PS J1721+8842
| Autor: | R Brilenkov, Simona Vegetti, D Wen, John McKean, C S Mangat, P Hartley, H. R. Stacey |
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| Přispěvatelé: | Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Physics
Structure formation Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences gravitational lensing: strong Astronomy and Astrophysics Quasar quasars: individual: PS J1721+8842 Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Redshift Luminosity Black hole Space and Planetary Science Brightness temperature Astrophysics of Galaxies (astro-ph.GA) Galaxy formation and evolution galaxies: structure Astrophysics::Galaxy Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 508, L64-L68. Oxford University Press |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnrasl/slab106 |
| Popis: | Dual-Active Galactic Nuclei (AGN) are a natural consequence of the hierarchical structure formation scenario, and can provide an important test of various models for black hole growth. However, due to their rarity and difficulty to find at high redshift, very few confirmed dual-AGN are known at the epoch where galaxy formation peaks. Here we report the discovery of a gravitationally lensed dual-AGN system at redshift 2.37 comprising two optical/IR quasars separated by 6.5+/-0.6 kpc, and a third compact (R_eff = 0.45+/-0.02 kpc) red galaxy that is offset from one of the quasars by 1.7+/-0.1 kpc. From Very Large Array imaging at 3 GHz, we detect 600 and 340 pc-scale radio emission that is associated with both quasars. The 1.4 GHz luminosity densities of the radio sources are about 10^24.35 W / Hz, which is consistent with weak jets. However, the low brightness temperature of the emission is also consistent with star-formation at the level of 850 to 1150 M_sun / yr. Although this supports the scenario where the AGN and/or star-formation is being triggered through an ongoing triple-merger, a post-merger scenario where two black holes are recoiling is also possible, given that neither has a detected host galaxy. Comment: 5 pages, 3 figures, accepted for publication in MNRAS Letters |
| Databáze: | OpenAIRE |
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