Coincidence between morphology and star formation activity through cosmic time: the impact of the bulge growth

Paola Dimauro, Emanuele Daddi, Francesco Shankar, Andrea Cattaneo, Marc Huertas-Company, Mariangela Bernardi, Fernando Caro, Renato Dupke, Boris Häußler, Evelyn Johnston, Arianna Cortesi, Simona Mei, Reynier Peletier

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)
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The origin of the quenching in galaxies is still highly debated. Different scenarios and processes are proposed. We use multiband (400-1600 nm) bulge-disc decompositions of massive galaxies in the redshift range 0 < z < 2 to explore the distribution and the evolution of galaxies in the $\log \, {\rm SFR-log}\: M_{*}$ plane as a function of the stellar mass weighted bulge-to-total ratio ($B/T_{M_{*}}$) and also for internal galaxy components (bulge/disc) separately. We find evidence of a clear link between the presence of a bulge and the flattening of the main sequence in the high-mass end. All bulgeless galaxies ($B/T_{M_{*}}$ < 0.2) lie on the main sequence, and there is little evidence of a quenching channel without bulge growth. Galaxies with a significant bulge component ($B/T_{M_{*}}$ > 0.2) are equally distributed in number between star forming and passive regions. The vast majority of bulges in the main-sequence galaxies are quiescent, while star formation is localized in the disc component. Our current findings underline a strong correlation between the presence of the bulge and the star formation state of the galaxy. A bulge, if present, is often quiescent, independently of the morphology or the star formation activity of the host galaxy. Additionally, if a galaxy is quiescent, with a large probability, is hosting a bulge. Conversely, if the galaxy has a discy shape is highly probable to be star forming.
Original languageEnglish
Pages (from-to)256-281
Number of pages26
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - 1-Jun-2022


  • galaxies: evolution
  • galaxies: star formation
  • galaxies: structure
  • galaxies: stellar content; galaxies: disc
  • galaxies: bulge
  • galaxies: high-redshift
  • Astrophysics - Astrophysics of Galaxies


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