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The evolution of the mass-metallicity relation at z~3
R. Maiolino, T. Nagao, A. Grazian +14
We present preliminary results of an ESO-VLT large programme (AMAZE) aimed at determining the evolution of the mass-metallicity relation at z~3 by means of deep near-IR spectroscop…
The contribution of very massive high-redshift SWIRE galaxies to the stellar mass function
S. Berta, C. J. Lonsdale, M. Polletta +18
(Abridged) We selected high-z massive galaxies at 5.8 microns, in the SWIRE ELAIS-S1 field (1 sq. deg.). Galaxies with the 1.6 microns stellar peak redshifted into the IRAC bands (…
3-5 micron spectroscopy of obscured AGNs in ULIRGs
E. Sani, G. Risaliti, M. Salvati +6
We present the results of infrared L-band (3-4 micron) and M-band (4-5 micron) VLT-ISAAC spectroscopy of five bright Ultraluminous InfraRed Galaxies (ULIRGs) hosting an AGN. From o…
Molecular gas in QSO host galaxies at z>5
R. Maiolino, R. Neri, A. Beelen +10
We present observations with the IRAM Plateau de Bure Interferometer of three QSOs at z>5 aimed at detecting molecular gas in their host galaxies as traced by CO transitions. CO (5…
Dust covering factor, silicate emission and star formation in luminous QSOs
R. Maiolino, O. Shemmer, M. Imanishi +4
We present Spitzer IRS low resolution, mid-IR spectra of a sample of 25 high luminosity QSOs at 2<z<3.5. When combined with archival IRS observations of local, low luminosity type-…
Dust properties at z=6.3 in the host galaxy of GRB 050904
G. Stratta, R. Maiolino, F. Fiore +1
We investigate the dust extinction properties in the host galaxy of the Gamma-Ray Burst (GRB) GRB 050904 at z=6.29 by analyzing simultaneous broad band observations of the optical…
The HELLAS2XMM survey. X. The bolometric output of luminous obscured quasars: The Spitzer perspective
F. Pozzi, C. Vignali, A. Comastri +10
Aims: We aim at estimating the spectral energy distributions (SEDs) and the physical parameters related to the black holes harbored in eight high X-ray-to-optical (F_X/F_R>10) obsc…
A galaxy overdensity at z=0.401 associated with an X-ray emitting structure of Warm-Hot Intergalactic Medium
F. Mannucci, G. Bonnoli, L. Zappacosta +2
We present the results of spectroscopic observations of galaxies associated with the diffuse X-ray emitting structure discovered by Zappacosta et al. (2002). After measuring the re…
PAH emission and star formation in the host of the z~2.56 Cloverleaf QSO
D. Lutz, E. Sturm, L. J. Tacconi +7
We report the first detection of the 6.2micron and 7.7micron infrared `PAH' emission features in the spectrum of a high redshift QSO, from the Spitzer-IRS spectrum of the Cloverlea…
High-redshift Ly alpha emitters with a large equivalent width: Properties of i-dropout galaxies with an NB921-band depression in the Subaru Deep Field
Tohru Nagao, Takashi Murayama, Roberto Maiolino +11
We report new follow-up spectroscopy of i-dropout galaxies with an NB921-band depression found in the Subaru Deep Field. The NB921-depressed i-dropout selection method is expected…
A Spitzer IRS Low-Resolution Spectroscopic Search for Buried AGNs in Nearby Ultraluminous Infrared Galaxies - A Constraint on Geometry between Energy Sources and Dust -
Masatoshi Imanishi, C. C. Dudley, Roberto Maiolino +3
We present the results of Spitzer IRS low-resolution infrared 5-35 micron spectroscopy of nearby ultraluminous infrared galaxies (ULIRGs) at z < 0.15. We focus on the search for th…