The Circumnuclear Environment of IRAS 20551-4250: A Case Study of AGN/Starburst Connection for JWST

Figure 4

VLT/ISAAC L- and M-bands, plus Spitzer/IRS low-resolution spectra of IRAS 20551-4250. The data and best-fit models for each band are plotted in green and black, respectively. The different contributions to the observed spectra (blue for AGN component, red for the SB one) are also shown. Absorption features are fitted separately and then combined with the AGN template. Due to the strong reddening of the AGN continuum, the only AGN signature within the L-band is the shallow, structured 3.4 μm hydrocarbon absorption, highly diluted by the SB emission. The M-band continuum cannot be constrained due to the deep CO features, while the 6.0 μm water ice and 6.85 μm hydrocarbon absorption profiles are detected at 5–8 μm [9, 15].