Radio Selection of the Most Distant Galaxy Clusters

We show that the most distant X-ray-detected cluster known to date, Cl J1001 at , hosts a strong overdensity of radio sources. Six of them are individually detected (within ) in deep resolution VLA 3 GHz imaging, with . Of the six, an active galactic nucleus (AGN) likely affects the radio emission i...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2017-09, Vol.846 (2), p.L31
Main Authors: Daddi, E., Jin, S., Strazzullo, V., Sargent, M. T., Wang, T., Ferrari, C., Schinnerer, E., Smol i, V., Calabró, A., Coogan, R., Delhaize, J., Delvecchio, I., Elbaz, D., Gobat, R., Gu, Q., Liu, D., Novak, M., Valentino, F.
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astronomical models
Astrophysics
Galactic clusters
Galactic evolution
Galaxies
galaxies: clusters: general
galaxies: evolution
galaxies: formation
galaxies: high-redshift
Physics
radio continuum: galaxies
Radio emission
Red shift
Star & galaxy formation
Star formation
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Summary:We show that the most distant X-ray-detected cluster known to date, Cl J1001 at , hosts a strong overdensity of radio sources. Six of them are individually detected (within ) in deep resolution VLA 3 GHz imaging, with . Of the six, an active galactic nucleus (AGN) likely affects the radio emission in two galaxies, while star formation is the dominant source powering the remaining four. We searched for cluster candidates over the full COSMOS 2 deg2 field using radio-detected 3 GHz sources and looking for peaks in density maps. Cl J1001 is the strongest overdensity by far with , with a simple preselection. A cruder photometric rejection of radio foregrounds leaves Cl J1001 as the second strongest overdensity, while even using all radio sources Cl J1001 remains among the four strongest projected overdensities. We conclude that there are great prospects for future deep and wide-area radio surveys to discover large samples of the first generation of forming galaxy clusters. In these remarkable structures, widespread star formation and AGN activity of massive galaxy cluster members, residing within the inner cluster core, will ultimately lead to radio continuum as one of the most effective means for their identification, with detection rates expected in the ballpark of 0.1-1 per square degree at . Samples of hundreds such high-redshift clusters could potentially constrain cosmological parameters and test cluster and galaxy formation models.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/aa8808