English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The MAGIC collaboration observed BL Lacertae for 22.2 hr during 2005 Augustto December and for 26 hr during 2006 July to September. The source is thehistorical prototype and eponym of a class of low-frequency peaked BL Lacertae(LBL) objects. A very high energy (VHE) gamma-ray signal was discovered with a5.1 sigma excess in the 2005 data. Above 200 GeV, an integral flux of 0.6+-0.2x 10^(-11) cm^(-2) s^(-1) was measured, corresponding to approximately 3% ofthe Crab flux. The differential spectrum between 150 and 900 GeV is rathersteep with a photon index of -3.6+-0.5. The light curve shows no significantvariability during the observations in 2005. For the first time a cleardetection of VHE gamma-ray emission from an LBL object was obtained with asignal below previous upper limits. The 2006 data show no significant excess.This drop in flux follows the observed trend in optical activity.Comment: Accepted for publication in ApJ Letters, 4 pages, 5 figures, Figure-5  revised, Minor corrections following the referee repor

Discovery of Very High Energy γ-Ray Emission from the Low-Frequency-peaked BL Lacertae Object BL Lacertae