Disclosing the properties of low-redshift dual AGN through XMM-Newton and SDSS 
spectroscopy

De Rosa, Alessandra; Vignali, Cristian; Husemann, Bernd; Bianchi, Stefano; Bogdanović, Tamara; Guainazzi, Matteo; Herrero-Illana, Rubén; Komossa, S.; Kun, Emma; Loiseau, Nora; Paragi, Zsolt; Perez-Torres, Miguel; Piconcelli, Enrico

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Disclosing the properties of low-redshift dual AGN through XMM-Newton and SDSS spectroscopy

MPS-Authors

De Rosa, Alessandra
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vignali, Cristian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Husemann, Bernd
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bianchi, Stefano
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bogdanović, Tamara
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Guainazzi, Matteo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Herrero-Illana, Rubén
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Komossa, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kun, Emma
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Loiseau, Nora
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Paragi, Zsolt
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Perez-Torres, Miguel
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Piconcelli, Enrico
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.480.1639D
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Citation

De Rosa, A., Vignali, C., Husemann, B., Bianchi, S., Bogdanović, T., Guainazzi, M., et al. (2018). Disclosing the properties of low-redshift dual AGN through XMM-Newton and SDSS spectroscopy. Monthly Notices of the Royal Astronomical Society, 480, 1639-1655.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CE14-D

Abstract

We report on an optical (SDSS) and X-ray (XMM-Newton) study of an optically selected sample of four dual AGN systems at projected separations of 30-60 kpc. All sources are detected in the X-ray band (0.3-10keV); seven objects are optically identified as Seyfert, while one source, optically classified as a low-ionization nuclear emission- line region (LINER), is likely powered by accretion in virtue of its relatively high X-ray luminosity (1.2 × 10⁴¹ erg s^-1). Six of the eight objects are obscured in X-rays with N_H ≥ 10²³ cm^-2; three of these, whose X-ray spectrum is dominated by a reflection component, are likely Compton-thick (N_H ≥ 10²⁴ cm^-2). This finding is in agreement with the hypothesis that galaxy encounters are effective in driving gas inflow toward the nuclear region, thus increasing the obscuration. We compare the absorption properties in our dual AGN with those in larger samples observed in X-rays but selected in different ways (optical, IR, and hard X-rays). We find that the obscured (N_H ≥ 10²² cm^-2) AGN fraction within the larger sample is 84 ± 4 per cent (taking into account the 90 per cent error on the N_H measure) up to large pair separations (̃100 kpc). This is statistically higher than the fraction of obscured AGN in isolated galaxies found in X-ray surveys.