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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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20 papers · 2 filters
X-ray pulsations from the radio-quiet gamma-ray pulsar in CTA 1
P. A. Caraveo, A. De Luca, M. Marelli +4
Prompted by the Fermi LAT discovery of a radio-quiet gamma-ray pulsar inside the CTA 1 supernova remnant, we obtained a 130 ks XMM-Newton observation to assess the timing behavior…
Two years of monitoring Supergiant Fast X-ray Transients with Swift
P. Romano, V. La Parola, S. Vercellone +10
We present two years of intense Swift monitoring of three SFXTs, IGR J16479-4514, XTE J1739-302, and IGR J17544-2619 (since October 2007). Out-of-outburst intensity-based X-ray (0.…
Study of the gamma-ray source 1AGL J2022+4032 in the Cygnus Region
A. W. Chen, G. Piano, M. Tavani +58
Identification of gamma-ray-emitting Galactic sources is a long-standing problem in astrophysics. One such source, 1AGL J2022+4032, coincident with the interior of the radio shell…
Discovery of 59ms Pulsations from 1RXS J141256.0+792204 (Calvera)
S. Zane, F. Haberl, G. L. Israel +10
We report on a multi-wavelength study of the compact object candidate 1RXS J141256.0+792204 (Calvera). Calvera was observed in the X-rays with XMM/EPIC twice for a total exposure t…
Agile Observations of the "Soft" Gamma-Ray Pulsar PSR B1509-58
M. Pilia, A. Pellizzoni, A. Trois +60
We present the results of new Agile observations of PSR B1509-58 performed over a period of 2.5 years following the detection obtained with a subset of the present data. The modula…
HST and VLT observations of the neutron star 1E 1207.4-5209
A. De Luca, R. P. Mignani, A. Sartori +4
1E 1207.4-5209, the peculiar Central Compact object in the G296.5+10.0 supernova remnant, has been proposed to be an "anti-magnetar" - a young neutron star born with a weak dipole…
The 2008 October Swift detection of X-ray bursts/outburst from the transient SGR-like AXP 1E 1547.0-5408
G. L. Israel, P. Esposito, N. Rea +17
We report on the detailed study of the 2008 October outburst from the anomalous X-ray pulsar (AXP) 1E 1547.0-5408 discovered through the Swift/Burst Alert Telescope (BAT) detection…
AGILE detection of GeV gamma-ray emission from the SNR W28
A. Giuliani, M. Tavani, A. Bulgarelli +59
Supernova remnants (SNRs) are believed to be the main sources of Galactic cosmic rays. Molecular clouds associated with SNRs can produce gamma-ray emission through the interaction…
A year-long AGILE observation of Cygnus X-1 in hard spectral state
E. Del Monte, M. Feroci, Y. Evangelista +52
We present the observation of Cyg X-1 in hard spectral state performed during the AGILE Science Verification Phase and Observing Cycle 1 in hard X-rays (with SuperAGILE) and gamma…
An ultra-massive fast-spinning white dwarf in a peculiar binary system
S. Mereghetti, A. Tiengo, P. Esposito +3
White dwarfs typically have masses in a narrow range centered at about 0.6 solar masses (Msun). Only a few ultra-massive white dwarfs (M>1.2 Msun) are known. Those in binary system…
Episodic Transient Gamma-Ray Emission from the Microquasar Cygnus X-1
S. Sabatini, M. Tavani, E. Striani +58
Cygnus X-1 is the archetypal black hole (BH) binary system in our Galaxy. We report the main results of an extensive search for transient gamma-ray emission from Cygnus X-1 carried…
Gamma ray flares from Mrk421 in 2008 observed with the ARGO-YBJ detector
G. Aielli et al.
In 2008 the blazar Markarian 421 entered a very active phase and was one of the brightest sources in the sky at TeV energies, showing frequent flaring episodes. Using the data of A…
Have Cherenkov telescopes detected a new light boson?
Marco Roncadelli, Alessandro De Angelis, Oriana Mansutti
Recent observations by H.E.S.S. and MAGIC strongly suggest that the Universe is more transparent to very-high-energy gamma rays than previously thought. We show that this fact can…
Early X-ray and optical observations of the soft gamma-ray repeater SGR 0418+5729
P. Esposito, G. L. Israel, R. Turolla +13
Emission of two short hard X-ray bursts on 2009 June 5 disclosed the existence of a new soft gamma-ray repeater, now catalogued as SGR 0418+5729. After a few days, X-ray pulsations…
Multiwavelength observations of 3C 454.3. III. Eighteen months of AGILE monitoring of the "Crazy Diamond"
S. Vercellone, F. D'Ammando, V. Vittorini +110
We report on 18 months of multiwavelength observations of the blazar 3C 454.3 (Crazy Diamond) carried out in July 2007-January 2009. We show the results of the AGILE campaigns whic…
Direct Evidence for Hadronic Cosmic-Ray Acceleration in the Supernova Renmant IC 443
M. Tavani, A. Giuliani, A. W. Chen +59
The Supernova Remnant (SNR) IC 443 is an intermediate-age remnant well known for its radio, optical, X-ray and gamma-ray energy emissions. In this Letter we study the gamma-ray emi…
Multi-wavelength observations of 1RXH J173523.7-354013: revealing an unusual bursting neutron star
N. Degenaar, P. G. Jonker, M. A. P. Torres +14
On 2008 May 14, the Burst Alert Telescope aboard the Swift mission triggered on a type-I X-ray burst from the previously unclassified ROSAT object 1RXH J173523.7-354013, establishi…
The spectacular X-ray echo of a magnetar burst
A. Tiengo, G. Vianello, P. Esposito +1
The Anomalous X-ray Pulsar (AXP) 1E 1547.0-5408 reactivated in 2009 January with the emission of dozens of short bursts. Follow-up observations with Swift/XRT and XMM-Newton showed…
Axion-like particle effects on the polarization of cosmic high-energy gamma sources
Nicola Bassan, Alessandro Mirizzi, Marco Roncadelli
Various satellite-borne missions are being planned whose goal is to measure the polarization of a large number of gamma-ray bursts (GRBs). We show that the polarization pattern pre…
Detection of Gamma-Ray Emission from the Vela Pulsar Wind Nebula with AGILE
A. Pellizzoni, A. Trois, M. Tavani +68
Pulsars are known to power winds of relativistic particles that can produce bright nebulae by interacting with the surrounding medium. These pulsar wind nebulae (PWNe) are observed…