Effective optical depth from the spectrum of CFHQS J1509-1749
Effective optical depth from the spectrum of CFHQS J1509-1749 (Lyman alpha: red symbols, Lyman beta: blue symbol). The small black symbols show data from SDSS quasars (Fan et al. 2006). The solid line is the extrapolation of optical depth evolution at lower redshift. For J1509-1749 and the SDSS quasars, there is a more rapid evolution at z > 5.4 than indicated in this extrapolation. The dotted and dot-dashed lines are the effective optical depth evolution for two theoretical models.
Credit:International Gemini Observatory/NOIRLab/NSF/AURA
About the Image
Id: | geminiann07015c |
Type: | Chart |
Release date: | Sept. 24, 2007, 6:51 p.m. |
Related announcements: | geminiann07015 |
Size: | 500 x 395 px |
About the Object
Category: | Illustrations |