Volume 616, August 2018
|Number of page(s)||6|
|Published online||13 August 2018|
Study of the orientation of narrow-line Seyfert I
Dipartimento di Fisica G. Occhialini,
Università degli Studi di Milano Bicocca,
Piazza della Scienza 3,
2 INFN, Sezione Milano-Bicocca, Piazza della Scienza 3, 20126 Milano, Italy
3 INAF – Osservatorio Astronomico di Brera, Merate, via E. Bianchi 46, 23807 Merate, Italy
Accepted: 7 May 2018
We study a sample of narrow-line Seyfert 1 galaxies (NLS1) in their optical and radio features to understand the differences between their radio silent, radio-loud, and radio-quiet subclasses. We first show that the different redshift and mass distributions of radio-loud and radio-quiet NLS1s could be ascribed to observational biases. We then present a geometrical model according to which most of the different observational features of radio-loud and radio-quiet NLS1s are ascribed to the orientation of an intrinsically structured jet. We estimate the fraction of intrinsically jetted sources among NLS1s that justifies the observed radio-detected population. Noticeably, under the assumptions of the geometrical model, we derive a fraction of jetted sources significantly larger than in standard AGN.
Key words: galaxies: active / galaxies: Seyfert / galaxies: jets / black hole physics
© ESO 2018
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.