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GMP-selected dual and lensed AGNs: Selection function and classification based on near-IR colors and resolved spectra from VLT/ERIS, Keck/OSIRIS, and LBT/LUCI

Journal
ASTRONOMY & ASTROPHYSICS
Date Issued
2023
Author(s)
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Scialpi, M.
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Ciurlo, A.
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Yeh, S.
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Tozzi, G.
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Carniani, S.
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CICONE, CLAUDIA
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NARDINI, Emanuele
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Rubinur, K.
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SEVERGNINI, Paola
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Ulivi, L.
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Venturi, G.
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Vignali, C.
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Volonteri, M.
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Ghose, E.
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CARBONARO, Luca
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Power, J.
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Guerra Ramon, J. C.
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Lefebvre, M.
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Cavallaro, A.
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Davies, R.
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Macintosh, M.
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Taylor, W.
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Feuchtgruber, H.
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Kravchenko, K.
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Rau, C.
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Sturm, E.
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Wiezorrek, E.
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Dallilar, Y.
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Kenworthy, M.
DOI
Abstract
The Gaia Multipeak (GMP) technique can be used to identify large numbers of dual or lensed active galactic nucleus (AGN) candidates at subarcsec separation, allowing us to study both multiple supermassive black holes (SMBHs) in the same galaxy and rare, compact lensed systems. The observed samples can be used to test the predictions of the models of SMBH merging when (1) the selection function of the GMP technique is known, and (2) each system has been classified as a dual AGN, a lensed AGN, or an AGN/star alignment. Here we show that the GMP selection is very efficient for separations above 0.15″ when the secondary (fainter) object has a magnitude G ≲ 20.5. We present the spectroscopic classification of five GMP candidates using VLT/ERIS and Keck/OSIRIS and compare them with the classifications obtained from (a) the near-IR colors of seven systems obtained with LBT/LUCI, and (b) the analysis of the total spatially unresolved spectra. We conclude that colors and integrated spectra can already provide reliable classifications of many systems. Finally, we summarize the confirmed dual AGNs at z > 0.5 selected by the GMP technique, and compare this sample with other such systems from the literature, concluding that GMP can provide a large number of confirmed dual AGNs at separations below 7 kpc....
Volume
680
Start page
A53
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2023A&A...680A..53M
Rights
open.access
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