LINE EMISSION FROM ANOTHER RELATIVISTIC ACCRETION DISK - 3C-332

Observational and theoretical investigations are reviving interest in the hypothesis that the broad emission lines in some active galactic nuclei (AGNs) might arise in a relativistic accretion disk. But until now only one object, Arp 102B, has displayed the distinctive double-peaked, asymmetric line shape which is fitted well by the disk model. This Letter reports the discovery of a line profile in a second radio galaxy, 3C 332 (z = 0.1511), which is so similar to that of Arp 102B as to suggest the existence of a small but distinct class of objects in which the broad emission lines arise largely in the disk. In the context of the model, the line-emitting region in 3C 332 lies between r1 ∼ 175 and r2 ∼ 525rg. In comparison, the line profile of Arp 102B is fitted with r1 ∼ 350 and r2 ∼ 1000. All aspects of the model developed for Arp 102B are consistent with the properties of 3C 332.