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The double AGN in NGC 6240 revealed through 3-5 micron spectroscopy
G. Risaliti, E. Sani, R. Maiolino +7
We present 3-5 micron spectroscopy of the interacting system NGC 6240, showing the presence of two active galactic nuclei. The brightest (southern) nucleus shows up with a starburs…
Gaseous abundances in M82
Piero Ranalli, Andrea Comastri, Livia Origlia +2
We present the preliminary analysis of a deep (100ks) XMM-Newton observation of M82. The spatial distribution of the abundances of chemical elements (Fe, O, Ne, Mg, Si, S) is inves…
Unveiling the nature of Ultraluminous Infrared Galaxies with 3-4 micron spectroscopy
G. Risaliti, R. Maiolino, A. Marconi +6
We present the results of L-band spectroscopical observations of local bright ULIRGs, performed with ISAAC at the VLT. We discuss the L-band spectral features of seven single sourc…
The HELLAS2XMM survey. IX. Spectroscopic identification of super-EROs hosting AGNs
R. Maiolino, M. Mignoli, L. Pozzetti +12
We present VLT near-IR spectroscopic observations of three X-ray sources characterized by extremely high X-ray-to-optical ratios (X/O>40), extremely red colors (6.3<R-K<7.4, i.e. E…
The HELLAS2XMM survey. VII. The hard X-ray luminosity function of AGN up to z=4: more absorbed AGN at low luminosities and high redshifts
F. La Franca, F. Fiore, A. Comastri +14
We have determined the cosmological evolution of the density of AGN and of their Nh distribution as a function of the un-absorbed 2-10 keV luminosity up to redshift 4. We used the…
Gas Metallicity in the Narrow-Line Regions of High-Redshift Active Galactic Nuclei
Tohru Nagao, Roberto Maiolino, Alessandro Marconi
We analyze optical (UV rest-frame) spectra of X-ray selected narrow-line QSOs at redshift 1.5 < z < 3.7 found in the Chandra Deep Field South and of narrow-line radio galaxies at r…
An Observational Pursuit for Population III Stars in a Ly_alpha Emitter at z=6.33 through HeII Emission
Tohru Nagao, Kentaro Motohara, Roberto Maiolino +5
We present a very deep near-infrared spectroscopic observation of a strong Ly_alpha emitter at z=6.33, SDF J132440.6+273607, which we used to search for HeII 1640. This emission li…
First detection of [CII]158um at high redshift: vigorous star formation in the early universe
R. Maiolino, P. Cox, P. Caselli +10
We report the detection of the 2P_3/2 -> 2P_1/2 fine-structure line of C+ at 157.74 micron in SDSSJ114816.64+525150.3 (hereafter J1148+5251), the most distant known quasar, at z=6.…
A search for changing-look AGN in the Grossan catalog
S. Bianchi, M. Guainazzi, G. Matt +4
We observed with XMM-Newton 4 objects selected from the Grossan catalog, with the aim to search for new 'changing-look' AGN. The sample includes all the sources which showed in sub…
Improved Templates for Photometric Redshifts of Submm Sources
L. K. Hunt, R. Maiolino
There is growing evidence that some star-forming galaxies at z>1 are characterized by high efficiencies and specific star formation rates. In the local universe, these traits are s…
A changing inner radius in the accretion disc of Q0056-363?
G. Matt, D. Porquet, S. Bianchi +4
Q0056-363 is the most powerful X-ray quasar known to exhibit a broad, likely relativistic iron line (Porquet & Reeves 2003). It has been observed twice by XMM-, three and h…
Constraining the thermal history of the Warm-Hot Intergalactic Medium
L. Zappacosta, R. Maiolino, A. Finoguenov +3
We have identified a large-scale structure traced by galaxies at z=0.8, within the Lockman Hole, by means of multi-object spectroscopic observations. By using deep XMM images we ha…
The optical-to-radio spectral energy distributions of low-metallicity blue compact dwarf galaxies
Leslie Hunt, Simone Bianchi, Roberto Maiolino
We present global spectral energy distributions (SEDs) from 0.3m to 90cm for a sample of seven low-metallicity blue compact dwarf galaxies (BCDs). In addition to data compiled f…