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• W3106363005 startingPage "79" @default.
• W3106363005 abstract "Radiation pressure on dust grains may be an important physical mechanism driving galaxy-wide superwinds in rapidly star-forming galaxies. We calculate the combined dust and gas Eddington ratio (Γ) for the archetypal superwind of M82. By combining archival Galaxy Evolution Explorer data, a standard dust model, Monte Carlo dust scattering calculations, and the Herschel map of the dust surface density distribution, the observed far-UV/near-UV surface brightness in the outflow constrains both the total UV luminosity escaping from the starburst along its minor axis (L⋆, UV) and the flux-mean opacity, thus allowing a calculation of Γ. We find that L⋆, UV ≈ (1–6) × 1042 erg s−1, ∼2–12 times greater than the UV luminosity observed from our line of sight. On a scale of 1–3 kpc above the plane of M82, we find that Γ ∼ 0.01–0.06. On smaller scales (∼0.25–0.5 kpc), where the enclosed mass decreases, our calculation of L⋆, UV implies that Γ ∼ 0.1 with factor of few uncertainties. Within the starburst itself, we estimate the single-scattering Eddington ratio to be of order unity. Thus, although radiation pressure is weak compared to gravity on kpc scales above the plane of M82, it may yet be important in launching the observed outflow. We discuss the primary uncertainties in our calculation, the sensitivity of Γ to the dust grain size distribution, and the time evolution of the wind following M82's recent starburst episodes." @default.
• W3106363005 created "2020-11-23" @default.
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• W3106363005 date "2013-11-06" @default.
• W3106363005 modified "2023-09-24" @default.
• W3106363005 title "DUST SCATTERING AND THE RADIATION PRESSURE FORCE IN THE M82 SUPERWIND" @default.
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• W3106363005 doi "https://doi.org/10.1088/0004-637x/778/1/79" @default.
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