Radio-loud narrow-line Seyfert 1 galaxies with extreme outflows

• 作 者: STEFANIEKOMOSSA;
• 出 处: 国际天文学联合会第312次专题会议
• 发表日期: 2014年期

　　Narrow-line Seyfert 1 galaxies(NLS1)exhibit many extreme properties among AGN,including,on average,super-strong FeⅡ emission,rapid X-ray variability,near-Eddington accretion rates,and rapidly growing low-mass black holes.Their radio properties have only been studied systematically in recent years,revealing a number of surprises: as a class,they are less frequently radio-loud than BLS1 galaxies,but some of them are beamed,gammaray detected and appear like classical blazars,and at least one of them is puzzling due to its exeptional host galaxy morphology.I present a study of a subsample of radio-loud NLS1 galaxies,identified from SDSS,which exhibit exceptionally strong outflows in their emission-line gas; similar to some high-redshift radio galaxies,but in the nearby universe.I discuss scenarios to account for their properties,including outflows driven by radio jets.Radio-loud NLS1 galaxies,as a class,provide us with new insight into the cause(s)of radioloudness,the blazar phenomenon at low black hole masses,and the operation of radio-mode feedback.