NEAR-INFRARED AND OPTICAL SPECTROSCOPY OF FSC 10214+ 4724

摘要

New infrared and optical spectroscopic observations, obtained with the W. M. Keck Telescope, are reported for the highly luminous infrared source FSC 10214 + 4724. The rest frame optical spectrum shows new emission lines of [Ne Ⅲ], [Ne Ⅴ], [O Ⅰ], [O Ⅱ], [S Ⅱ], and He~+, while the rest frame ultraviolet spectrum shows new lines of O Ⅳ] + Si Ⅳ, N Ⅲ, N Ⅳ], Si Ⅱ, Ne Ⅳ, and possibly N Ⅱ and [Ne Ⅲ], as well as clearly showing that Lyα is self-absorbed. The emission-line spectrum is most characteristic of a Seyfert 2 nucleus. The preponderance of spectroscopic evidence strengthens the case for a dust-enshrouded AGN powering much or most of the observed luminosity. The various spectral lines lead to a wide range in the inferred reddening and ioniza-tion parameter for this system, suggesting that we are viewing several environments through differing extinctions.