Actas de congresos
PAH lines at high redshift as galaxy evolution marker
Fecha
2013Registro en:
Latin American Regional IAU Meeting, 14, 2013, Florianópolis.
0185-1101
Autor
Santos, Jullian Henrique Barbosa dos
Friaca, Amancio Cesar Santos
Institución
Resumen
Based in chemodynamical models for galaxy evolution,
we studied the formation of PAH lines at high
redshifts. The model considers carbon and silicon
grains, and also PAH molecules. It distinguishes
diffuse ISM the molecular clouds associated to star
forming regions. The PAH lines provide a good signature
of the evolutionary stage of galaxies, star formation
rate, in addition to allowing the assessment
the relative importance for of AGN and stellar emission
on the output of the galaxy. In particular, the
line ratio 11.3/7.7 μm is a good marker of the age
of high redshift galaxies. We expected that our calculations
provide some benchmarks both for future
observations both with ground and satellite instruments.
The ages derived in this way for high redshift
objects could be used to test dark energy models. In
addition to the cosmological applications, the observations
of the PAH features could be used to check
the charge state of PAHs. Apparently, anions and
neutrals are favored over cations.