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http://hdl.handle.net/20.500.12386/26799
Titolo: | SDSSJ143244.91+301435.3 at VLBI: a compact radio galaxy in a narrow-line Seyfert 1 | Autori: | CACCIANIGA, Alessandro Dallacasa, D. Antón, S. Ballo, L. Berton, M. Mack, K. -H. Paulino-Afonso, A. |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 464 | Fascicolo: | 2 | Da pagina:: | 1474 | Abstract: | We present very long baseline interferometry (VLBI) observations, carried out with the European Very Long Baseline Interferometry Network (EVN), of SDSSJ143244.91+301435.3, a radio-loud narrow-line Seyfert 1 (RL NLS1) characterized by a steep radio spectrum. The source, compact at Very Large Array resolution, is resolved on the milliarcsec scale, showing a central region plus two extended structures. The relatively high brightness temperature of all components (5 × 10<SUP>6</SUP>-1.3 × 10<SUP>8</SUP> K) supports the hypothesis that the radio emission is non-thermal and likely produced by a relativistic jet and/or small radio lobes. The observed radio morphology, the lack of a significant core, and the presence of a low frequency (230 MHz) spectral turnover are reminiscent of the Compact Steep-Spectrum (CSS) sources. However, the linear size of the source (∼0.5 kpc) measured from the EVN map is lower than the value predicted using the turnover/size relation valid for CSS sources (∼6 kpc). This discrepancy can be explained by an additional component not detected in our observations, accounting for about a quarter of the total source flux density, combined to projection effects. The low core dominance of the source (CD < 0.29) confirms that SDSSJ143244.91+301435.3 is not a blazar, I.e. the relativistic jet is not pointing towards the observer. This supports the idea that SDSSJ143244.91+301435.3 may belong to the `parent population' of flat-spectrum RL NLS1 and favours the hypothesis of a direct link between RL NLS1 and compact, possibly young, radio galaxies. | URI: | http://hdl.handle.net/20.500.12386/26799 | URL: | https://academic.oup.com/mnras/article/464/2/1474/2282856 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw2471 | Bibcode ADS: | 2017MNRAS.464.1474C | Fulltext: | open |
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