Characterizing the Environment, Emission Geometry, and Radiative History of Quasars using Projected Quasar Pairs

Details Characterizing the Environment, Emission Geometry, and Radiative History of Quasars using Projected Quasar Pairs Characterizing the Environment, Emission Geometry, and Radiative History of Quasars using Projected Quasar Pairs

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..545h&link_type=abstract

NOAO Proposal ID #2006A-0545

Physics

Scientific paper

We have obtained high S/N moderate and high resolution Gemini and Keck spectra of the Ly(alpha) forests of a large sample of projected pairs of quasars with z> 2 and sub-arcminute separations. In these extremely rare sightlines, Ly(alpha) absorption, as measured in the background quasar spectrum, can be used to study the environment, emission geometry, and radiative history of the foreground quasar, provided that the systemic redshift of the foreground quasar is known accurately. We propose to obtain low dispersion (R 1700) H- band spectra of 24 sub-arcminute z > 2 projected pairs of quasars, with NIRI and GNIRS to determine systemic redshifts from the narrow [OIII] (lambda) 5008 emission line accurate to < 100km s^-1. This will eliminate the current 5 hmpc uncertainty in the foreground quasars' radial position, resolving transverse length scales as small as 25hkpc. We will then be able to characterize the transverse proximity effect, measure the cross-correlation function of quasars with neutral gas, constrain the isotropy of quasar emission, and the emission history of the quasars on timescales from 8 × 10^4 to 3 × 10^6 years, as well as gain insights into the fluorescent recombination radiation emitted by Lyman limit systems illuminated by ultraviolet photons.

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