Seyfert 2 Galaxies with Spectropolarimetric Observations

Abstract

We present a compilation of radio, infrared, optical and hard X-ray (2-10kev)\ndata for a sample of 90 Seyfert 2 galaxies(Sy2s) with spectropolarimetric\nobservations (41 Sy2s with detection of polarized broad lines (PBL) and 49\nwithout PBL). Compared to Sy2s without PBL, Sy2s with PBL tend to be\nearlier-type spirals, and show warmer mid-infrared color and significant excess\nof emissions (including the hard X-ray(2-10kev), [O {\\sc iii}]$\\lambda$5007,\ninfrared (25 $\\mu$m) and radio). Our analyses indicate that the majority of\nSy2s without PBL are those sources having less powerful AGN activities, most\nlikely caused by low accretion rate. It implies that the detectability of the\npolarized broad emission lines in Sy2s may depend on their central AGN\nactivities in most cases. Based on the available data, we find no compelling\nevidence for the presence of two types of Sy2s, one type of them has been\nproposed to be intrinsically different from Sy2s claimed in Unification Model.\n