SDSS J143244.91+301435.3: a link between radio-loud narrow-line Seyfert 1 galaxies and compact steep-spectrum radio sources?

@article{Caccianiga2014SDSSJA,
  title={SDSS J143244.91+301435.3: a link between radio-loud narrow-line Seyfert 1 galaxies and compact steep-spectrum radio sources?},
  author={Alessandro Caccianiga and Sonia Ant'on and Lucia Ballo and Daniele Dallacasa and Roberto Della Ceca and R. Fanali and Luigi Foschini and Timothy S. Hamilton and Alex Kraus and Tommaso Maccacaro and K. H. Mack and Maria Jo{\~a}o March{\~a} and Ana Paulino-Afonso and Elonora Sani and Paola Severgnini},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={441},
  pages={172-186}
}
We present SDSSJ143244.91+301435.3, a new case of radio-loud narrow line Seyfert 1 (RL NLS1) with a relatively high radio power (P1.4GHz=2.1x10^25 W Hz^-1) and large radioloudness parameter (R1.4=600+/-100). The radio source is compact with a linear size below ~1.4 kpc but, contrary to most of the RL NLS1 discovered so far with such a high R1.4, its radio spectrum is very steep (alpha=0.93) and not supporting a 'blazar-like' nature. Both the small mass of the central super-massive black-hole… 

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