Stacey, GJ; Swain, MR; Bradford, CM; Barlow, MJ; Cox, P; Fischer, J; Lord, SD; ... Wolfire, MG; + view all Stacey, GJ; Swain, MR; Bradford, CM; Barlow, MJ; Cox, P; Fischer, J; Lord, SD; Luhman, ML; Rieu, NQ; Smith, HA; Unger, SJ; Wolfire, MG; - view fewer (1999) Far-infrared spectroscopic images of M83. In: Cox, P and Kessler, MF, (eds.) The Universe as Seen by ISO: Proceedings of the Conference The Universe as Seen by ISO 1998. (pp. pp. 973-976). European Space Agency: Paris, France.

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Abstract

We have mapped the nearby face on barred spiral galaxy, M83 in the bright [CII] 158 μm, [OI] 63 and 146 μm, [NII] 122 μm, and [OIII] 88 μm fine-structure lines with the Long Wavelength Spectrometer (LWS) on ISO. The maps are nearly fully sampled, and cover the inner 6.75' x 6' region - essentially the entire optical disk. We also obtained a full LWS grating scan of the nucleus. The lines are detectable over the entire disk, and enhanced at the nucleus, where the [OI] 63 μm and [NII] lines are particularly strong. At the nucleus, the line ratios indicate a strong starburst headed by O9 stars. Surprisingly, the [OI] and [CII] line emission (from photodissociation regions) is not enhanced relative to [NII] (from low density HII regions) on the spiral arms. The line ratios are the same for the spiral arms and interarm regions. We find very strong emission in the [OIII] 88 μm, [OI] 146 μm, and [CII] lines at the intersection of the bar and spiral arm to the SW indicating particularly strong star formation activity there. The [OI] 63 μm/146 μm line ratio is quite small there likely the result of self absorption in the 63 μm line by enveloping clouds. The total luminosity of this emission peak is 1.2 x 109 Lodot

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