Free Access

Fig. 4


Colour-colour distributions of the SDSS/BOSS-DR12 quasar sample in the redshift range, 2.5 <z< 3.5 (black contours). The reddening has moved eHAQ0111+0641 (shown with a large red circle) away from the quasar locus onto the stellar track indicated with yellow (normal stars) and red (M-dwarfs and later) stars. The small red circle shows the position of HAQ2225+0527 discussed in Krogager et al. (2016a), which also falls on the stellar track in the SDSS colours. In the near-IR the object is well separated from the stellar track. The dark red points show the distribution of 150 HAQs from Krogager et al. (2015). Also plotted are the reddening vectors for a z = 3 quasar reddened by SMC, LMC, and MW extinction curves from Pei (1992) at foreground redshifts of 2.0 (blue lines) and 2.5 (red lines). The diamonds along the lines show the points corresponding to AVs of 0.5, 1.0, 1.5, and 2.0.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.