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UPA Perpustakaan Universitas Jember

New Active Galactic Nuclei Among the INTEGRAL and SWIFT X-ray Sources

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We present the results of our optical identifications of a set of X-ray sources from the INTE-
GRAL and SWIFT all-sky surveys. The optical data have been obtained with the 1.5-m Russian–Turkish
Telescope (RTT-150). Nine X-ray sources have been identified with active galactic nuclei (AGNs). Two
of them are located in the nearby spiral galaxies MCG-01-05-047 and NGC 973 seen almost edge-on.
One source, IGR J16562-3301, is probably a BL Lac object (blazar). The remaining AGNs are observed
as the starlike nuclei of spiral galaxies whose spectra exhibit broad emission lines. The relation between the
hard X-ray (17–60 keV) luminosity and the [O III] 5007 line luminosity, log L X /L [O III] ≈ 2.1, holds good
for most of the AGNs detected in hard X rays. However, the luminosities of some AGNs deviate from this
relation. The fraction of such objects can reach ∼20%. In particular, the [O III] line flux is lower for two
nearby edge-on spiral galaxies. This can be explained by the effect of absorption in the galactic disks.

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