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Astrophys. Space Sci. Trans., 7, 65-68, 2011
www.astrophys-space-sci-trans.net/7/65/2011/ doi:10.5194/astra-7-65-2011 © Author(s) 2011. This work is distributed under the Creative Commons Attribution 3.0 License. |
09 Feb 2011
IFSI-INAF Corso Fiume 4, 10133 Torino, Italy
Mrk421 has been detected by ARGO-YBJ with a statistical significance of ~11 standard deviations. The observed TeV emission was highly variable, showing large enhancements of the flux during active periods. The study of the spectral behaviour during flares revealed a positive correlation of the hardness with the flux, as already reported in the past by the Whipple telescope, suggesting that this is a long term property of the source.
ARGO-YBJ observed a strong correlation between TeV gamma rays and the X-ray flux measured by RXTM/ASM and SWIFT/BAT during the whole period, with a time lag compatible with zero, supporting the one-zone SSC model to describe the emission mechanism.
MGROJ1908+06 has been detected by ARGO-YBJ with ~5 standard deviation of significance. From our data the source appears extended and the measured extension is
| σext = 0.48° | +0.26 |
| −0.28 |
Citation: S. Vernetto on behalf of the ARGO-YBJ collaboration: Gamma ray sources observation with the ARGO-YBJ detector, Astrophys. Space Sci. Trans., 7, 65-68, doi:10.5194/astra-7-65-2011, 2011.