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Astrophysics > Astrophysics of Galaxies
Title: JWST Observations of Starbursts: Polycyclic Aromatic Hydrocarbon Emission at the Base of the M 82 Galactic Wind
(Submitted on 30 Jan 2024 (v1), last revised 22 Apr 2024 (this version, v4))
Abstract: We present new observations of the central 1 kpc of the M 82 starburst obtained with the James Webb Space Telescope (JWST) near-infrared camera (NIRCam) instrument at a resolution ~0.05"-0.1" (~1-2 pc). The data comprises images in three mostly continuum filters (F140M, F250M, and F360M), and filters that contain [FeII] (F164N), H2 v=1-0 (F212N), and the 3.3 um PAH feature (F335M). We find prominent plumes of PAH emission extending outward from the central starburst region, together with a network of complex filamentary substructure and edge-brightened bubble-like features. The structure of the PAH emission closely resembles that of the ionized gas, as revealed in Paschen alpha 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.
Submission history
From: Alberto D. Bolatto [view email][v1] Tue, 30 Jan 2024 00:42:41 GMT (4134kb,D)
[v2] Wed, 31 Jan 2024 16:11:28 GMT (4134kb,D)
[v3] Thu, 29 Feb 2024 00:05:34 GMT (4126kb,D)
[v4] Mon, 22 Apr 2024 02:50:34 GMT (4126kb,D)
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