Preprint
Sep 2026
Optical spectroscopy of the VHE flat-spectrum radio quasar PKS 0903-57
We report new optical spectroscopic results for the gamma-ray blazar PKS~0903$-$57. The optical properties of this source have historically been complicated to establish, due to a bright foreground star separated from the blazar by only 0.67$^{\prime\prime}$. During its strong high-energy (HE) and very high-energy (VHE...
E. Kasai, P. Goldoni, C. Boisson et al.
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