NOAO >   Observing Info >   Approved Programs >   2016B-0257

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Program Information for 2016B-0257


PI: Joseph Findlay, U. of Wyoming, joseph.findlay@uwyo.edu
Address: Physics Department, 1000E University, Dept 3905, Laramie, WY 82071 United Staetes

CoI: Adam Myers, U. of Wyoming

Title: Testing the quasar disk-wind model at high redshift

Abstract: There is significant evidence to suggest that the broad line region in type-1 quasars is dominated by gravitational kinematics. However the blueshifting of high-ion broad emission lines such as CIV in quasars has been found to be almost ubiquitous. This is widely interpreted as the emission signature of outflowing gas. The most well established attempt to reconcile this inconsistency is via the quasar accretion ``disk- wind'' model, which is modulated by the non-linear correlation between ultraviolet and X-ray continuum luminosity and can be indirectly traced via the relationship between CIV blueshift and rest frame equivalent width. While there has been a concerted effort to establish this model among the low-$z$ quasar population, there has been no similar effort to test the applicability of the model at high-$z$. Quasar accretion modes are known to differ between the low- and high-$z$ populations and therefore one might expect a change in the dominant emission mechanisms and their underlying physical processes, requiring important modifications to the disk-wind model at high-$z$. We have analyzed the CIV properties of a number of $z>6$ quasars within the context of the disk-wind model. We here present tentative evidence that their disk- wind properties differ from their low-$z$ counterparts. We are requesting 16.5-hours of Blanco/ARCoIRIS time in order to observe 11 $zapprox5$ quasars to combine with our $zapprox6$ sample and put our findings on a firm statistical footing.

Program Type: Standard/Extragalactic

Scheduled Nights:
Run 1 (2016B):  CT-4m/ARCoIRIS -- 2n on Jan 13 - Jan 14 2017


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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