In 2005 and 2006, the MAGIC telescope observed very high energy gamma-ray emission from the distant BL Lac object PG 1553 + 113. The overall significance of the signal was 8.8 sigma for 18.8 hr of observation time. The light curve shows no significant flux variations on a daily timescale; the flux level during 2005 was, however, significantly higher compared to 2006. The differential energy spectrum between similar to 90 and 500 GeV is well described by a power law with photon index. Gamma = 4.2 +/- 0.3. The combined 2005 and 2006 energy spectrum provides an upper limit of z = 0.74 on the redshift of the object.
Detection of very high energy radiation from the BL lacertae object PG 1553+113 with the MAGIC telescope
BASTIERI, DENIS;DAZZI, FRANCESCO;DORO, MICHELE;MARIOTTI, MOSE';PASCOLI, DONATELLA;PERUZZO, LUIGI;PRANDINI, ELISA;SAGGION, ANTONIO;SARTORI, PAOLO;SCALZOTTO, VILLI MARIO;
2007
Abstract
In 2005 and 2006, the MAGIC telescope observed very high energy gamma-ray emission from the distant BL Lac object PG 1553 + 113. The overall significance of the signal was 8.8 sigma for 18.8 hr of observation time. The light curve shows no significant flux variations on a daily timescale; the flux level during 2005 was, however, significantly higher compared to 2006. The differential energy spectrum between similar to 90 and 500 GeV is well described by a power law with photon index. Gamma = 4.2 +/- 0.3. The combined 2005 and 2006 energy spectrum provides an upper limit of z = 0.74 on the redshift of the object.File in questo prodotto:
| File | Dimensione | Formato | |
|---|---|---|---|
|
Albert_etal_2007_Detection of Very High Energy Radiation from the BL Lacertae Object PG 1553+113 with the MAGIC Telescope.pdf
accesso aperto
Tipologia:
Published (publisher's version)
Licenza:
Accesso libero
Dimensione
97.3 kB
Formato
Adobe PDF
|
97.3 kB | Adobe PDF | Visualizza/Apri |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
