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During the start of a survey program using FORS2 long slit spectroscopy onplanetary nebulae (PN) and their haloes, we serendipitously discovered sixbackground emission line galaxies (ELG) with redshifts of z = 0.2057, 0.3137,0.37281, 0.4939, 0.7424 and 0.8668. Thus they clearly do not belong to a commoncluster structure. We derived the major physical properties of the targets.Since the used long slit covers a sky area of only 570 arcsec^2, we discussfurther potential of serendipitous discoveries in archival data, beside thedeep systematic work of the ongoing and upcoming big surveys. We conclude thatarchival data provide a decent potential for extending the overall data on ELGswithout any selection bias.

Emission line galaxies behind the planetary nebula IC 5148: Potential for a serendipity survey with archival data