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Spectroscopic follow-up of the quadruply lensed quasar WGD2038-4008/GRAL2038-4008
Lee, Chien-Hsiu
AA(National Optical Astronomy Observatory, 950 N Cherry Ave., Tucson, AZ 85719, USA 0000-0003-1700-5740)
Publications of the Astronomical Society of Australia, Volume 36, id. e011 (PASA Homepage)
Publication Date:
Astronomy Keywords:
catalogues, gravitational lensing: strong, quasars: general, surveys, techniques: image processing
Abstract Copyright:
2019: Astronomical Society of Australia
Bibliographic Code:


We present independent optical spectroscopic follow-up of WGD2038-4008/GRAL2038-4008, a background quasar strongly lensed by a foreground elliptical galaxy into four images, recently discovered independently by Agnello et al. [2018, MNRAS, 479, 4345] and Krone-Martins et al. [2018, A&A, 616, L11] thanks to the exquisite spatial resolution of Gaia. The quasar images are bright (i ˜ 19 mag), thus enabling us to reach S/N > 20 for the continuum within 30 min of exposure time with the Andalucia Faint Object Spectrograph and Camera spectrograph mounted on the 2.56-m Nordic Optical Telescope. The flexible scheduling and high sensitivity delivered by Andalucia Faint Object Spectrograph and Camera provide timely redshifts and reveal the nature of the quasar images; both are essential for lensing modelling and cosmography. Our analysis shows a strong emission feature in a data gap in Agnello et al. [2018, MNRAS, 479, 4345], which can be attributed to as an interloper emission line feature from the foreground lensing galaxy, or hinting to a higher redshift of the background quasar. We discuss these two scenarios and outline possible tests to verify these scenarios.
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