The Tremaine-Weinberg method at high redshifts

TL;DR

This study tests the Tremaine-Weinberg method's effectiveness in measuring pattern speeds of high-redshift barred galaxies using simulated JWST data, confirming its reliability for sufficiently long bars.

Contribution

It demonstrates the applicability of the TW method to high-redshift galaxies through mock JWST observations from cosmological simulations, expanding its use beyond nearby galaxies.

Findings

TW method performs adequately for long bars at high redshift

Simulated JWST data can reliably recover pattern speeds

Application to high-redshift galaxies is now feasible

Abstract

This paper examines the reliability of the Tremaine-Weinberg (TW) method in measuring the pattern speed of barred galaxies at high redshifts. Measuring pattern speeds at high redshift may help to shed light on the time evolution of interactions between galactic bars and dark matter halos. The TW method has been extensively employed for nearby galaxies, and its accuracy in determining bar pattern speeds has been validated through numerical simulations. For nearby galaxies, the method yields acceptable results when the inclination angle of the galaxy and the position angle of the bar fall within appropriate ranges. However, the application of the TW method to high-redshift galaxies remains unexplored in both observations and simulations. For this study we generated mock observations of barred galaxies from the TNG50 cosmological simulation. These simulated observations were tailored to mimic the integral field unit (IFU) spectroscopy data that the Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope (JWST) would capture at a redshift of $z\simeq 1.2$. By applying the TW method to these mock observations and comparing the results with the known pattern speeds, we demonstrate that the TW method performs adequately for barred galaxies whose bars are sufficiently long to be detected by JWST at high redshifts. This work opens a new avenue for applying the TW method to investigate the properties of high-redshift barred galaxies.