Intense starburst

https://www.legacysurvey.org//viewer/?ra=58.2617&dec=-35.5371&layer=ls-dr9&zoom=15

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Central brighter object in Simbad [6dFGS gJ035303.1-353213] galaxy
In VizieR is in ā€œ6dF galaxy survey final redshift release (Jones+, 2009)ā€ and there is a link to spectre at Display 6dF results
Iā€™m absolutely not expert but I 'd had expected a prominent H alpha that not seems to be present.
Any expert help and explanation?
Thanks!