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18 papers · 2 filters
A time-variable, phase-dependent emission line in the X-ray spectrum of the isolated neutron star RX J0822-4300
A. De Luca, D. Salvetti, A. Sartori +9
RX J0822-4300 is the Central Compact Object associated with the Puppis A supernova remnant. Previous X-ray observations suggested RX J0822-4300 to be a young neutron star with a we…
The flaring blazars of the first 1.5 years of the AGILE mission
L. Pacciani, A. Bulgarelli, A. W. Chen +60
We report the AGILE gamma-ray observations and the results of the multiwavelength campaigns on seven flaring blazars detected by the mission: During two multiwavelength campaigns,…
The observation of Gamma Ray Bursts and Terrestrial Gamma-ray Flashes with AGILE
E. Del Monte, G. Barbiellini, F. Fuschino +50
Since its early phases of operation, the AGILE mission is successfully observing Gamma Ray Bursts (GRBs) in the hard X-ray band with the SuperAGILE imager and in the MeV range with…
AGILE detection of Cygnus X-3 γ-ray active states during the period mid-2009/mid-2010
A. Bulgarelli, M. Tavani, A. W. Chen +70
Cygnus X-3 (Cyg X-3) is a well-known microquasar producing variable emission at all wavelengths. Cyg X-3 is a prominent X-ray binary producing relativistic jets, and studying its h…
Neutral pion emission from accelerated protons in the supernova remnant W44
A. Giuliani, M. Cardillo, M. Tavani +41
We present the AGILE gamma-ray observations in the energy range 50 MeV - 10 GeV of the supernova remnant (SNR) W44, one of the most interesting systems for studying cosmic-ray prod…
The AGILE observations of the hard and bright GRB 100724B
E. Del Monte, G. Barbiellini, I. Donnarumma +49
The observation of Gamma Ray Bursts (GRBs) in the gamma-ray band has been advanced by the AGILE and Fermi satellites after the era of the Compton Gamma-Ray Observatory. AGILE and F…
The Identification of the X-ray Counterpart to PSR J2021+4026
Martin C. Weisskopf, Roger W. Romani, Massimiliano Razzano +16
We report the probable identification of the X-ray counterpart to the gamma-ray pulsar PSR J2021+4026 using imaging with the Chandra X-ray Observatory ACIS and timing analysis with…
VLT observations of the two Fermi pulsars PSR J1357-6429 and PSR J1048-5832
R. P. Mignani, A. Shearer, A. De Luca +3
Optical observations of pulsars are crucial to study the neutron star properties, from the structure and composition of the interior, to the properties and geometry of the magnetos…
Observation of the Cosmic Ray Moon shadowing effect with ARGO-YBJ
YBJ Collaboration
Cosmic rays are hampered by the Moon and a deficit in its direction is expected (the so-called \emph{Moon shadow}). The Moon shadow is an important tool to determine the performanc…
The brightest gamma-ray flaring blazar in the sky: AGILE and multi-wavelength observations of 3C 454.3 during November 2010
S. Vercellone, E. Striani, V. Vittorini +84
Since 2005, the blazar 3C 454.3 has shown remarkable flaring activity at all frequencies, and during the last four years it has exhibited more than one gamma-ray flare per year, be…
The remarkable gamma-ray activity in the gravitationally lensed blazar PKS 1830-211
I. Donnarumma, A. De Rosa, V. Vittorini +34
We report the extraordinary gamma-ray activity (E>100 MeV) of the gravitationally lensed blazar PKS 1830-211 (z=2.507) detected by AGILE between October and November 2010. The sour…
Long-term monitoring of the TeV emission from Mrk 421 with the ARGO-YBJ experiment
YBJ Collaboration, B. Bartoli, P. Bernardini +105
ARGO-YBJ is an air shower detector array with a fully covered layer of resistive plate chambers. It is operated with a high duty cycle and a large field of view. It continuously mo…
The Crab Nebula super-flare in April 2011: extremely fast particle acceleration and gamma-ray emission
E. Striani, M. Tavani, G. Piano +47
We report on the extremely intense and fast gamma-ray are above 100 MeV detected by AGILE from the Crab Nebula in mid-April 2011. This event is the fourth of a sequence of reported…
Spectral Evolution of the September 2010 gamma-ray flare from the Crab Nebula (V2)
V. Vittorini, M. Tavani, G. Pucella +1
Strong gamma-ray flares from the Crab Nebula have been recently discovered by AGILE and confirmed by Fermi-LAT. We study here the spectral evolution in the gamma-ray energy range a…
AGILE detection of extreme gamma-ray activity from the blazar PKS 1510-089 during March 2009. Multifrequency analysis
F. D'Ammando, C. M. Raiteri, M. Villata +112
We report on the extreme gamma-ray activity from the FSRQ PKS 1510-089 observed by AGILE in March 2009. In the same period a radio-to-optical monitoring of the source was provided…
Discovery of a faint X-ray counterpart and of a parsec-long X-ray tail for the middle-aged, gamma-ray only pulsar PSR J0357+3205
A. De Luca, M. Marelli, R. P. Mignani +7
The Large Area Telescope (LAT) onboard the Fermi satellite opened a new era for pulsar astronomy, detecting gamma-ray pulsations from more than 60 pulsars, ~40% of which are not se…
X-ray and optical observations of the closest isolated radio pulsar
A. Tiengo, R. P. Mignani, A. De Luca +3
With a parallactic distance of 170 pc, PSR J2144-3933 is the closest isolated radio pulsar currently known. It is also the slowest (P = 8.51 s) and least energetic (Edot = 2.6E28 e…
Discovery of Powerful Gamma-Ray Flares from the Crab Nebula
M. Tavani, A. Bulgarelli, V. Vittorini +65
The well known Crab Nebula is at the center of the SN1054 supernova remnant. It consists of a rotationally-powered pulsar interacting with a surrounding nebula through a relativist…