Fig. 8 from The Chandra Deep Field–South: Optical Spectroscopy. I.

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The Chandra Deep Field–South: Optical Spectroscopy. I.

Authors: G. P. Szokoly, J. Bergeron, G. Hasinger, I. Lehmann, L. Kewley, V. Mainieri, M. Nonino, P. Rosati, R. Giacconi, R. Gilli, R. Gilmozzi, C. Norman, M. Romaniello, E. Schreier, P. Tozzi, J. X. Wang, W. Zheng, and A. Zirm

Szokoly et al. 2004 The Astrophysical Journal Supplement Series 155 271.

Provider: AAS Journals

Caption: Fig. 8.

Hardness ratio vs. redshift, assuming a typical absorbed AGN spectrum with ﹩\Gamma =2﹩ and different absorptions, expressed as ﹩\mathrm{log}\,( N_{\mathrm{H}\,}) ﹩. Identified CDFS objects are also plotted (see Fig. 2 for symbols). HEX objects (likely optical type 2 AGNs) are additionally marked with a hexagon.

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