Publications (18)
On the use of asymmetric PSF on NIR images of crowded stellar fields
Giuliana Fiorentino, Ivan Ferraro, Giacinto Iannicola +8
We present data collected using the camera PISCES coupled with the Firt Light Adaptive Optics (FLAO) mounted at the Large Binocular Telescope (LBT). The images were collected using…
Using Globular Clusters to Test Newton?s Law of Gravityy
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi
New measurements of the velocity dispersion of the globular cluster omega Centauri allow to trace its gravitational potential down to an acceleration of 8e-9 cm/s/s. It is found th…
The distance to NGC1316 (Fornax A): yet another curious case
Michele Cantiello, Aniello Grado, John P. Blakeslee +6
The distance of NGC1316, the brightest galaxy in Fornax, is an interesting test for the cosmological distance scale. First, because Fornax is the 2nd largest cluster of galaxies at…
Globular Clusters as a Test for Gravity in the Weak Acceleration Regime
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi
Non-baryonic Dark Matter (DM) appears in galaxies and other cosmic structures when and only when the acceleration of gravity, as computed considering only baryons, goes below a wel…
Using globular clusters to test gravity in the weak acceleration regime
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi
We have carried out a study of the velocity dispersion of the stars in the outskirts of the globular cluster Omega Centauri, finding that the velocity dispersion remains constant a…
Rebirth of Novae as Distance Indicators Due to Efficient Large Telescopes
Massimo Della Valle, Roberto Gilmozzi
Nova outbursts are the result of strong thermonuclear runaways on the surface of a white dwarf accreting Hydrogen-rich material from a small mass companion. These giant explosions…
TTauri Stars in the Large Magellanic Cloud: a combined HST and VLT effort
Martino Romaniello, Nino Panagia, Salvatore Scuderi +4
The combination of the unprecedented spatial resolution attainable with WFPC2 on board HST and of the large collecting area of the VLT makes it possible to study in detail the low…
Using globular clusters to test gravity in the weak acceleration regime: NGC 6171
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi
As part of an ongoing program to test Newton's law of gravity in the low acceleration regime using globular clusters, we present here new results obtained for NGC 6171. Combining V…
No quantum gravity signature from the farthest quasars
Fabrizio Tamburini, Carmine Cuofano, Massimo Della Valle +1
Context: Strings and other alternative theories describing the quantum properties of space-time suggest that space-time could present a foamy structure and also that, in certain ca…
VLT-FORS1 Imaging Polarimetry of M83 (NGC 5236) - I. Search for Light Echoes from Historical Supernovae
Martino Romaniello, Ferdinando Patat, Nino Panagia +3
We have used FORS1 at the ESO VLT to search for light echoes in imaging polarimetry from four historical supernovae in the face-on nearby spiral galaxy M83 (NGC 5236). No echoes we…
Using globular clusters to test gravity in the weak acceleration regime
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi +1
We report on the results from an ongoing program aimed at testing Newton's law of gravity in the low acceleration regime using globular clusters. It is shown that all clusters stud…
Using globular clusters to test gravity in the weak acceleration regime: NGC 7099
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi +1
A test of Newton's law of gravity in the low acceleration regime using globular clusters is presented. New results for the core collapsed globular cluster NGC 7099 are given. The r…
A Test of Newton's Law of Gravity in the Weak Acceleration Regime
Riccardo Scarpa, Gianni Marconi, Roberto Gilmozzi
A pilot experiment suitable to test Newton's law of gravity down to the regime of acceleration typical of galaxies has been carried out in Omega Centauri. Stars in the extreme peri…
The secrets of T Pyx: I. UV observations
Roberto Gilmozzi, Pierluigi Selvelli
We have studied the UV spectral behavior of the recurrent nova T Pyx during 16 years of IUE observations. We examined both the IUE line-by-line images and the extracted spectra in…
The White Dwarf Distance to the Globular Cluster NGC 6752 (and its Age) with the Hubble Space Telescope (Based on observations made with the NASA/ESA Hubble Space Telescope (HST))
Alvio Renzini, Angela Bragaglia, Francesco R. Ferraro +6
Deep Hubble Space Telescope (HST) observations with WFPC2 of the nearby globular cluster NGC 6752 have allowed us to obtain accurate photometry for the cluster white dwarfs (WD). A…
A UV and optical study of 18 old novae with Gaia DR2 distances: mass accretion rates, physical parameters, and MMRD
Pierluigi Selvelli, Roberto Gilmozzi
{We combine the results of our earlier study of the UV characteristics of 18 classical novae (CNe) with data from the literature and with the recent precise distance determinations…
High resolution spectroscopy of the line emission from the inner circumstellar ring of SN 1987A and its hot spots
Per Groeningsson, Claes Fransson, Peter Lundqvist +8
We discuss high resolution VLT/UVES observations (FWHM ~ 6 km/s) from October 2002 (day ~5700 past explosion) of the shock interaction of SN 1987A and its circumstellar ring. A neb…
The metamorphosis of Supernova SN2008D/XRF080109: a link between Supernovae and GRBs/Hypernovae
Paolo A. Mazzali, Stefano Valenti, Massimo Della Valle +38
The only supernovae (SNe) to have shown early gamma-ray or X-ray emission thus far are overenergetic, broad-lined Type Ic SNe (Hypernovae - HNe). Recently, SN 2008D shows several n…