Journal article
Microlensing of the broad emission line region in the quadruple lens SDSS J1004 4112
GT Richards, CR Keeton, B Pindor, JF Hennawi, PB Hall, EL Turner, N Inada, M Oguri, SI Ichikawa, RH Becker, MD Gregg, RL White, JSB Wyithe, DP Schneider, DE Johnston, JA Frieman, J Brinkmann
ASTROPHYSICAL JOURNAL | IOP PUBLISHING LTD | Published : 2004
DOI: 10.1086/421868
Abstract
We present seven epochs of spectroscopy on the quadruply imaged quasar SDSS J1004+4112, spanning observed-frame time delays from 1 to 322 days. The spectra reveal differences in the emission lines between the lensed images. Specifically, component A showed a strong enhancement in the blue wings of several high-ionization lines relative to component B, which lasted at least 28 days (observed frame) and then faded. Since the predicted time delay between A and B is ≲30 days, our time coverage suggests that the event was not intrinsic to the quasar. We attribute these variations to microlensing of part of the broad emission line region of the quasar, apparently resolving structure in the source ..
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