Galaxy formation and evolution

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The Evolutionary Map of the Universe: A new radio atlas for the southern hemisphere sky

(2025)

Authors:

AM Hopkins, A Kapinska, J Marvil, T Vernstrom, JD Collier, RP Norris, YA Gordon, SW Duchesne, L Rudnick, N Gupta, E Carretti, CS Anderson, S Dai, G Gürkan, D Parkinson, I Prandoni, S Riggi, CS Saraf, YK Ma, MD Filipović, G Umana, B Bahr-Kalus, BS Koribalski, E Lenc, A Ingallinera, J Afonso, A Ahmad, UT Ahmed, EL Alexander, H Andernach, J Asorey, AJ Battisti, M Bilicki, A Botteon, MJI Brown, M Brüggen, M Cowley, KC Dage, CL Hale, MJ Hardcastle, R Kothes, S Lazarević, Y-T Lin, KJ Luken, JP Moss, J Prathap, SF Rahman, TH Reiprich, CJ Riseley, M Salvato, N Seymour, SS Shabala, DJB Smith, M Vaccari, J Th van Loon, OI Wong, RZE Alsaberi, AD Asher, BD Ball, D Barbosa, N Biava, AC Bradley, R Carvajal, EJ Crawford, TJ Galvin, MT Huynh, DA Leahy, I Matute, VA Moss, C Pappalardo, ZJ Smeaton, V Velović, T Zafar

SAPPHIRES: Extremely Metal-Poor Galaxy Candidates with $12+{\rm log(O/H)}<7.0$ at $z\sim5-7$ from Deep JWST/NIRCam Grism Observations

(2025)

Authors:

Tiger Yu-Yang Hsiao, Fengwu Sun, Xiaojing Lin, Dan Coe, Eiichi Egami, Daniel J Eisenstein, Yoshinobu Fudamoto, Andrew J Bunker, Xiaohui Fan, Yuichi Harikane, Jakob M Helton, Koki Kakiichi, Yichen Liu, Weizhe Liu, Roberto Maiolino, Masami Ouchi, Wei Leong Tee, Feige Wang, Yunjing Wu, Yi Xu, Jinyi Yang, Yongda Zhu
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Abundant Population of Broad H$\alpha$ Emitters in the GOODS-N Field Revealed by CONGRESS, FRESCO, and JADES

(2025)

Authors:

Junyu Zhang, Eiichi Egami, Fengwu Sun, Xiaojing Lin, Jianwei Lyu, Yongda Zhu, Pierluigi Rinaldi, Yang Sun, Andrew J Bunker, Rachana Bhatawdekar, Jakob M Helton, Roberto Maiolino, Zheng Ma, Brant Robertson, Sandro Tacchella, Giacomo Venturi, Christina C Williams, Chris Willott

The Large-scale Environments of Low-luminosity AGNs at $3.9 < z < 6$ and Implications for Their Host Dark Matter Halos from a Complete NIRCam Grism Redshift Survey

(2025)

Authors:

Xiaojing Lin, Xiaohui Fan, Fengwu Sun, Junyu Zhang, Eiichi Egami, Jakob M Helton, Feige Wang, Haowen Zhang, Andrew J Bunker, Zheng Cai, Zhiyuan Ji, Xiangyu Jin, Roberto Maiolino, Maria Anne Pudoka, Pierluigi Rinaldi, Brant Robertson, Sandro Tacchella, Wei Leong Tee, Yang Sun, Christopher NA Willmer, Chris Willott, Yongda Zhu

The origin of the very-high-energy radiation along the jet of Centaurus A

Monthly Notices of the Royal Astronomical Society Oxford University Press 539:4 (2025) 3697-3713

Authors:

Cainã de Oliveira, James H Matthews, Vitor de Souza

Abstract:

As the closest known active galactic nucleus, Centaurus A (Cen A) provides a rich environment for astrophysical exploration. It has been observed across wavelengths from radio to gamma-rays, and indications of ongoing particle acceleration have been found on different scales. Recent measurements of very-high-energy (VHE) gamma-rays ( GeV) by the HESS observatory have inferred the presence of ultra-relativistic electrons along Cen A’s jet, yet the underlying acceleration mechanism remains uncertain. Various authors have proposed that jet substructures, known as knots, may serve as efficient particle accelerators. In this study, we investigate the hypothesis that knots are the particle acceleration sites along Cen A’s jets. We focus on stationary knots, and assume that they result from interactions between the jet and the stellar winds of powerful stars. By combining relativistic hydrodynamic simulations and shock acceleration theory with the radio and X-ray data, we compare theoretical predictions with morphological and spectral data from different knots. We estimate the maximum electron energy and the resulting VHE gamma-ray emission. Our findings suggest that electrons accelerated at the knots are responsible for the gamma-ray spectrum detected in the VHE band.
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