Catalán-Torrecilla, C.; Gil de Paz, A.; Castillo-Morales, A.; Méndez-Abreu, J.; Falcón-Barroso, J.; Costantin, L.; de Lorenzo-Cáceres, A.; Florido, E.; García-Benito, R.; Husemann, B.; Iglesias-Páramo, J.; Kennicutt, R. C.; Mast, D.; Pascual, S.; Ruiz-Lara, T.; Sánchez-Menguiano, L.; Sánchez, S. F.; Walcher, C. J.; Bland-Hawthorn, J.; Duarte Puertas, S.; Marino, R. A.; Masegosa, J.; Sánchez-Blázquez, P.; CALIFA Collaboration
Bibliographical reference
The Astrophysical Journal, Volume 848, Issue 2, article id. 87, 17 pp. (2017).
Description
We estimate the current extinction-corrected Hα star formation
rate (SFR) of the different morphological components that shape galaxies
(bulges, bars, and disks). We use a multicomponent photometric
decomposition based on Sloan Digital Sky Survey imaging to Calar Alto
Legacy Integral Field Area Integral Field Spectroscopy (IFS) datacubes
for a sample of 219 galaxies. This analysis reveals an enhancement of
the central SFR and specific SFR (sSFR = SFR/M ⋆) in
barred galaxies. Along the main sequence, we find that more massive
galaxies in total have undergone efficient suppression (quenching) of
their star formation, in agreement with many studies. We discover that
more massive disks have had their star formation quenched as well. We
evaluate which mechanisms might be responsible for this quenching
process. The presence of type 2 AGNs plays a role at damping the sSFR in
bulges and less efficiently in disks. Also, the decrease in the sSFR of
the disk component becomes more noticeable for stellar masses around
{10}10.5 {M}⊙ ; for bulges, it is already
present at ˜ {10}9.5 {M}⊙ . The analysis
of the line-of-sight stellar velocity dispersions (σ) for the
bulge component and of the corresponding Faber-Jackson relation
shows that AGNs tend to have slightly higher σ values than
star-forming galaxies for the same mass. Finally, the impact of
environment is evaluated by means of the projected galaxy density,
Σ5. We find that the SFR of both bulges and disks
decreases in intermediate- to high-density environments. This work
reflects the potential of combining IFS data with 2D multicomponent
decompositions to shed light on the processes that regulate the SFR.
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