RESEARCH

 

Click on the images for higher-resolution versions

Figure 1 -- Top: Quasar composite image. It shows observed quasar spectra as a function of redshift. Every row is a composite spectrum of 50 quasars at the same redshift.

Bottom: An animation showing observed quasar spectra as a function of redshift.

Figure 2 -- Top: Residual composite image of quasars. This shows the residuals, i.e., the observed spectra (Figure 1) normalized with the best-fit continua, as a function of redshift.

Bottom: The upper panel shows an example observed quasar spectrum (black) and the best-fit continuum (red). The lower panel shows the residual after normalization with the best-fit continuum.

Figure 3 -- Top: Residual composite image of quasars, with Mg II absorbers (black dots) detected in individual spectra.

Bottom: The same as Figure 2, but we label the lines associated with the absorber we detected. The green region in the top panel shows the search window between the quasar's C IV and Mg II. Absorbers found in the hatched region are likely quasar-associated.

Figure 4 -- Top: Residual composite image of absorbers. It shows the residual spectra as a function of absorber redshift. Every row is 25 absorbers at the same redshift.

Bottom: A full composite spectrum of all absorbers with W0λ2796 > 0.8 Å (I will add the labels soon!).

☆ This work has been funded by the NSF grant AST-1109665.