Bibcode
                                    
                            Beckman, J. E.; Zurita, A.
    Bibliographical reference
                                    How Does the Galaxy Work? A Galactic Tertulia with Don Cox and Ron Reynolds. Edited by Emilio J. Alfaro, Instituto de Astrofisica de Andalucía (CSIC), Granada, Spain; Enrique Pérez, Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain; José Franco, Instituto de Astronomía, UNAM, México. ASTROPHYSICS AND SPACE SCIENCE LIBRARY Volume 315. ISBN 1-4020-2619-6 (HB); ISBN 1-4020-2620-X (e-book). Published by Kluwer Academic Publishers, Dordrecht, The Netherlands, 2004, p.88
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                        10
            
                        2004
            
  Citations
                                    0
                            Refereed citations
                                    0
                            Description
                                    We present observational evidence, from Hαin face-on galaxies,
which strongly favours the hypothesis that escaping photons from H II
regions are the basic cause of the ionization of the diffuse ionized gas
in galaxy discs, and by implication are the chief cause of the Reynolds
layer in the Milky Way, and refer the reader to models based on these
observations which go further, geometrically, to confirm this
conclusion.