Skip to main content

Research Repository

Advanced Search

A fully-spectroscopic triple-source-plane lens: the Jackpot completed

Smith, Russell J; Collett, Thomas E

A fully-spectroscopic triple-source-plane lens: the Jackpot completed Thumbnail


Authors

Thomas E Collett



Abstract

We present a spectroscopic determination of the redshift of the second source in the Jackpot gravitational lens system J0946 + 1006, for which only a photometric estimate of zphot  =  2.41+0.04−0.21 has previously been available. By visually inspecting an archival Very Large Telescope (VLT) X-Shooter observation, we located a single emission line from the source in the H-band. Among the possible options, we find that this line is most likely to be [O III] 5007 Å at zspec  =  2.035. Guided by this proposal, we were able to detect the faint C III] 1907,1909 Å emission doublet in a deep VLT Multi Unit Spectroscopic Explorer datacube. The C III] emission is spatially coincident with the brightest parts of the second Einstein ring, and strongly supports the redshift identification. The spectroscopic redshift is only marginally consistent with the photometric estimate. Re-examining the cosmological constraints from J0946 + 1006, the revised measurement favours less negative values of the dark energy equation-of-state parameter w; when combined with a cosmic microwave background prior, we infer w  =  −1.04 ± 0.20. The revised redshift does not significantly help to reconcile the small discrepancy in the image positions for the even more distant third source in J0946 + 1006.

Citation

Smith, R. J., & Collett, T. E. (2021). A fully-spectroscopic triple-source-plane lens: the Jackpot completed. Monthly Notices of the Royal Astronomical Society, 505(2), 2136-2140. https://doi.org/10.1093/mnras/stab1399

Journal Article Type Article
Acceptance Date May 12, 2021
Online Publication Date May 17, 2021
Publication Date 2021-08
Deposit Date Jul 6, 2021
Publicly Available Date Jul 6, 2021
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 505
Issue 2
Pages 2136-2140
DOI https://doi.org/10.1093/mnras/stab1399

Files

Published Journal Article (2.2 Mb)
PDF

Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.






You might also like



Downloadable Citations