The Astrophysical Journal (Jan 2024)

JWST Observations of Starbursts: Polycyclic Aromatic Hydrocarbon Emission at the Base of the M82 Galactic Wind

  • Alberto D. Bolatto,
  • Rebecca C. Levy,
  • Elizabeth Tarantino,
  • Martha L. Boyer,
  • Deanne B. Fisher,
  • Serena A. Cronin,
  • Adam K. Leroy,
  • Ralf S. Klessen,
  • J. D. Smith,
  • Danielle A. Berg,
  • Torsten Böker,
  • Leindert A. Boogaard,
  • Eve C. Ostriker,
  • Todd A. Thompson,
  • Juergen Ott,
  • Laura Lenkić,
  • Laura A. Lopez,
  • Daniel A. Dale,
  • Sylvain Veilleux,
  • Paul P. van der Werf,
  • Simon C. O. Glover,
  • Karin M. Sandstrom,
  • Evan D. Skillman,
  • John Chisholm,
  • Vicente Villanueva,
  • Thomas S.-Y. Lai,
  • Sebastian Lopez,
  • Elisabeth A. C. Mills,
  • Kimberly L. Emig,
  • Lee Armus,
  • Divakara Mayya,
  • David S. Meier,
  • Ilse De Looze,
  • Rodrigo Herrera-Camus,
  • Fabian Walter,
  • Mónica Relaño,
  • Hannah B. Koziol,
  • Joshua Marvil,
  • María J. Jiménez-Donaire,
  • Paul Martini

DOI
https://doi.org/10.3847/1538-4357/ad33c8
Journal volume & issue
Vol. 967, no. 1
p. 63

Abstract

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We present new observations of the central 1 kpc of the M82 starburst obtained with the James Webb Space Telescope near-infrared camera instrument at a resolution θ ∼ 0.″05–0.″1 (∼1–2 pc). The data comprises images in three mostly continuum filters (F140M, F250M, and F360M), and filters that contain [Fe ii ] (F164N), H _2 v = 1 → 0 (F212N), and the 3.3 μ m polycyclic aromatic hydrocarbon (PAH) feature (F335M). We find prominent plumes of PAH emission extending outward from the central starburst region, together with a network of complex filamentary substructures and edge-brightened bubble-like features. The structure of the PAH emission closely resembles that of the ionized gas, as revealed in Paschen α and free–free radio emission. We discuss the origin of the structure, and suggest the PAHs are embedded in a combination of neutral, molecular, and photoionized gas.

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