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An ionized superbubble powered by a protocluster at z=6.5

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Rodríguez Espinosa, J.M. and Mas-Hesse, J.M. and Salvador-Solé, E. and Calvi, R. and Manrique, A. and Chanchaiworawit, K. and Guzmán, R. and Gallego Maestro, Jesús and Herrero, A. and Marín Franch, A. (2020) An ionized superbubble powered by a protocluster at z=6.5. Monthly notices of The Royal Astronomical Society, 495 (1). L17-L21. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1093/mnrasl/slaa045


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Abstract

We show herein that a proto-cluster of Ly α emitting galaxies, spectroscopically confirmed at redshift 6.5, produces a remarkable number of ionizing continuum photons. We start from the Ly α fluxes measured in the spectra of the sources detected spectroscopically. From these fluxes, we derive the ionizing emissivity of continuum photons of the protocluster, which we compare with the ionizing emissivity required to reionize the protocluster volume. We find that the sources in the protocluster are capable of ionizing a large bubble, indeed larger than the volume occupied by the protocluster. For various calculations, we have used the model AMIGA, in particular to derive the emissivity of the Lyman continuum photons required to maintain the observed volume ionized. Besides, we have assumed the ionizing photons escape fraction given by AMIGA at this redshift.


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© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We want to thank an anonymous referee for his/her helpful comments and suggestions, which helped to significantly improve the manuscript. RC, JMRE, ESS, and AM acknowledge support from the Spanish State Research Agency under grant AYA2015-70498- C2-1. Besides, JMRE is supported under grant number AYA2017- 84061-P. JMMH is funded by Spanish State Research Agency grants ESP2017-87676-C5-1-R and MDM-2017-0737 (Unidad de Excelencia María de Maeztu CAB). We are indebted to the Severo Ochoa Programme at the IAC. Based on observations made with the Gran Telescopio Canarias (GTC), installed in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofísica de Canarias, in the island of La Palma.

Uncontrolled Keywords:Continuum escape fraction; Alpha emitters; Galaxies; Redshift; Spectroscopy; Constraints; Universe.
Subjects:Sciences > Physics > Astrophysics
ID Code:61313
Deposited On:03 Jul 2020 06:12
Last Modified:03 Jul 2020 08:12

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