Optical Spectroscopy of Active Galactic Nuclei in SA57

Details Optical Spectroscopy of Active Galactic Nuclei in SA57 Optical Spectroscopy of Active Galactic Nuclei in SA57

2007-10-19

arxiv.org/abs/0710.3696v1

Astronomy and Astrophysics

Astrophysics

7 pages, 8 figures, to appear in A&A

Scientific paper

10.1051/0004-6361:20078727

The cosmological evolution of X-ray-selected and optically selected Active Galactic Nuclei (AGNs) show different behaviours interpreted in terms of two different populations. The difference is evident mainly for low luminosity AGNs (LLAGNs), many of which are lost by optical photometric surveys. We are conducting a spectroscopical study of a composite sample of AGN candidates selected in SA57 following different searching techniques, to identify low luminosity AGNs and break down the sample into different classes of objects. AGN candidates were obtained through optical variability and/or X-ray emission. Of special interest are the extended variable objects, which are expected to be galaxies hosting LLAGNs. Among the 26 classified objects a fair number (9) show typical AGN spectra. 10 objects show Narrow Emission Line Galaxy spectra, and in most of them (8/10) optical variability suggests the presence of LLAGNs.

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