Jul 12 – 23, 2021
Europe/Berlin timezone

Building a robust sample of Fermi-LAT blazars that exhibit periodic gamma-ray emission

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


Talk GAD | Gamma Ray Direct Discussion


Pablo Peñil (Clemson University)


Blazars can show variability on a wide range of timescales. However, the search for periodicity in the gamma-ray emission of blazars remains an on-going challenge. This contribution will show the results obtained when a systematic pipeline is used to implement ten well-established methods for searching for periodicity. We analyze the most promising candidates selected from our previous work, extending the Fermi-LAT light curves over three more years, for a total telescope time of twelve years. These improvements have allowed us to build the first sample of blazars that display a periodicity detected at a significance >5sigma. Finally, we will discuss the potential origins for the periodic behavior observed in blazars.


AGN; Fermi-LAT; periodicity, 5sigma, systematic search

Collaboration Ferrmi-LAT
Subcategory Experimental Results

Primary authors

Pablo Peñil (Clemson University) Dr Alberto Dominguez (Universidad Complutense) Dr Marco Ajello (Clemson University) Dr Sara Buson on behalf of the Fermi-LAT collaboration (Universität Würzburg)

Presentation materials