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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
PSR J0357+3205: the tail of the turtle
Martino Marelli, Andrea De Luca, David Salvetti +6
Using a new XMM-Newton observation, we have characterized the X-ray properties of the middle-aged radio-quiet gamma-ray pulsar J0357+3205 (named Morla) and its tail. The X-ray emis…
PSR J0357+3205: a fast moving pulsar with a very unusual X-ray trail
A. De Luca, R. P. Mignani, M. Marelli +6
The middle-aged PSR J0357+3205 is a nearby, radio-quiet, bright gamma-ray pulsar discovered by the Fermi mission. Our previous Chandra observation revealed a huge, very peculiar st…
X-ray and radio observations of the magnetar Swift J1834.9-0846 and its dust-scattering halo
P. Esposito, A. Tiengo, N. Rea +13
We present a long-term study of the 2011 outburst of the magnetar Swift J1834.9-0846 carried out using new Chandra observations, as well as all the available Swift, RXTE, and XMM-N…
Chandra, Keck and VLA Observations of the Crab Nebula during the 2011-April Gamma-ray Flare
Martin C. Weisskopf, Allyn F. Tennant, Roger Blandford +21
We present results from our analysis of Chandra X-ray Observatory, W. M. Keck Observatory, and Karl G. Jansky Very Large Array (VLA) images of the Crab Nebula that were contemporan…
New VLT observations of the Fermi pulsar PSR J1048-5832
M. Razzano, R. P. Mignani, M. Marelli +1
PSR J1048-5832 is a Vela-like (P=123.6 ms; tau~20.3 kyr) gamma-ray pulsar detected by Fermi, at a distance of ~2.7 kpc and with a rotational energy loss rate dot{E}_{SD} ~2 x 10^{3…
Long-term Monitoring on Mrk 501 for Its VHE gamma Emission and a Flare in October 2011
YBJ Collaboration, B. Bartoli, P. Bernardini +101
As one of the brightest active blazars in both X-ray and very high energy -ray bands, Mrk 501 is very useful for physics associated with jets from AGNs. The ARGO-YBJ experiment…
Observation of the TeV gamma-ray source MGRO J1908+06 with ARGO-YBJ
YBJ Collaboration
The extended gamma ray source MGRO J1908+06, discovered by the Milagro air shower detector in 2007, has been observed for about 4 years by the ARGO-YBJ experiment at TeV energies,…
Importance of axion-like particles for very-high-energy astrophysics
Marco Roncadelli, Alessandro De Angelis, Giorgio Galanti
Several extensions of the Standard Model predict the existence of Axion-Like Particles (ALPs), very light spin-zero bosons with a two-photon coupling. ALPs can give rise to observa…
The AGILE monitoring of Cygnus X-3: transient gamma-ray emission and spectral constraints
G. Piano, M. Tavani, V. Vittorini +34
We present the AGILE-GRID monitoring of Cygnus X-3, during the period between November 2007 and July 2009. We report here the whole AGILE-GRID monitoring of Cygnus X-3 in the AGILE…
Hardening of TeV gamma spectrum of AGNs in galaxy clusters by conversions of photons into axion-like particles
Dieter Horns, Luca Maccione, Manuel Meyer +3
A fraction of AGN producing VHE gamma-rays are located in galaxy clusters. The magnetic field present in the intra-cluster medium would lead to conversions of VHE photons into axio…
Optical and X-ray observations of candidate isolated neutron stars in the G315.4-2.3 SNR
R. P. Mignani, A. Tiengo, A. De Luca
G315.4-2.3 is a young Galactic supernova remnant (SNR), whose identification as the remains of a Type-II supernova (SN) explosion has been debated for a long time. In particular, r…
The characterization of the distant blazar GB6 J1239+0443 from flaring and low activity periods
L. Pacciani, I. Donnarumma, K. D. Denney +64
In 2008 AGILE and Fermi detected gamma-ray flaring activity from the unidentified EGRET source 3EG J1236+0457, recently associated with a flat spectrum radio quasar GB6 J1239+0443…
VLT Suzaku observations of the Fermi pulsar PSR J1028-5819
R. P. Mignani, M. Razzano, P. Esposito +4
We used optical images taken with the Very Large Telescope (VLT) in the B and V bands to search for the optical counterpart of PSR J1028-5819 or constrain its optical brightness. A…
The near-infrared detection of PSR B0540-69 and its nebula
R. P. MignanI, A. De Luca, W. Hummel +4
The ~1700 year old PSR B0540-69 in the LMC is considered the twin of the Crab pulsar because of its similar spin parameters, magnetic field, and energetics. Its optical spectrum is…
Probing axion-like particles with the ultraviolet photon polarization from active galactic nuclei in radio galaxies
D. Horns, L. Maccione, A. Mirizzi +1
The mixing of photons with axion-like particles (ALPs) in the large-scale magnetic field changes the polarization angle of a linearly polarized photon beam from active galactic…
Spectral monitoring of RX J1856.5-3754 with XMM-Newton. Analysis of EPIC-pn data
N. Sartore, A. Tiengo, S. Mereghetti +3
Using a large set of XMM-Newton observations we searched for long term spectral and flux variability of the isolated neutron star RX J1856.5-3754 in the time interval from April 20…
Galactic Sources Science With Agile: The Case Of The Carina Region
S. Sabatini, M. Tavani, E. Pian +63
During its first 2 years of operation, the gamma-ray AGILE satellite accumulated an extensive dataset for the Galactic plane. The data have been monitored for transient sources and…
Evidence for an axion-like particle from PKS 1222+216?
F. Tavecchio, M. Roncadelli, G. Galanti +1
The surprising discovery by MAGIC of an intense, rapidly varying emission in the energy range 70 - 400 GeV from the flat spectrum radio quasar PKS 1222+216 represents a challenge f…
Measurement of the cosmic ray antiproton/proton flux ratio at TeV energies with the ARGO-YBJ detector
YBJ Collaboration
Cosmic ray antiprotons provide an important probe to study the cosmic ray propagation in the interstellar space and to investigate the existence of dark matter. Acting the Earth-Mo…
Observation of TeV gamma rays from the Cygnus region with the ARGO-YBJ experiment
B. Bartoli, P. Bernardini, X. J. Bi +100
We report the observation of TeV gamma-rays from the Cygnus region using the ARGO-YBJ data collected from 2007 November to 2011 August. Several TeV sources are located in this regi…