DISCOVERY OF SUPERSTRONG, FADING, IRON LINE EMISSION AND DOUBLE-PEAKED BALMER LINES OF THE GALAXY SDSS J095209.56+214313.3: THE LIGHT ECHO OF A HUGE FLARE

摘要

We report the discovery of superstrong, fading, high-ionization iron line emission in the galaxy SDSS J095209.56+214313.3 (SDSS J0952+2143 hereafter), which must have been caused by an X-ray outburst of large amplitude. SDSS J0952+2143 is unique in its st