TL;DR
This paper discusses recent findings from GALEX showing that many bulges in early-type galaxies and spirals exhibit signs of recent star formation, challenging the traditional view of bulges as quiescent structures.
Contribution
It provides new observational evidence of widespread recent star formation in galaxy bulges, highlighting differences between massive and smaller bulges.
Findings
Up to 30% of bulges are UV-bright indicating recent star formation.
Smaller bulges and spiral bulges show higher fractions of recent star formation.
Massive bulges like brightest cluster galaxies are mostly free of young stars.
Abstract
Early-type galaxies, considered as large bulges, have been found to have had a much-more-than-boring star formation history in recent years by the UV satellite GALEX. The most massive bulges, brightest cluster galaxies, appear to be relatively free of young stars. But smaller bulges, normal ellipticals and lenticulars, often show unambiguous sign of recent star formation in their UV flux. The fraction of such UV-bright bulges in the volume-limited sample climbs up to the staggering 30%. The bulges of spirals follow similar trends but a larger fraction showing signs of current and recent star formation. The implication on the bulge formation and evolution is discussed.
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