Radio Galaxy Zoo Talk

Radio jets and gamma-ray emission in Radio-Silent narrow-line Seyfert 1 galaxies

  • zutopian by zutopian

    Following paper was submitted to arxiv some months ago.:

    Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1 galaxies

    We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37 GHz that were previously classified as radio silent and two that were classified as radio quiet. These detections reveal the presumption that NLS1 galaxies labelled radio quiet or radio silent and hosted by spiral galaxies are unable to launch jets to be incorrect. The detections are a plausible indicator of the presence of a powerful, most likely relativistic jet because this intensity of emission at 37 GHz cannot be explained by, for example, radiation from supernova remnants. Additionally, one of the detected NLS1 galaxies is a newly discovered source of gamma rays and three others are candidates for future detections.

    A. Lähteenmäki, E. Järvelä, V. Ramakrishnan, M. Tornikoski, J. Tammi, R.J.C. Vera, W. Chamani
    (Submitted on 6 Jun 2018)
    https://arxiv.org/abs/1806.02058

    The paper is published as "free access" in the journal "Astronomy & Astrophysics".:
    https://www.aanda.org/articles/aa/abs/2018/06/aa33378-18/aa33378-18.html

    Posted

  • zutopian by zutopian

    Statemement taken from the paper.:

    Host galaxy information of NLS1 sources is rare and available only for three of our sources. Of these, J151020.06+ 554722.0 is a spiral galaxy and J123220.11+495721.8 possibly a spiral. J152205.41+393441.3 is an interacting system of two galaxies in which the NLS1 source is a spiral galaxy and the companion an unidentified, non-active galaxy; the two galaxies are located at identical redshifts (Järvelä et al. 2018).

    https://www.aanda.org/articles/aa/abs/2018/06/aa33378-18/aa33378-18.html

    PS: These galaxies are availabe in SDSS.

    Posted

  • zutopian by zutopian in response to zutopian's comment.

    In the statement from the paper (above post) there is given a Reference.:
    I assume, that it is following paper.:

    Near-infrared morphologies of the host galaxies of narrow-line Seyfert 1 galaxies

    (...) Our results suggest that spiral galaxies with pseudo-bulges are able to launch and maintain powerful jets.(...)

    Emilia Järvelä, Anne Lähteenmäki, Marco Berton
    (Submitted on 9 Jul 2018)
    https://arxiv.org/abs/1807.02970

    PS: The 1st author is listed as a co-author in the other paper.

    Posted

  • ivywong by ivywong scientist, admin

    Hmm yes, radio quiet galaxies are interesting in this era when telescopes and surveys get more and more sensitive

    Posted