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Book synopsis

20 years after the discovery of the Crab Nebula as a source of very high energy (VHE) gamma-rays, the number of sources discovered 100 GeV using Cherenkov telescopes has quickly grown to almost 100. This book focuses on the search for emission from a particular type of blazars previously undetected at VHE gamma-rays: low-peaked (LBL) and intermediate-peaked (IBL) BL Lacertae objects. These sources emit non-thermal radiation, and exhibit a peak in their radio-to-X-ray spectral energy distribution at UV/IR energies. They dominate source counts from space-borne observations at gamma-ray energies 10 GeV, with spectra that show power-law extensions to higher energies, though theoretical models suggest a turn over at energies 100 GeV. The search was narrowed to the prominent sources BL Lac, W-Comae and S5-0716. Their detections are in line with theoretical expectations, but strain models based on electron shock acceleration and Inverse- Compton cooling. Short variability time scales around one day observed at VHE show that the gamma- rays originate close to the putative supermassive black holes in the centers of blazars, corresponding to 1000 Schwarzschild radii.

Book details

Book category Books in German Naturwissenschaften, Medizin, Informatik, Technik Physik, Astronomie

• Full title: Discovery of the first LBL/IBL Objects at Very High Energy Gamma-Rays
• Subtitle: Characterization of Low-Peaked (LBL) and Intermediate-Peaked (IBL) BL Lacertae Objects and Description of the Observation Technique
• Author: Karsten Berger
• Language: German
• Binding: Paperback
• Number of pages: 140
• EAN: 9783838110639
• ID: 06886830
• Publisher: Südwestdeutscher Verlag für Hochschulschriften
• Weight: 227 g
• Dimensions: 220 × 150 × 9 mm
• Published: 2009

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