Speaker
Anna Cibinel
(Astronomy Centre, U. of Sussex)
Description
Key aspects of galaxy evolution including bulge formation and quenching may be
regulated by the dynamics of large star forming clumps which are almost ubiquitous in
the gas-rich ISM medium of normal high redshift galaxies. The impact of clump-driven
dynamical processes on the evolution of galaxies depends crucially on whether these
giant clumps are transient phenomena or not. Clump lifetimes are believed to vary with
the amount of cold gas in these clumps, with the clump internal star formation
efficiency and the strength of stellar feedback.
I will present results from deep, 0.3 arcsecond resolution ALMA observations of the
molecular gas content in a z=1.5 clumpy, main-sequence disk galaxy. Combined with
HUDF imaging in the optical-NIR and integral field spectroscopy observation with
VLT/SINFONI in the J+H bands, these provide a unique dataset for the study high
redshift gas properties down to kpc scales.
I will discuss the implications of these observations in terms of the Schmidt-Kennicutt
law on clump scales, the ability of clumps to endure mass loss by outflows and local
variations in gas reservoirs between the star-forming clumps and the more evolved
central bulge component. I will also discuss our constraints on the level of
turbulence in
the clump ISM and how these lead to insight into feedback processes acting on the
clumps.
Author
Anna Cibinel
(Astronomy Centre, U. of Sussex)
Co-authors
E. Daddi
(CEA, Saclay)
E. Le Floc'h
(CEA, Saclay)
F. Bournaud
(CEA, Saclay)
M. Pannella
(LMU, Munich)
M. Sargent
(Astronomy Centre, U. of Sussex)
P.-A. Duc
(CEA, Saclay)
S. Juneau
(CEA, Saclay)
