PHANGS-JWST First Results: multi-wavelength view of feedback-driven bubbles (The Phantom Voids) across NGC 628

Ashley T. Barnes, Elizabeth J. Watkins, Sharon E. Meidt, Kathryn Kreckel, Mattia C. Sormani, Robin G. Tress, Simon C. O. Glover, Frank Bigiel, Rupali Chandar, Eric Emsellem, Janice C. Lee, Adam K. Leroy, Karin M. Sandstrom, Eva Schinnerer, Erik W. Rosolowsky, Francesco Belfiore, Guillermo Blanc, Mederic Boquien, Jakob S. den Brok, Yixian CaoMélanie Chevance, Daniel A. Dale, Oleg Egorov, Cosima Eibensteiner, Kathryn Grasha, Brent Groves, Hamid Hassani, Jonathan Henshaw, Sarah Jeffreson, Maria Jesus Jimenez-Donaire, Benjamin W. Keller, Ralf S. Klessen, Eric W. Koch, J. M. Diederik Kruijssen, Kirsten L. Larson, Jing Li, Daizhong Liu, Laura A. Lopez, Eric J. Murphy, Lukas Neumann, Jerome Pety, Francesca Pinna, Miguel Querejeta, Florent Renaud, Toshiki Saito, Sumit Sarbadhicary, Amy Sardone, Rowan J. Smith, Sophia K. Stuber, Jiayi Sun, David A. Thilker, Antonio Usero, Bradley C. Whitmore, Thomas G. Williams

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We present a high-resolution view of bubbles within the Phantom Galaxy (NGC 628), a nearby (∼10 Mpc), star-forming (∼2 M⊙ yr−1), face-on (i ∼ 9°) grand-design spiral galaxy. With new data obtained as part of the Physics at High Angular resolution in Nearby GalaxieS (PHANGS)-JWST treasury program, we perform a detailed case study of two regions of interest, one of which contains the largest and most prominent bubble in the galaxy (the Phantom Void, over 1 kpc in diameter), and the other being a smaller region that may be the precursor to such a large bubble (the Precursor Phantom Void). When comparing to matched-resolution Hα observations from the Hubble Space Telescope, we see that the ionized gas is brightest in the shells of both bubbles, and is coincident with the youngest (∼1 Myr) and most massive (∼105 M⊙) stellar associations. We also find an older generation (∼20 Myr) of stellar associations is present within the bubble of the Phantom Void. From our kinematic analysis of the H I, H2 (CO), and H ii gas across the Phantom Void, we infer a high expansion speed of around 15 to 50 km s−1. The large size and high expansion speed of the Phantom Void suggest that the driving mechanism is sustained stellar feedback due to multiple mechanisms, where early feedback first cleared a bubble (as we observe now in the Precursor Phantom Void), and since then supernovae have been exploding within the cavity and have accelerated the shell. Finally, comparison to simulations shows a striking resemblance to our JWST observations, and suggests that such large-scale, stellar-feedback-driven bubbles should be common within other galaxies.
Original languageEnglish
Article numberL22
Number of pages13
JournalAstrophysical Journal Letters
Volume944
Issue number2
Early online date16 Feb 2023
DOIs
Publication statusPublished - 20 Feb 2023

Keywords

  • Superbubbles
  • Stellar feedback
  • Interstellar medium
  • Infrared astronomy

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