Association of cold gas, massive galaxies, and AGNs in a filamentary protocluster traced by triple narrow-band imaging
Year: 2025
Type: preprint
Abstract: We investigate galaxy populations in the HS1700+64 protocluster at $z=2.30$, characterized by two prominent linear filaments traced by spatially extended Ly$α$ blobs. We conducted a wide area mapping of emission line galaxies across the protocluster using the unique combination of three matched narrow-band filters, corresponding to Ly$α$, H$α$, and [OIII] emission lines at $z=2.30$. We find that H$α$ emitters are strongly clustered at the intersection of the filaments, suggesting a protocluster core. In contrast, Ly$α$ emitters tend to avoid the dense region and the filaments, likely due to the resonant scattering of Ly$α$ photons by HII gas and/or enhanced dust attenuation in galaxies associated with these structures. These findings support a scenario in which cold gas flows via filaments and to the core, fed by the cold-stream mode accretion in the early phase of protocluster assembly, and promoting active star formation there. Further evidence of the scenario comes from the alignment of massive, evolved galaxies in those filaments traced by distant red galaxies, suggesting accelerated galaxy growth in the filaments in the early Universe. This study clearly shows observationally that accelerated galaxy formation takes place not only in the protocluster core but also in the associated surrounding filamentary structure. This underscores the critical role of large-scale filaments in efficiently accumulating the cold gas and channeling it to galaxies therein and to the protocluster core. Such vigorous gas assembly facilitates star formation activity and drives galaxy growth in the early stage of cluster formation.
Source: arXiv (Cornell University)
Authors: Daikuhara, Kazuki, Kodama, Tadayuki, Kusakabe, Haruka, Steidel, Charles C., Tanaka, Ichi, Kikuta, Satoshi, Umehata, Hideki, Shimakawa, Rhythm, Koyama, Yusei, Motohara, Kentaro, Konishi, Masahiro, Martinez, Jose Manuel Perez, Kubo, Mariko, Erb, Dawn, Takahashi, Kosuke, Fukushima, Keita
Institutions: Tohoku University, Japan Aerospace Exploration Agency, Institute of Space and Astronautical Science, National Institutes of Natural Sciences, National Astronomical Observatory of Japan, The University of Tokyo, California Institute of Technology, Nagoya University, Waseda University, Universidad de La Laguna, Instituto de Astrofísica de Canarias, Kwansei Gakuin University, University of Wisconsin–Milwaukee, Seoul National University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: Ministerio de Ciencia, Innovación y Universidades, European Commission, National Research Foundation, Ministry of Education, Culture, Sports, Science and Technology, National Research Foundation of Korea, National Astronomical Observatory of Japan, Japan Society for the Promotion of Science, European Regional Development Fund, Agencia Estatal de Investigación
Awards: G1337118460, G1496355786, Co-evolution of cosmic web filaments and galaxies in the early universe, G1749210197, G2262748287, Kinematics and ionization state of the circumgalactic medium around extremely-metal poor galaxies investigated with wide-field integral field spectroscopy, G2322199562, G2392852609, G2494697820, G3480869486, Towards Ultimate Subaru: Galaxy formation history probed by deep near-infrared imaging with wide-field adaptive optics, G3681454997, G3953790574, G4042783231, G425668148, G451917667, Exploring the Early Stages of Galaxy Formation with 21 cm Line Emission and Optical Spectroscopy, Galaxy evolution in the cosmic web revealed with JWST and ALMA, G5626594324, G5627313610, G5967599077, G6531013582, Comprehensive understanding of the formation history of structures in the Universe, Baryon Cycle Around Galaxies and Intergalactic Medium Probed with Narrowband Imaging, 狭帯域フィルターでひらく銀河・銀河間物質をめぐる物質循環の新展開, 古代説話における諸寺縁起の研究, G7863371703, Study of Galaxy Formation Activities at Cosmic Noon by Near-Infrared Integral Field Spectroscopy, G8497050386, Co-evolution of cosmic web filaments and galaxies in the early universe
OpenAlex ID: W7092115155
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