warps and investigate their evolution as a function of redshift. Our results indicate a potential evolution in the observed frequency of strong S-shaped warps (with an amplitude greater than 4${}^{\circ }$) in stellar discs as a function of redshift. At $z\approx 2$, the frequency of strong warps reaches approximately 50%, while at $z\approx 0$, this fraction decreases to around 10-15%. We attribute the observed evolution in the occurrence of strong warps to the changing frequency of galaxy interactions and mergers. If galaxy interactions represent one of the primary mechanisms responsible for the formation of warps, then the prevalence of vertical disc deformations should increase in tandem with the rising interaction and merger rate.

Accepted for publication in A&A Letters

References in corpus (17)

• EAZY: A Fast, Public Photometric Redshift Code
• Cool Gas in High Redshift Galaxies
• CEERS Epoch 1 NIRCam Imaging: Reduction Methods and Simulations Enabling Early JWST Science Results
• An Atlas of Color-selected Quiescent Galaxies at $z>3$ in Public $JWST$ Fields
• Observational constraints on the merger history of galaxies since $z\approx 6$: Probabilistic galaxy pair counts in the CANDELS fields
• Neutral Hydrogen and Optical Observations of Edge-on Galaxies: Hunting for Warps
• Galactic Warps Induced By Cosmic Infall
• A catalog of warps in spiral and lenticular galaxies in the Southern hemisphere
• Statistics of galaxy warps in the HDF North and South
• Formation of Warped Disks by Galactic Fly-by Encounters. I. Stellar Disks
• A direct measurement of galaxy major and minor merger rates and stellar mass accretion histories at $z<3$ using galaxy pairs in the REFINE survey
• Properties of tidally-triggered vertical disk perturbations
• Tidally induced warps of spiral galaxies in IllustrisTNG
• Galaxies with conspicuous optical warps
• Near-infrared and optical observations of galactic warps: A common, unexplained feature of most discs
• Warped Disk Galaxies. I. Linking U type Warps in Groups/Clusters to Jellyfish Galaxies
• Less Wound and More Asymmetric: JWST Confirms the Evolution of Spiral Structure in Galaxies at $z\lesssim 3$

Cited by in corpus (2)

• Azimuthal Misalignments in Stellar Warp Structure as Dynamical Tracers of Mergers in Milky Way-like Galaxies
• The morphological stability of open clusters: a new 2D perspective