English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse
  1. View item / 
  2. Item Summary

Item

ITEM ACTIONSEXPORT
Add to Basket
  Local TagsRelease HistoryDetailsSummary

Released
Journal Article

Rejuvenated galaxies with very old bulges at the origin of the bending of the main sequence and of the `green valley'

MPS-Authors

Mancini,  Chiara
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Daddi,  Emanuele
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Juneau,  Stéphanie
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Renzini,  Alvio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rodighiero,  Giulia
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cappellari,  Michele
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rodríguez-Muñoz,  Lucía
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Liu,  Daizhong
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pannella,  Maurilio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Baronchelli,  Ivano
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Franceschini,  Alberto
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bergamini,  Pietro
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

D'Eugenio,  Chiara
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Puglisi,  Annagrazia
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019MNRAS.489.1265M
(Any fulltext)

Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Mancini, C., Daddi, E., Juneau, S., Renzini, A., Rodighiero, G., Cappellari, M., et al. (2019). Rejuvenated galaxies with very old bulges at the origin of the bending of the main sequence and of the `green valley'. Monthly Notices of the Royal Astronomical Society, 489, 1265-1290.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D07E-3
Abstract
We investigate the nature of star-forming galaxies with reduced specific star formation rate (sSFR) and high stellar masses, those `green valley' objects that seemingly cause a reported bending, or flattening, of the star-forming main sequence. The fact that such objects host large bulges recently led some to suggest that the internal formation of bulges was a late event that induced the sSFRs of massive galaxies to drop in a slow downfall, and thus the main sequence to bend. We have studied in detail a sample of 10 galaxies at 0.45 < z < 1 with secure SFR from Herschel, deep Keck optical spectroscopy, and HST imaging from CANDELS allowing us to perform multiwavelength bulge to disc decomposition, and to derive star formation histories for the separated bulge and disc components. We find that the bulges hosted in these systems below main sequence are virtually all maximally old, with ages approaching the age of the Universe at the time of observation, while discs are young (< T50> ~ 1.5 Gyr). We conclude that, at least based on our sample, the bending of the main sequence is, for a major part, due to rejuvenation, and we disfavour mechanisms that postulate the internal formation of bulges at late times. The very old stellar ages of our bulges suggest a number density of early-type galaxies at z = 1-3 higher than actually observed. If confirmed, this might represent one of the first direct validations of hierarchical assembly of bulges at high redshifts.