Add to ORKGThe active galaxy BL Lac is the prototype of the so-called BL Lac objects. All AGN detected in the TeV energy range so far belong to this class of objects. BL Lac has been observed by the HEGRA system of imaging Cherenkov Telescopes for a total time of 10.5 hours from September to November 2000. We compare the results of these observations with X-ray data from the All Sky Monitor aboard the RXTE satellite and present an upper limit on the #-flux for energies above 0.7 TeV
Context. The study of BL Lac objects (BLL) detected in gamma-rays gives insights on the acceleration...
13 pages, 6 figures. Version 2: some rewording in the introduction, results and conclusions unchange...
. Observational and theoretical results indicate that low-redshift BL Lacertae objects are the most ...
A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic s...
A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic s...
A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic s...
The nearby BL Lac Object 1ES1959+650 (z = 0.047) has been observed with the HEGRA System of imaging ...
BL Lac objects are the most numerous class of extragalactic TeV-detected sources. One of the biggest...
The HEGRA system of five Imaging Atmospheric Cherenkov Telescopes (IACTs) has been used in 2000 and ...
Active galactic nuclei (AGN) are some of the most energetic objects in the Universe. They are compos...
The HEGRA system of Imaging Atmospheric Cherenkov Telescopes (IACTs) has been used since the beginni...
The low-frequency peaked BL Lac (LBL) object BL Lacertae was observed with the MAGIC telescope from ...
The BL Lac object 1ES1959+650 has been observed by the HEGRA Collaboration in the years 2000, 2001 a...
Since about 2002 the current-generation imaging air Cherenkov telescopes have discovered more than 5...
Context. The study of BL Lac objects (BLL) detected in gamma-rays gives insights on the acceleration...
Context. The study of BL Lac objects (BLL) detected in gamma-rays gives insights on the acceleration...
13 pages, 6 figures. Version 2: some rewording in the introduction, results and conclusions unchange...
. Observational and theoretical results indicate that low-redshift BL Lacertae objects are the most ...
A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic s...
A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic s...
A sample of 54 selected Active Galactic Nuclei (AGN) has been observed with the HEGRA stereoscopic s...
The nearby BL Lac Object 1ES1959+650 (z = 0.047) has been observed with the HEGRA System of imaging ...
BL Lac objects are the most numerous class of extragalactic TeV-detected sources. One of the biggest...
The HEGRA system of five Imaging Atmospheric Cherenkov Telescopes (IACTs) has been used in 2000 and ...
Active galactic nuclei (AGN) are some of the most energetic objects in the Universe. They are compos...
The HEGRA system of Imaging Atmospheric Cherenkov Telescopes (IACTs) has been used since the beginni...
The low-frequency peaked BL Lac (LBL) object BL Lacertae was observed with the MAGIC telescope from ...
The BL Lac object 1ES1959+650 has been observed by the HEGRA Collaboration in the years 2000, 2001 a...
Since about 2002 the current-generation imaging air Cherenkov telescopes have discovered more than 5...
Context. The study of BL Lac objects (BLL) detected in gamma-rays gives insights on the acceleration...
Context. The study of BL Lac objects (BLL) detected in gamma-rays gives insights on the acceleration...
13 pages, 6 figures. Version 2: some rewording in the introduction, results and conclusions unchange...
. Observational and theoretical results indicate that low-redshift BL Lacertae objects are the most ...