Site Map
Contacts
Follow us on Facebook Follow us on Twitter YouTube channel
Centro de Astrofísica da Universidade do Porto
Bulge Growth and Quenching since z = 2.5 in CANDELS/3D-HST

Philipp Lang
MPIE/Munich

Abstract
Understanding the processes leading to quenching of star formation in actively star-forming galaxies is a central issue in galaxy evolution today. In this talk I will present recent results of our study exploiting the synergy between deep panchromatic imaging from the CANDELS survey combined with redshift information from 3D-HST, in order to explore the connection between galaxy structure and quenching for massive galaxies at high redshift. We fit 2D single Sérsic as well as combined bulge + disk models to both rest-frame optical light and stellar mass distributions, using a sample of 6764 massive (M>10^10Mstar) galaxies at 0.5 < z < 2.5. We confirm an increased bulge prominence among quiescent galaxies and furthermore observe an increase of the typical Sérsic index and bulge-to-total ratio among star-forming galaxies above 10^11 Mstar,suggesting that significant bulge growth precedes the quenching of star-formation. We also demonstrate that the bulge mass is a more reliable predictor of the star-forming versus quiescent state of a galaxy than the total stellar mass. I also discuss how these results hint on possible quenching mechanisms such as AGN feedback, using predictions from a state-of-the-art semi-analytic model.

19 November 2014, 13:30

Centro de Astrofísica
Rua das Estrelas
4150-762 Porto

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

Proceed on CAUP's website|Go to IA website