On the multiwavelength properties of several {\gamma}-ray detected
  narrow-line Seyfert 1 galaxies
  The {\gamma}-ray detection from several radio-loud (RL) narrow-line Seyfert 1
(NLS1) galaxies has enabled us to study powerful relativistic jets in active
galactic nuclei (AGNs) with smaller black hole masses and higher accretion
rates than classical blazars. However, the sample of those {\gamma}-ray
detected NLS1s available is still not large enough for a comprehensive and
statistical study. We provide a summary of our detections and follow-up studies
of three {\gamma}-ray-emitting NLS1s: SDSS J211852.96-073227.5 with flaring
{\gamma}-ray radiation (Yang et al. 2018, Paliya et al. 2018) and SDSS
J122222.55+041315.7 with the highest redshift by far (z~1) (Yao et al. 2015a),
along with the prototype 1H 0323+342 (Zhou et al. 2007, Yao et al. 2015b). And
we will discuss their multiwavelength properties and variability properties,
including implications from high-energy observations in {\gamma}-rays and
X-rays, infrared and radio properties, and correlated variability between
several wavebands.
