A fully-spectroscopic triple-source-plane lens: the Jackpot completed
| Autor: | Thomas E. Collett, Russell J. Smith |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Einstein ring Cosmic microwave background FOS: Physical sciences Phot Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences symbols.namesake 0103 physical sciences ST/T000244/1 Astrophysics::Solar and Stellar Astrophysics Emission spectrum cosmological parameters dark energy 010303 astronomy & astrophysics STFC Astrophysics::Galaxy Astrophysics Line (formation) Physics 010308 nuclear & particles physics Astronomy and Astrophysics Redshift UKRI Gravitational lens Space and Planetary Science strong [gravitational lensing] Dark energy symbols Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 2021, Vol.505(2), pp.2136-2140 [Peer Reviewed Journal] Smith, R J & Collett, T E 2021, ' A fully-spectroscopic triple-source-plane lens : the Jackpot completed ', Monthly Notices of the Royal Astronomical Society, vol. 505, no. 2 . https://doi.org/10.1093/mnras/stab1399 |
| Popis: | 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 $z_{\rm phot}$ = 2.41$^{+0.04}_{-0.21}$ has previously been available. By visually inspecting an archival 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 [OIII] 5007 Ang at $z_{\rm spec} $ = 2.035. Guided by this proposal, we were able to detect the faint CIII] 1907,1909 Ang emission doublet in a deep VLT MUSE datacube. The CIII] 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 $w$ = $-1.04\pm0.20$. 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. To be resubmitted to MNRAS following very minor comments from referee |
| Databáze: | OpenAIRE |
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