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Euclid: A blue galaxy population and a brightest cluster galaxy in the making in a z∼ 1.74 MaDCoWS2 galaxy cluster candidate

A. Trudeau A. H. Gonzalez S. Stanford S. Shamyati S. Taamoli +495 lainnya
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We present an example cluster follow-up study with . Our target, a z∼ 1.74 candidate cluster nicknamed the `Puddle', was initially discovered by the Massive and Distant Clusters of WISE Survey 2 as a z_ ∼ 1.65 candidate cluster. It was also detected independently as a z_ ∼ 1.5 candidate with the two cluster-finding algorithms in Euclid Quick Release 1 (Q1). A Keck MOSFIRE spectrum shows the brightest nucleus is at z=1.74 and is dominated by an active galactic nucleus. Our analysis focused on the galaxy population and the brightest cluster galaxy (BCG), and is based on and ancillary photometry. Compared to similar fields, we measured an overdensity of 110± 14 galaxies with ̋Ełeq 22.25 in a imaging revealed that six or seven galaxies appear to be assembling to form the future BCG. Spectral energy distribution fitting suggests that the merging BCG has a stellar mass of 5.7± 0.3 ,M_⊙ and that it experienced a short burst of star formation ∼ 300,Myr ago. Its morphology and star-formation history suggest that the proto-BCG is a more evolved version of the merging core of SPT2349-56. These systems indicate that multiobject mergers might be a common BCG formation process. Assuming a similar density of mergers in the Euclid Wide Survey, we expect that will discover approximately 400 assembling BCGs by the end of its mission. Euclid phot phot Euclid radius around the BCG. About 18± 4% of the completeness-corrected galaxy population is red, which is consistent with some clusters at z>1.5 but lower than others. Euclid 10^ 11 Euclid

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A. H. Gonzalez

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S. Stanford

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Format Sitasi

APA MLA BibTeX
Trudeau, A., Gonzalez, A.H., Stanford, S., Shamyati, S., Taamoli, S., Stern, D. et al. (2026). Euclid: A blue galaxy population and a brightest cluster galaxy in the making in a z∼ 1.74 MaDCoWS2 galaxy cluster candidate. https://doi.org/10.1051/0004-6361/202557760

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Tahun Terbit
2026
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en
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Semantic Scholar
DOI
10.1051/0004-6361/202557760
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