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• W2023441430 abstract "We have conducted ultra-deep optical and deep near-infrared observations of a field around the z=1.226 radio-quiet quasar 104420.8+055739 from the Clowes—Campusano LQG of 18 quasars at z∼1.3, in search of associated galaxy clustering. Galaxies at these redshifts are distinguished by their extremely red colours, with I−K>3.75, and we find a factor ∼11 overdensity of such galaxies in a 2.25×2.25 arcmin2 field centred on the quasar. In particular, we find 15–18 galaxies that have colours consistent with being a population of passively evolving massive ellipticals at the quasar redshift. They form ‘fingers’ in the V−KK,I−KK colour—magnitude plots at V−K≃6.9,I−K≃4.3 comparable to the red sequences observed in other z≃1.2 clusters. We find suggestive evidence for substructure among the red sequence galaxies in the K image, in the form of two compact groups, 40 arcsec to the north, and 60 arcsec to the south-east of the quasar. An examination of the wider optical images indicates that this substructure is significant, and that the clustering extends to form a large-scale structure 2–3 h−1 Mpc across. We find evidence for a high (≳50 per cent) fraction of blue galaxies in this system, in the form of 15–20 ‘red outlier’ galaxies with I−K>3.75 and V−I<2.00, which we suggest are dusty, star-forming galaxies at the quasar redshift. Within 30 arcsec of the quasar we find a concentration of blue (V−I<1) galaxies in a band that bisects the two groups of red sequence galaxies. This band of blue galaxies is presumed to correspond to a region of enhanced star formation. We explain this distribution of galaxies as the early stages of a cluster merger which has triggered both the star formation and the quasar." @default.
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• W2023441430 date "2001-05-21" @default.
• W2023441430 modified "2023-09-23" @default.
• W2023441430 title "The galaxy environment of a quasar at z = 1.226: a possible cluster merger" @default.
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• W2023441430 doi "https://doi.org/10.1046/j.1365-8711.2001.04244.x" @default.
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