Journal Article

Differential microlensing measurements of quasar broad-line kinematics in Q2237+0305

M. O'Dowd, N. F. Bate, R. L. Webster, R. Wayth and K. Labrie

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 3, pages 1985-1998
Published in print August 2011 | ISSN: 0035-8711
Published online August 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.18119.x
Differential microlensing measurements of quasar broad-line kinematics in Q2237+0305

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The detailed workings of the central engines of powerful quasars remain a mystery. This is primarily due to the fact that, at their cosmological distances, the inner regions of these quasars are spatially unresolvable. Reverberation mapping is now beginning to unlock the physics of the broad emission line region (BELR) in nearby, low-luminosity quasars; however it is still unknown whether this gas is dominated by virial motion, by outflows or infall. The challenge is greater for more distant, powerful sources due to the very long response time of the BELR to changes in the continuum. We present a new technique for probing the kinematic properties of the BELR and accretion disc of high-z quasars using differential microlensing, and show how substantial information can be gained through a single observation of a strongly lensed quasar using integral field spectroscopy. We apply this technique to integral field spectroscopy of the multiply imaged quasar Q2237+0305, and find that the observed microlensing signature in the C iii] broad emission line favours gravitationally dominated dynamics over an accelerating outflow.

Keywords: gravitational lensing: strong; gravitational lensing: micro; techniques: imaging spectroscopy; quasars: general; quasars: individual: Q2237+0305

Journal Article.  8632 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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