Alessandro Marconi

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We have obtained long-slit observations of the circumnuclear region of M87 at three di erent locations, with a spatial sampling of 0: 028 using the Faint Object Camera f/48 spectrograph on board HST. These data allow us to determine the rotation curve of the inner 1 of the ionized gas disk in [O II] 3727 to a distance as close as 0: 07 (' 5pc) to the(More)
We summarize a study where we test the hypothesis that local black holes (BH) are relics of AGN activity. We compare the mass function of BHs in the local universe with that expected from AGN relics, which are BHs grown entirely with mass accretion during AGN phases. The local BH mass function (BHMF) is estimated by applying the well-known correlations(More)
Using the extended J, H and K magnitudes provided by the 2MASS data archive, we consider the position of brightest cluster galaxies (BCGs) in the observed relations between inferred supermassive black hole (SMBH) mass and the host galaxy properties, as well as their position in the stellar velocity dispersion and luminosity (σ∗ − L) relation, compared to E(More)
The young stellar object MWC 297 is an embedded B1.5Ve star exhibiting strong hydrogen emission lines and a strong near-infrared continuum excess. This object has been observed with the VLT interferometer equipped with the AMBER instrument during its first commissioning run. VLTI/AMBER is currently the only near infrared interferometer which can observe(More)
We present initial 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 spectroscopy. Gas metallicities are measured, for an initial sample of nine star forming galaxies at z∼3.5, by means of optical nebular lines redshifted into the near-IR. Stellar masses are(More)
Infrared observations of Si IX], S IX] Si VII], Si VI], and Ca VIII] coronal line emission in NGC1068 are presented and discussed together with visible spectra covering Fe VII], Fe X], Fe XI] and S VIII]. These lines are found to peak ' 50 pc NE of the nucleus and appear to arise predominantly in outtowing gas within the prominent ionization cone aligned(More)
Context. Interferometry can provide spatially resolved observations of massive star binary systems and their colliding winds, which thus far have been studied mostly by means of spatially unresolved observations. Aims. In this work, we present the first AMBER/VLTI observations, taken at orbital phase 0.32, of the Wolf-Rayet and O (WR+O) star binary system γ(More)
We report on the first detection above∼10 keV of the archetypal Compton–thick Seyfert 2 galaxy NGC 1068. This detection, obtained with the PDS instrument onboard BeppoSAX in the 20–100 keV range, confirms the hardness of the X–ray spectrum above a few keV (as indicated by ASCA observations) and supports models envisaging a mixture of both neutral and(More)