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Fig. 3


Left: full submillimeter spectrum of the center of NGC 5128 (Centaurus A) obtained with the SPIRE instrument on board the Herschel Space Observatory (See Sect. 2). Species and transitions are identified throughout. The jump in the continuum at 944 GHz is caused by the different angular resolutions of the SLW and the SSW (see Sect. 2). The SPIRE continuum contains a contribution from the point source nucleus of about 8.2 Jy at 460 GHz, slowly decreasing with frequency. The remaining continuum is due to extended thermal emission from dust, increasing with frequency. Vertical scale is flux in Jansky, horizontal scale is frequency in GHz. For more details, see Tables 2 and 3. Right: comparison of SPIRE CO line fluxes of the NGC 5128 center with those of the starburst galaxy M 82, the AGN+starburst NGC 1068, and the (U)LIRGs Arp 193, Arp 220, and NGC 6240. Mrk 231 has not been marked separately as its spectral ladder is identical to that of NGC 6240. The ratio of the galaxy CO line flux to the Cen A CO line flux is shown for each J transition, as observed by SPIRE without correction for finite beam-size, source extent, and beam efficiency. The vertical line separates measurements obtained with the SSW from those obtained with the SLW in a beam roughly twice as wide.

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