Volume 328 - Revisiting narrow-line Seyfert 1 galaxies and their place in the Universe (NLS1-2018) - Jetted NLS1s
Kpc-scale radio-jets in narrow-line Seyfert 1 galaxies
V. Singh*, H. Chand, C.H. Ishwara-Chandra and P. Kharb
Full text: pdf
Pre-published on: July 13, 2018
Published on: December 21, 2018
Abstract
Narrow-Line Seyfert 1 galaxies (NLS1s) are generally believed to be radio-quiet Active Galactic Nuclei (AGN) with relatively less-massive (10$^{5}$$-$10$^{8}$~M$_{\odot}$) Super-Massive Black Holes (SMBH). Using the FIRST radio detections of hitherto the largest sample of 11101 optically-selected NLS1s we find a rather uncommon population of 55 NLS1s with Kiloparsec-Scale Radio structures (KSRs). We note that the number of NLS1s with KSRs found in our study is only a lower limit considering the effects of sensitivity, spatial resolution and projection, and hence, the number of NLS1s with KSRs may be more common than thought earlier. The NLS1s with KSRs are distributed across a wide range of redshifts, flux densities and luminosities. NLS1s with KSRs tend to exhibit steep radio spectra and are likely to be misaligned version of blazar-like NLS1s. The ratio of IR to radio flux density (q$_{\rm 22~{\mu}m}$ $=$ log[S$_{\rm 22~{\mu}m}$/S$_{\rm 1.4~GHz}$]) versus radio luminosity plot suggests that KSRs are mostly powered by AGN, while KSRs in NLS1s with low radio luminosity (L$_{\rm 1.4~GHz}$ $<$ 10$^{23.5}$ W~Hz$^{-1}$) may have a contribution from circumnuclear starburst. The trend shown by KSRs in radio luminosity versus radio-size plot indicates that the radio-jets resulting in KSRs are either in the early phase of their evolution or inefficient to grow beyond the host galaxy.
DOI: https://doi.org/10.22323/1.328.0029
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