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American Astronomical Society, Astrophysical Journal Letters, 2(934), p. L26, 2022

DOI: 10.3847/2041-8213/ac82e5

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Lyα Halos around [O iii]-selected Galaxies in HETDEX

Journal article published in 2022 by Maja Lujan Niemeyer ORCID, William P. Bowman ORCID, Robin Ciardullo ORCID, Max Gronke ORCID, Eiichiro Komatsu ORCID, Maximilian Fabricius ORCID, Daniel J. Farrow ORCID, Steven L. Finkelstein ORCID, Karl Gebhardt ORCID, Caryl Gronwall ORCID, Gary J. Hill ORCID, Chenxu Liu ORCID, Erin Mentuch Cooper ORCID, Donald P. Schneider ORCID, Sarah Tuttle ORCID and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract We present extended Lyα emission out to 800 kpc of 1034 [O iii]-selected galaxies at redshifts 1.9 < z < 2.35 using the Hobby–Eberly Telescope Dark Energy Experiment. The locations and redshifts of the galaxies are taken from the 3D-HST survey. The median-stacked surface brightness profile of the Lyα emission of the [O iii]-selected galaxies agrees well with that of 968 bright Lyα-emitting galaxies (LAEs) at r > 40 kpc from the galaxy centers. The surface brightness in the inner parts (r < 10 kpc) around the [O iii]-selected galaxies, however, is 10 times fainter than that of the LAEs. Our results are consistent with the notion that photons dominating the outer regions of the Lyα halos are not produced in the central galaxies but originate outside of them.