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Lyα nebulae in HETDEX: the largest statistical census bridging Lyα halos and blobs across cosmic noon

The Hobby-Eberly Dark Energy Experiment (HETDEX) is an untargeted ∼540 deg2 spectroscopic survey of Lyα emission in the 1.9 < z < 3.5 Universe. In surface brightness, this survey reaches 1σ Lyα sensitivities of ∼2-5 × 10−18 erg s−1 cm, allowing large samples of extended Lyα nebulae (LAN) to be...

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Detalles Bibliográficos
Autores principales: Mentuch Cooper, Erin (Autor) , Gebhardt, Karl (Autor) , Davis, Dustin (Autor) , Ciardullo, Robin (Autor) , Byrohl, Chris (Autor) , Liu, Chenxu (Autor) , Debski, Maya H. (Autor) , Chávez Ortiz, Óscar A. (Autor) , Fabricius, Maximilian (Autor) , Farrow, Daniel J. (Autor) , Finkelstein, Steven L. (Autor) , Gronwall, Caryl (Autor) , Hill, Gary J. (Autor) , Lujan Niemeyer, Maja (Autor) , McKay, Brianna (Autor) , Mukae, Shiro (Autor) , Ouchi, Masami (Autor) , Röttgering, Huub (Autor) , Schneider, Donald P. (Autor) , Tuttle, Sarah (Autor) , Wisotzki, Lutz (Autor) , Zeimann, Gregory (Autor) , Zhai, Sai (Autor)
Formato: Article (Journal)
Lenguaje:inglés
Publicado: March 11, 2026
In: The astrophysical journal
Year: 2026, Volumen: 1000, Número: 1, Pages: 1-21
ISSN:1538-4357
DOI:10.3847/1538-4357/ae44f3
Acceso en línea:Verlag, kostenfrei, Volltext: https://doi.org/10.3847/1538-4357/ae44f3
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Notas de Autor:Erin Mentuch Cooper, Karl Gebhardt, Dustin Davis, Robin Ciardullo, Chris Byrohl, Chenxu Liu, Maya H. Debski, Óscar A. Chávez Ortiz, Maximilian Fabricius, Daniel J. Farrow, Steven L. Finkelstein, Caryl Gronwall, Gary J. Hill, Maja Lujan Niemeyer, Brianna McKay, Shiro Mukae, Masami Ouchi, Huub Röttgering, Donald P. Schneider, Sarah Tuttle, Lutz Wisotzki, Gregory Zeimann, and Sai Zhai
Descripción
Sumario:The Hobby-Eberly Dark Energy Experiment (HETDEX) is an untargeted ∼540 deg2 spectroscopic survey of Lyα emission in the 1.9 < z < 3.5 Universe. In surface brightness, this survey reaches 1σ Lyα sensitivities of ∼2-5 × 10−18 erg s−1 cm, allowing large samples of extended Lyα nebulae (LAN) to be studied. We selected a sample of 70,691 Lyα-emitting galaxies (LAEs) with an emission-line signal-to-noise ratio greater than 6 and modeled the Lyα emission as a point-source component with an optional exponential envelope. Half (∼47.5%) of the LAE sample (33,612 objects) exhibits significant extended emission and is best fit by the two-component model. The fraction of resolved sources increases with Lyα flux and luminosity. Their isophotal areas range from 10 to 130 arcsec2 (median 15 arcsec2), with integrated Lyα fluxes from 6 to 2000 × 10−17 erg s−1 cm−2 (median 20 × 10−17 erg s−1 cm−2). Comparison between point-spread function-weighted and isophotal flux measurements shows that the HETDEX pipeline underestimates the total Lyα flux by ∼30% on average, reflecting the substantial halo contribution in extended sources. Approximately 420 LANs are found per deg2 over 79.5 deg2 of noncontiguous sky. About 12% of resolved sources show active galactic nuclei signatures and are bright in Lyα and continuum. The remaining 88% span a wide range of morphologies and often lack continuum counterparts. Exponential scale lengths show no strong correlation with Lyα flux or luminosity (median 11.6 ± 1.9 kpc). Only 2.9% of the full S/N > 6 LAE population with ancillary data have radio counterparts, but 64% of those are found to be extended, with the radio fraction increasing with Lyα size. We present a catalog of all modeled sources, with their positions, redshifts, luminosities, and structural parameters for over 70,000 LAEs consisting of 33,000 spatially extended LAN. The catalog can be found at https://hetdex.org/data-results/ and in the online version of this paper.
Notas:Gesehen am 12.08.2026
Descripción Física:Online Resource
ISSN:1538-4357
DOI:10.3847/1538-4357/ae44f3

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