A Very Radio-Loud Narrow-Line Seyfert 1: PKS 2004-447

Details A Very Radio-Loud Narrow-Line Seyfert 1: PKS 2004-447 A Very Radio-Loud Narrow-Line Seyfert 1: PKS 2004-447

2001-05-14

arxiv.org/abs/astro-ph/0105213v2

Astronomy and Astrophysics

Astrophysics

15 pages, 4 figures, accepted for publication in ApJ, minor typos changed

Scientific paper

10.1086/322299

We have discovered a very radio-loud Narrow-Line Seyfert 1 candidate: PKS 2004-447. This Seyfert is consistent with the formal definition for NLS1s, although it does not have quite the same spectral features as some typical members of this subclass. Only ROSAT survey data is available at X-ray wavelengths, so it has not been possible to compare this source with other NLS1s at these wavelengths. A full comparison of this source with other members of the subclass will improve our physical understanding of NLS1s. In addition, using standard calculations, we estimate the central black hole to have a mass of $\sim 5 \times 10^6 M_{\odot}$. This does not agree with predictions in the literature, that radio-loud AGN host very massive black holes.

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