Probing the Sizes of Absorbers: Correlations in the z 3.5 Lyman-alpha Forest Between Parallel Lines of Sight

Details Probing the Sizes of Absorbers: Correlations in the z 3.5 Lyman-alpha Forest Between Parallel Lines of Sight Probing the Sizes of Absorbers: Correlations in the z 3.5 Lyman-alpha Forest Between Parallel Lines of Sight

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20311301b&link_type=abstract

American Astronomical Society Meeting 203, #113.01; Bulletin of the American Astronomical Society, Vol. 35, p.1389

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Studies of the intergalactic medium along parallel lines of sight towards quasar pairs offer valuable information on the sizes of intervening absorbers as well as provide the basis for a test of the cosmological constant. We present a study of two high-redshift pairs with moderate separation observed with Keck ESI, Q1422+2309A/Q1424+2255 (z = 3.63, θ = 39'') and Q1439-0034A/B (z = 4.25, θ = 33''). The crosscorrelation of transmitted flux in the Lyα forest shows a strong peak at zero velocity lag in both pairs, suggesting that the Lyα absorbers are coherent over scales > 230-300 proper kpc. Two strong C IV systems at z = 3.4, closely separated along the line of sight, appear in Q1439B but not in Q1439A, consistent with the picture of outflowing material from an intervening galaxy. In contrast, a Mg II system at z = 1.68 does appear in both Q1439A and B. This suggests either a single absorber of size > 280 kpc or two separate, clustered absorbers. We additionally examine the impact of spectral characteristics on applying the Alcock-Paczynski test to quasar pairs, finding a strong dependence on resolution.

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