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Napolitano, N R; R Li; Spiniello, C; Tortora, C; Sergeyev, A; D'Ago, G; Guo, X; Xie, L; Radovich, M; Roy, N; Koopmans, L V E; Kuijken, K; Bilicki, M; Erben, T; Getman, F; Heymans, C; Hildebrandt, H; Moya, C; Shan, H Y; Vernardos, G; Wright, A H
arXiv.org, 11/2020Paper, Journal Article
We report the discovery of two Einstein Crosses (ECs) in the footprint of the Kilo-Degree Survey (KiDS): KIDS J232940-340922 and KIDS J122456+005048. Using integral field spectroscopy from MUSE@VLT, we confirm their gravitational-lens nature. In both cases, the four spectra of the source clearly show a prominence of absorption features, hence revealing an evolved stellar population with little star formation. The lensing model of the two systems, assuming a singular isothermal ellipsoid (SIE) with external shear, shows that: 1) the two crosses, located at redshift \(z=0.38\) and 0.24, have Einstein radius \(R_{\rm E}=5.2\) kpc and 5.4 kpc, respectively; 2) their projected dark matter fractions inside the half effective radius are 0.60 and 0.56 (Chabrier IMF); 3) the sources are ultra-compact galaxies, \(R_{\rm e}\sim0.9\) kpc (at redshift \(z_{\rm s}=1.59\)) and \(R_{\rm e}\sim0.5\) kpc (\(z_{\rm s}=1.10\)), respectively. These results are unaffected by the underlying mass density assumption. Due to size, blue color and absorption-dominated spectra, corroborated by low specific star-formation rates derived from optical-NIR spectral energy distribution fitting, we argue that the two lensed sources in these ECs are blue nuggets migrating toward their quenching phase.
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