DELVING INTO X-RAY OBSCURATION OF TYPE 2 AGN, NEAR AND FAR

作者：LaMassa Stephanie M^*; Yaqoob Tahir; Ptak Andrew F; Jia Jianjun; Heckman Timothy M; Gandhi Poshak; Urry C Meg

来源：Astrophysical Journal, 2014, 787(1): 61.

DOI：10.1088/0004-637X/787/1/61

• galaxies: active
• galaxies: Seyfert
• X-rays: general

Using self-consistent, physically motivated models, we investigate the X-ray obscuration in 19 Type 2 [O III] 5007 angstrom selected active galactic nuclei (AGNs), 9 of which are local Seyfert 2 galaxies and 10 of which are Type 2 quasar candidates. We derive reliable line-of-sight and global column densities for these objects, which is the first time this has been reported for an AGN sample; four AGNs have significantly different global and line-of-sight column densities. Five sources are heavily obscured to Compton-thick. We comment on interesting sources revealed by our spectral modeling, including a candidate "naked" Sy2. After correcting for absorption, we find that the ratio of the rest-frame, 2-10 keV luminosity (L-2-10 keV,L-in) to L-[O III] is 1.54 +/- 0.49 dex which is essentially identical to the mean Type 1 AGN value. The Fe K alpha luminosity is significantly correlated with L-[O III] but with substantial scatter. Finally, we do not find a trend between L-2-10 keV,L-in and global or line-of-sight column density, between column density and redshift, between column density and scattering fraction, or between scattering fraction and redshift.

• 出版日期2014-5-20