Discovery of Two Einstein Crosses from Massive Post-blue Nugget Galaxies at z > 1 in KiDS*

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dc.contributor.authorNapolitano, N. R.
dc.contributor.authorLi, R.
dc.contributor.authorSpiniello, C.
dc.contributor.authorTortora, C.
dc.contributor.authorSergeyev, A.
dc.contributor.authorD'Ago, G.
dc.contributor.authorGuo, X.
dc.contributor.authorXie, L.
dc.contributor.authorRadovich, M.
dc.contributor.authorRoy, N.
dc.contributor.authorKoopmans, L. V. E.
dc.contributor.authorKuijken, K.
dc.contributor.authorBilicki, M.
dc.contributor.authorErben, T.
dc.contributor.authorGetman, F.
dc.contributor.authorHeymans, C.
dc.contributor.authorHildebrandt, H.
dc.contributor.authorMoya, C.
dc.contributor.authorShan, H. Y.
dc.contributor.authorVernardos, G.
dc.contributor.authorWright, A. H.
dc.date.accessioned2025-01-23T19:46:58Z
dc.date.available2025-01-23T19:46:58Z
dc.date.issued2020
dc.description.abstractWe 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 the Multi Unit Spectroscopic Explorer at the Very Large Telescope, 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-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 initial mass function); (3) the sources are ultra-compact galaxies, R-e similar to 0.9 kpc (at redshift, z(s) = 1.59) and R-e similar to 0.5 kpc (z(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-near-infrared spectral energy distribution fitting, we argue that the two lensed sources in these ECs are blue nuggets migrating toward their quenching phase.
dc.fuente.origenWOS
dc.identifier.doi10.3847/2041-8213/abc95b
dc.identifier.eissn2041-8213
dc.identifier.issn2041-8205
dc.identifier.urihttps://doi.org/10.3847/2041-8213/abc95b
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/100337
dc.identifier.wosidWOS:000595514500001
dc.issue.numero2
dc.language.isoen
dc.revistaAstrophysical journal letters
dc.rightsacceso restringido
dc.subjectGravitational lensing
dc.subjectStrong gravitational lensing
dc.subjectGalaxy formation
dc.subjectDark matter
dc.titleDiscovery of Two Einstein Crosses from Massive Post-blue Nugget Galaxies at z > 1 in KiDS*
dc.typeartículo
dc.volumen904
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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