Bibcode
Shapiro, Kristen L.; Falcón-Barroso, J.; van de Ven, Glenn; de Zeeuw, P. Tim; Sarzi, Marc; Bacon, Roland; Bolatto, Alberto; Cappellari, Michele; Croton, Darren; Davies, Roger L.; Emsellem, Eric; Fakhouri, Onsi; Krajnović, Davor; Kuntschner, Harald; McDermid, Richard M.; Peletier, Reynier F.; van den Bosch, Remco C. E.; van der Wolk, Guido
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 402, Issue 4, pp. 2140-2186.
Advertised on:
3
2010
Número de citas
110
Número de citas referidas
102
Descripción
We combine SAURON integral field data of a representative sample of
local early-type, red sequence galaxies with Spitzer/Infrared Array
Camera imaging in order to investigate the presence of trace star
formation in these systems. With the Spitzer data, we identify galaxies
hosting low-level star formation, as traced by polycyclic aromatic
hydrocarbon emission, with measured star formation rates that compare
well to those estimated from other tracers. This star formation proceeds
according to established scaling relations with molecular gas content,
in surface density regimes characteristic of disc galaxies and
circumnuclear starbursts. We find that star formation in early-type
galaxies happens exclusively in fast-rotating systems and occurs in two
distinct modes. In the first, star formation is a diffuse process,
corresponding to widespread young stellar populations and high molecular
gas content. The equal presence of co- and counter-rotating components
in these systems strongly implies an external origin for the
star-forming gas, and we argue that these star formation events may be
the final stages of (mostly minor) mergers that build up the bulges of
red sequence lenticulars. In the second mode of star formation, the
process is concentrated into well-defined disc or ring morphologies,
outside of which the host galaxies exhibit uniformly evolved stellar
populations. This implies that these star formation events represent
rejuvenations within previously quiescent stellar systems. Evidence for
earlier star formation events similar to these in all fast-rotating
early-type galaxies suggests that this mode of star formation may be
common to all such galaxies, with a duty cycle of roughly 1/10, and
likely contributes to the embedded, corotating inner stellar discs
ubiquitous in this population.
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