EVIDENCE FOR A QUASAR IN THE RADIO GALAXY CYGNUS-A FROM OBSERVATION OF BROAD-LINE EMISSION

被引：54

作者：

ANTONUCCI, R ^{[1
]}

HURT, T ^{[1
]}

KINNEY, A ^{[1
]}

机构：

[1] SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218

来源：

NATURE | 1994年 / 371卷 / 6495期

关键词：

D O I：

10.1038/371313a0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

ACTIVE galaxies are thought to be powered by the accretion of surrounding dust and gas onto central black holes. The unified model(1-3) of active galaxies predicts that narrow-line radio galaxies (NLRGs), which are very luminous at radio wavelengths and have narrow optical emission lines, would appear as quasars-which have broad emission lines-if viewed from a different direction. The nearby NLRG Cygnus A is the most luminous radio source in the local Universe, with a luminosity that lies within the range of that of quasars(4), but the polarization of optical light from this source seems at odds with the quasar model. Here we present evidence, in the form of broad ultraviolet line emission from singly ionized magnesium, that Cygnus A does indeed host a quasar.

引用

页码：313 / 314

页数：2

共 39 条

[1] IMAGING POLARIMETRY OF HIGH-REDSHIFT RADIO GALAXIES [J].