• Gamma-ray emitting narrow-line Seyfert 1 galaxies: Past, present, and future

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      https://www.ias.ac.in/article/fulltext/joaa/040/05/0039

    • Keywords

       

      galaxies: active; gamma rays: galaxies; galaxies: jets; galaxies: Seyfert; quasars: general.

    • Abstract

       

      This article reviews our current understanding about $\gamma$-ray detected narrow-line Seyfert 1 ($\gamma$ -NLSy1) galaxies. The detection with the Large Area Telescope onboard Fermi Gamma-ray Space Telescope has provided the strongest evidence for the presence of closely aligned relativistic jet in these intriguing active galactic nuclei (AGN) and opened up a realm to explore the physical conditions needed to launch the jet in a different central engine and host galaxy environment than that is known for blazars. Promising results acquired from various multi-wavelength campaigns are converging to a scenario in which the $\gamma$-NLSy1 galaxies can be considered as ‘young’ blazars. These enigmatic sources hold the key to unravel the jet triggering mechanism and evolution of the AGN phase of a galaxy, in general. As such, $\gamma$-NLSy1s should be considered as one of the top priority targets for next generation observational facilities.

    • Author Affiliations

       

      VAIDEHI S. PALIYA1

      1. Deutsches Elektronen Synchrotron DESY, Platanenallee 6, 15738 Zeuthen, Germany
    • Dates

       
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