A5019497849- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astronomy and Astrophysical Research
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Astronomical Observations and Instrumentation
- Stellar, planetary, and galactic studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Neutrino Physics Research
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Bladder and Urothelial Cancer Treatments
- Cancer Research and Treatments
- X-ray Spectroscopy and Fluorescence Analysis
- Scientific Research and Discoveries
- Advanced X-ray Imaging Techniques
- Particle accelerators and beam dynamics
- Virus-based gene therapy research
- Adaptive optics and wavefront sensing
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
Osservatorio di Astrofisica e Scienza dello Spazio
2018-2023
Harvard University
2023
Massachusetts General Hospital
2023
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2011-2022
National Institute for Astrophysics
2011-2021
Consejo Superior de Investigaciones Científicas
2016
Institute for Space Astrophysics and Planetology
1999-2016
Max Planck Institute for Extraterrestrial Physics
2016
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2016
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2016
We present the first catalog of active galactic nuclei (AGNs) detected by Large Area Telescope (LAT), corresponding to 11 months data collected in scientific operation mode. The First LAT AGN Catalog (1LAC) includes 671 γ-ray sources located at high Galactic latitudes (|b|>10°) that are with a test statistic greater than 25 and associated statistically AGNs. Some multiple AGNs, consequently, 709 comprising 300 BL Lacertae objects, 296 flat-spectrum radio quasars, 41 AGNs other types, 72...
Hard X-ray radiation has been detected for the first time in Coma cluster by BeppoSAX. Thanks to unprecedented sensitivity of Phoswich Detection System (PDS) instrument, source up ~80 keV. There is clear evidence (4.5 sigma) non-thermal emission excess thermal above ~25 The hard very unlikely due X Comae, Seyfert 1 galaxy present field view PDS. A spectral tail inverse Compton on CMB photons predicted clusters, like Coma, with radio halos. Combining results observations, a volume-averaged...
Analysis is presented for 15 months of data taken with the Large Area Telescope (LAT) on Fermi Gamma-ray Space 11 non-blazar active galactic nuclei (AGNs), including seven FRI radio galaxies and four FRII sources consisting two steep spectrum quasars. The broad line galaxy 3C 120 reported here as a γ-ray source first time. analysis based directional associations LAT in 3CR, 3CRR, MS4 (collectively referred to 3C-MS) catalogs. Seven eleven associated 3C-MS have spectral indices larger than...
We present γ-ray observations with the Large Area Telescope (LAT) on board Fermi Gamma-Ray Space of nearby radio galaxy Centaurus A (Cen A). The previous EGRET detection is confirmed, and localization improved using data from first 10 months science operation. In work, we presented lobes by LAT; in this concentrate core Cen A. Flux levels as seen LAT are not significantly different that found EGRET, nor extremely soft spectrum (Γ = 2.67 ± 0.10stat 0.08sys where photon flux Φ ∝ E−Γ)....
We present a detailed statistical analysis of the correlation between radio and gamma-ray emission Active Galactic Nuclei (AGN) detected by Fermi during its first year operation, with largest datasets ever used for this purpose. use both archival interferometric 8.4 GHz data (from VLA ATCA, full sample 599 sources) concurrent single-dish 15 measurements from Owens Valley Radio Observatory (OVRO, sub 199 objects). Our unprecedentedly large permits us to assess high accuracy significance...
We have used realistic Comptonization models to fit high-quality BeppoSAX data of six Seyfert galaxies. Our main effort was adopt a model taking into account the anisotropy soft photon field. The most important consequence is reduction first scattering order, which produces break (the so-called break) in outgoing spectra. Thus, anisotropic yield spectra with convex curvatures. physical parameters hot corona (i.e., temperature and optical depth) obtained by fitting this class broadband X-ray...
The Large Area Telescope (LAT) on the Fermi Gamma-ray Space is a pair-conversion telescope designed to detect photons with energies from 20 MeV > 300 GeV. pre-launch response functions of LAT were determined through extensive Monte Carlo simulations and beam tests. point-spread function (PSF) characterizing angular distribution reconstructed as energy geometry in detector here two years on-orbit data by examining distributions γrays pulsars active galactic nuclei (AGN). Above 3 GeV, PSF...
Mrk 421 was observed for about 2 days with BeppoSAX in 1998 April as part of a worldwide multiwavelength campaign. A large, well-defined flare X-rays. The same simultaneously at TeV energies by the Whipple Observatory gamma-ray telescope. These data provide (1) first evidence that X-ray and intensities are well correlated on timescales hours (2) exactly simultaneous spectra. results imply photons derive from region population relativistic electrons. physical parameters deduced homogeneous...
The gamma-ray blazar 3C 279 was monitored on a nearly daily basis with IUE, ROSAT and EGRET for three weeks between December 1992 January 1993. During this period, the at historical minimum all wavelengths. Here we present UV data obtained during above multiwavelength campaign. A maximum variation of ~50% is detected, while same period X-ray flux varied by no more than 13%. At lowest level average spectrum in 1230-2700 interval unusually flat object (~1). flattening could represent energy...
We report the hard X-ray spectrum of Coma cluster obtained using PDS data two independent BeppoSAX observations performed with a time interval about three years. In both spectra non thermal excess respect to emission is present at confidence level ~ 3.4 sigma. The combined by adding up allows measurement 4.8 sigma energies above 20 keV. analysis full set provides revised non-thermal flux which slightly lower than that previously estimated (Fusco-Femiano et al. 1999) and in agreement measured...
We present results from Chandra observations of the 3C/FR I sample low luminosity radio-galaxies. detected a power-law nuclear component in 12 objects out 18 with available data. In 4 galaxies we X-ray absorption at level 1022 cm-2. absorbed sources are associated presence highly inclined dusty disks (or dust filaments projected onto nuclei) seen HST images. This suggests existence flattened absorber, but much lower optical depth than classical obscuring tori. thus have an unobstructed view...
We report the first pointed X-ray observation, made by ASCA, of nearby Seyfert 2 galaxy in Circinus. The spectrum consists a very prominent (EW∼2 keV) fluorescent 6.4-keV iron line, flat continuum (photon spectral index less than 1) and other lines, including one at ∼7 keV that is probably due, least part, to K β emission. consistent with Compton scattering emission from cold matter illuminated an obscured active nucleus.
A long-term spectral variability study of 3C 273 on data obtained by BeppoSAX allows us to decouple the beamed nonthermal (jet) and unbeamed thermal (accretion flow) radiation produced in inner region a radio-loud active galactic nucleus. Jet power, when compared with radiation, increases energy. The component is generally overwhelmed factor 1.2 3 2- 10-keV range up 7 above 20 keV. In only one case, accretion flow overcomes jet, allowing K(alpha) iron line emerge clearly over continuum.
We report on a detailed investigation of the gamma-ray emission from 18 broad line radio galaxies (BLRGs) based two years Fermi Large Area Telescope (LAT) data. confirm previously reported detections 3C 120 and 111 in GeV photon energy range; look at temporal characteristics observed reveals addition possible flux variability both sources. No statistically significant detection other BLRGs was however found considered dataset. Though sample size studied is small, what appears to...
4597 Background: CG0070, is an Ad5-based oncolytic vaccine engineered to express GM-CSF and replicate selectively in tumor cells with mutated or deficient RB. The CG0070 mechanism of action includes cell lysis immunogenic death which enhanced the presence GM-CSF. In open label ph. 2 study, overall CR rate 62% a at 12 months (m) 29% have been observed patients high risk NMIBC previously treated BCG. IV pembrolizumab, was recently approved by FDA for BCG-unresponsive CIS (with without...
We present a new X-ray spectroscopic study of $22$ luminous ($2\times10^{45}\lesssim L_{\rm bol}\rm /erg\,s^{-1} \lesssim 2\times10^{46}$) active galactic nuclei (AGNs) at intermediate-redshift ($0.1 z 0.4$), as part the SUpermassive Black hole Winds in x-rAYS (SUBWAYS) sample, mostly composed quasars (QSOs) and type\,1 AGN. Here, 17 targets were observed with \textit{XMM-Newton} between 2019--2020 remaining 5 are from previous observations. The aim this large campaign ($1.45\,\rm Ms$...
In recent years, the jet formation region in active galaxies has been imaged through millimeter very long baseline interferometry (mm-VLBI) for a few ideal targets, particular, M,87. An important leap forward understanding launching could be taken by identifying larger number of suitable objects, characterized different accretion modes and powers. this article, we present 1,cm 7,mm VLBI data sample 16 poorly explored radio galaxies, comprising both high-excitation (HEGs) low-excitation...
After the positive detection by BeppoSAX of hard X-ray radiation up to approximately 80 keV in Coma Cluster spectrum, we present evidence for nonthermal emission from A2256 excess thermal at a 4.6 sigma confidence level. In addition this power-law component, second component already detected ASCA could be spectrum cluster, which is not surprising given complex radio morphology cluster central region. The spectral index tail Phoswich Detection System on board marginally consistent with that...
view Abstract Citations (152) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The 1993 Multiwavelength Campaign on 3C 279: Radio to Gamma-Ray Energy Distribution in Low State Maraschi, L. ; Grandi, P. Urry, C. M. Wehrle, A. E. Madejski, G. Fink, H. Ghisellini, Hartman, R. Koratkar, von Montigny, Pian, Thomas, Treves, Aller, F. D. Bailyn, Balonek, T. J. Bock, Collmar, W. Glass, I. S. Litchfield, McHardy, Mendez, Pesce, Reuter, Robson, Steppe,...
A systematic analysis of a large sample radio-loud active galactic nuclei (AGNs) available in the BeppoSAX public archive has been performed. The includes 3 narrow-line radio galaxies (NLRGs), 10 broad-line (BLRGs), 6 steep-spectrum quasars (SSRQs), and 16 flat-spectrum (FSRQs). According to unified models, these classes correspond objects with increasing viewing angles. As expected, presence nonthermal beamed component emerges clearly FSRQs. This class shows fact featureless continuum (with...
<i>Context. <i/>This paper presents the X-ray properties of a flux- and volume-limited complete sample 16 giga-hertz peaked spectrum (GPS) galaxies.<i>Aims. study addresses three basic questions in our understanding nature evolution GPS sources: a) What is physical origin emission galaxies? b) Which system associated with obscuration? c) "endpoint" compact radio sources?<i>Methods. <i/>We discuss this results spectral analysis, compare sources observables.<i>Results. obtain 100% (94%)...