Article Dans Une Revue Astronomy & Astrophysics - A&A Année : 2024

Dynamical resonances in PHANGS galaxies

Marina Ruiz-García
  • Fonction : Auteur
Miguel Querejeta
  • Fonction : Auteur
Santiago García-Burillo
  • Fonction : Auteur
Sharon E. Meidt
  • Fonction : Auteur
Mattia C. Sormani
  • Fonction : Auteur
Eva Schinnerer
  • Fonction : Auteur
Thomas G. Williams
  • Fonction : Auteur
Zein Bazzi
  • Fonction : Auteur
Dario Colombo
  • Fonction : Auteur
Damian R. Gleis
  • Fonction : Auteur
Oleg Y. Gnedin
  • Fonction : Auteur
Ralf S. Klessen
  • Fonction : Auteur
Adam K. Leroy
  • Fonction : Auteur
Patricia Sánchez-Blázquez
  • Fonction : Auteur
Sophia K. Stuber
  • Fonction : Auteur

Résumé

Bars are remarkable stellar structures that can transport gas toward centers and drive the secular evolution of galaxies. In this context, it is important to locate dynamical resonances associated with bars. For this study, we used Spitzer near-infrared images as a proxy for the stellar gravitational potential and the ALMA CO(J = 2–1) gas distribution from the PHANGS survey to determine the position of the main dynamical resonances associated with the bars in the PHANGS sample of 74 nearby star-forming galaxies. We used the gravitational torque method to estimate the location of the bar corotation radius (RCR), where stars and gas rotate at the same angular velocity as the bar. Of the 46 barred galaxies in PHANGS, we have successfully determined the corotation (CR) for 38 of them. The mean ratio of the RCR to the bar radius (Rbar) is ℛ = RCR/Rbar = 1.12, with a standard deviation of 0.39. This is consistent with the average value expected from theory and suggests that bars are predominantly fast. We also compared our results with other bar CR measurements from the literature, which employ different methods, and find good agreement (ρ = 0.64). Finally, using rotation curves, we have estimated other relevant resonances such as the inner Lindblad resonance (ILR) and the outer Lindblad resonance (OLR), which are often associated with rings. This work provides a useful catalog of resonances for a large sample of nearby galaxies and emphasizes the clear connection between bar dynamics and morphology.

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Dates et versions

insu-04838841 , version 1 (15-12-2024)

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Marina Ruiz-García, Miguel Querejeta, Santiago García-Burillo, Eric Emsellem, Sharon E. Meidt, et al.. Dynamical resonances in PHANGS galaxies. Astronomy & Astrophysics - A&A, 2024, 691, ⟨10.1051/0004-6361/202450935⟩. ⟨insu-04838841⟩
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