Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/26799
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | CACCIANIGA, Alessandro | en_US |
dc.contributor.author | Dallacasa, D. | en_US |
dc.contributor.author | Antón, S. | en_US |
dc.contributor.author | Ballo, L. | en_US |
dc.contributor.author | Berton, M. | en_US |
dc.contributor.author | Mack, K. -H. | en_US |
dc.contributor.author | Paulino-Afonso, A. | en_US |
dc.date.accessioned | 2020-08-25T13:22:14Z | - |
dc.date.available | 2020-08-25T13:22:14Z | - |
dc.date.issued | 2017 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/26799 | - |
dc.description.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. | en_US |
dc.language.iso | eng | en_US |
dc.title | SDSSJ143244.91+301435.3 at VLBI: a compact radio galaxy in a narrow-line Seyfert 1 | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stw2471 | en_US |
dc.identifier.scopus | 2-s2.0-85014730953 | en_US |
dc.identifier.isi | 000393647100016 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/464/2/1474/2282856 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 464 | en_US |
dc.relation.issue | 2 | en_US |
dc.relation.firstpage | 1474 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 7 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ITA | en_US |
dc.contributor.country | PRT | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2017MNRAS.464.1474C | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.orcid | 0000-0002-2339-8264 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
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