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Metallicity Evolution of Active Galactic Nuclei
Tohru Nagao, Roberto Maiolino, Alessandro Marconi
In this contribution we report our recent investigation of the gas metallicity in active galactic nuclei and its dependence on luminosity and redshift. We compile large spectroscop…
The HELLAS2XMM survey.VIII. Optical identifications of the extended sample
F. Cocchia, F. Fiore, C. Vignali +14
(Abridged) We present the results of the photometric and spectroscopic identification of 110 hard X-ray selected sources (6e-15<F(2-10 keV)<4e-14 cgs) from 5 additional XMM-Newton…
A NICMOS search for obscured Supernovae in starburst galaxies
G. Cresci, F. Mannucci, M. Della Valle +1
The detection of obscured supernovae (SNe) in near-infrared monitoring campaigns of starburst galaxies has shown that a significant fraction of SNe is missed by optical surveys. Ho…
Far-infrared characterization of an ultra-luminous starburst associated with a massively-accreting black hole at z=1.15
E. Le Floc'h, C. N. A. Willmer, K. Noeske +25
As part of the "All Wavelength Extended Groth Strip International Survey" (AEGIS), we describe the panchromatic characterization of an X-ray luminous active galactic nucleus (AGN)…
Evidence for strong evolution of the cosmic star formation density at high redshift
F. Mannucci, H. Buttery, R. Maiolino +2
Deep HST/ACS and VLT/ISAAC data of the GOODS-South field were used to look for high-redshift galaxies in the rest-frame UV wavelength range and to study the evolution of the cosmic…
The Hard X-ray Spectral Slope as an Accretion-Rate Indicator in Radio-Quiet Active Galactic Nuclei
Ohad Shemmer, W. N. Brandt, Hagai Netzer +2
We present new XMM-Newton observations of two luminous and high accretion-rate radio-quiet active galactic nuclei (AGNs) at z~2. Together with archival X-ray and rest-frame optical…
Metals and dust in high redshift AGNs
R. Maiolino, T. Nagao, A. Marconi +7
We summarize some recent results on the metallicity and dust properties of Active Galactic Nuclei (AGN) at high redshift (1<z<6.4). By using the spectra of more than 5000 QSOs from…
Gas metallicity diagnostics in star-forming galaxies
Tohru Nagao, Roberto Maiolino, Alessandro Marconi
Generally the gas metallicity in distant galaxies can only be inferred by using a few prominent emission lines. Various theoretical models have been used to predict the relationshi…