Jul 12 – 23, 2021
Europe/Berlin timezone

Detection of new Extreme BL Lac objects with H.E.S.S. and SWIFT

Jul 13, 2021, 6:00 PM
1h 30m


Talk GAI | Gamma Ray Indirect Discussion


Ms Angel Priyana Noel (Astronomical Observatory of Jagiellonian University)


Extreme high synchrotron peaked blazars (EHBLs) are amongst the most powerful accelerators found in nature. Usually the synchrotron peak frequencyof an EHBL is above 10^17 Hz, i.e., lies in the range of medium to hard X-rays making them ideal sources to study particle acceleration and radiative processes. EHBL objects are commonly observed at energies beyond several TeV, making them powerful probes of gamma-ray absorption in the intergalactic medium. During the last decade, several attempts have been made to increase the number of EHBL detected at TeV energies and probe their spectral characteristics.
Here we report new detections of EHBLs in the TeV energy regime, each at a redshift of less than 0.25, by the High Energy Stereoscopic System (H.E.S.S.). Also, we report on X-ray observations of these EHBLs candidates with Swift XRT. In conjunction with the very high energy observations, this allows us to probe the radiation mechanisms and the underlying particle acceleration processes.

Subcategory Experimental Results
Collaboration H.E.S.S.

Primary authors

Ms Angel Priyana Noel (Astronomical Observatory of Jagiellonian University) Manuel Meyer (Erlangen Center for Astroparticle Physics) David Sanchez (CNRS/LAPP) Tomas Bylund Mr Mathieu de Bony de Lavergne (Laboratoire d’Annecy de Physique des Particules, Univ. Grenoble Alpes, Univ. Savoie MontBlanc, CNRS, LAPP,)

Presentation materials