Extreme photo-polarimetric behaviour of the blazar AO 0235+164 (2007)
Cellone, Sergio A., Romero, Gustavo E., Combi, Jorge A., Marti, Josep
We present optical photo-polarimetric observations with high temporal resolution of the blazar AO 0235+164. Our data, the first to test the photo-polarimetric behaviour of this object at very short...
TeV J2032+4130: a not-so-dark Accelerator? (2006)
Butt, Yousaf M., Combi, Jorge A., Drake, Jeremy, Finley, John P., Konopelko, Alexander, Lister, Matthew, ...
The HEGRA gamma-ray source TeV J2032+4130 is considered the prototypical 'dark accelerator', since it was the first TeV source detected with no firm counterparts at lower frequencies. The Whipple...
XMM detection of the supernova remnant G337.2+0.1 (2006)
Combi, Jorge A., Colombo, Juan F. Albacete, Romero, Gustavo E., Benaglia, Paula
We report the first XMM detection of the SNR candidate G337.2+0.1 (=AX J1635.9-4719). The object shows centrally filled and diffuse X-ray emission. The emission peaks in the hard 3.0-10.0 keV band. A...
Did Egret Detect Distant Supernova Remnants? (2003)
Torres, Diego F., Romero, Gustavo E., Dame, Thomas M., Combi, Jorge A., Butt, Yousaf M.
It might be thought that supernova remnants (SNRs) more distant than a few kiloparsec from Earth could not have been detected by the EGRET experiment. This work analyzes the observational status of...
Supernova remnants and gamma-ray sources (2002)
Torres, Diego F., Romero, Gustavo E., Dame, Thomas M., Combi, Jorge A., Butt, Yousaf M.
A review of the possible relationship between gamma-ray sources and supernova remnants (SNRs) is presented. Particular emphasis is given to the analysis of the observational status of the problem of...
Supernova-Remnant Origin of Cosmic Rays? (2002)
Butt, Yousaf M., Torres, Diego F., Romero, Gustavo E., Dame, Thomas M., Combi, Jorge A.
It is thought that Galactic cosmic ray (CR) nuclei are gradually accelerated to high energies (up to ~300 TeV/nucleon, where 1TeV=10^12eV) in the expanding shock-waves connected with the remnants of...
Molecular Beam Dumps as Tracers of Hadronic Cosmic Ray Sources: the Case of SNR IC443 (2002)
Butt, Yousaf M., Torres, Diego F., Combi, Jorge A., Dame, Thomas M., Romero, Gustavo E.
The gamma-ray & neutrino visibility of cosmic ray (CR) accelerators will be dramatically increased by the presence of molecular material abutting such sites due to the increased probability of pion...
Is the Supernova Remnant RX J1713.7-3946 a Hadronic Cosmic Ray Accelerator ? (2001)
Butt, Yousaf M., Torres, Diego F., Combi, Jorge A., Dame, Thomas, Romero, Gustavo E.
The non-thermal supernova remnant RX J1713.7-3946 (G347.3-0.5) has recently been shown to be a site of cosmic ray (CR) electron acceleration to TeV energies (Muraishi et al. 2000). Here we present...
Variable gamma-ray emission from the Be/X-ray transient A0535+26? (2001)
Romero, Gustavo E., Bernado, M. M. Kaufman, Combi, Jorge A., Torres, Diego F.
We present a study of the unidentified gamma-ray source 3EG J0542+2610. This source is spatially superposed to the supernova remnant G180.0-1.7, but its time variability makes unlikely a physical...
A Study of the Unidentified Gamma-Ray Source 3EG J1828+0142 (2001)
Combi, Jorge A., Romero, Gustavo E., Torres, Diego F., Punsly, Brian
We present a study of the radio environment of the gamma-ray source 3EG J1828+0142. This source presents a very high variability index in its gamma emission and a steep high-energy spectral index...
Detection of a new, low-brightness supernova remnant possibly associated with EGRET sources (2001)
Combi, Jorge A., Romero, Gustavo E., Benaglia, Paula, Jonas, Justin L.
We report on the discovery of a shell-type supernova remnant in the southern sky. It is a large (8*8), low-brightness source with a nonthermal radio spectrum, which requires background filtering to...
Positional correlation between low-latitude gamma-ray sources and SNRs (2000)
Torres, Diego F., Combi, Jorge A., Romero, Gustavo E., Benaglia, P.
We present the results of a spatial correlation analysis between unidentified gamma-ray sources in the 3EG catalog and candidates to supernova remnants. This work extends a previous study made by...