As part of our quest for high-redshift radio galaxies (HzRGs), we present the results obtained from optical spectroscopy leading to the confirmation of one HzRG candidate selected using the Lyman break technique. The optical emission, associated with the radio source TXS 2354+015, exhibits a prominent drop in the r band, which is characteristic of sources at z The optical spectrum shows a bright asymmetric emission line, with a large equivalent width of ∼ 900Å. Its identification with the łya line is confirmed by the detection of the NVłambda1640, leading to a redshift estimate of z=4.946. Its broadband radio spectrum is well reproduced using a power law with a slope of 0.94. The radio luminosity at the rest frame frequency of 500 MHz is 6.2 10^ 29 This result makes this source the most powerful radio galaxy currently known.
High-redshift radio galaxies (HzRGs) are among the earliest and most massive galaxies whose powerful radio emission allows us to probe the large-scale structure, galaxy evolution, and the epoch of reionisation. We present a new sample of HzRG candidates constructed using the 1.28 GHz data from the MeerKAT Galaxy Clus...
Vasco Cossa, K. Knowles, O. Smirnov· Monthly notices of the Royal...· 0 citations
High-redshift radio galaxies (HzRGs) are among the most powerful radio sources, and are associated with the most massive galaxies and dense environments at redshifts z,≳,1. They are ideal laboratories for studying how active galactic nucleus (AGN) events can shape the evolution of galaxies, as intense radiation, jets,...
Bruno Dall'Agnol de Oliveira, D. Wylezalek, P. Kukreti et al.· Astronomy & Astrophysics· 0 citations
We present the largest statistical spectroscopic sample of radio quasars at 4.7<z<6.7 to date. These have been selected from a dedicated Dark Energy Survey Instrument (DESI) target program and provide a robust sample to study the influence of radio jets on early quasar evolution. Using low-frequency radio data from the...
A. Gloudemans, Jin-Yi Yang, David M. Alexander et al.· 0 citations
The finding that galaxies in the first 500Myr were much more numerous and/or brighter than expected is often cited as one of the main discoveries of the James Webb Space Telescope in its first four years of operation. This result is now solidly based on an impressive number of surveys that have detected, spectroscopica...
We present a spectral analysis of a large sample of low-redshift type 1 active galactic nuclei (AGNs) selected from the first data release of the Dark Energy Spectroscopic Instrument (DESI DR1). For objects at $z\le0.9$, we perform spectral fitting and ML-assisted refinement, yielding 114,754 type 1 AGNs. We use two fi...
Zhu-Heng Yao, Wei-Ji Guo, S. Zhai et al.· 0 citations
