The VMC survey – XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds
Article
Pennock, Clara M., van Loon, Jacco Th., Anih, Joy O., Maitra, Chandreyee, Haberl, Frank, Sansom, Anne E., Ivanov, Valentin D., Cowley, Michael J., Afonso, Jose, Anton, Sonia, Cioni, Maria-Rosa L., Craig, Jessica E. M., Filipovic, Miroslav D., Hopkins, Andrew M., Nanni, Ambra, Prandoni, Isabella and Vardoulaki, Eleni. 2022. "The VMC survey – XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds." Monthly Notices of the Royal Astronomical Society. 515 (4), pp. 6046-6065. https://doi.org/10.1093/mnras/stac2096
| Article Title | The VMC survey – XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds |
|---|---|
| ERA Journal ID | 1074 |
| Article Category | Article |
| Authors | Pennock, Clara M., van Loon, Jacco Th., Anih, Joy O., Maitra, Chandreyee, Haberl, Frank, Sansom, Anne E., Ivanov, Valentin D., Cowley, Michael J., Afonso, Jose, Anton, Sonia, Cioni, Maria-Rosa L., Craig, Jessica E. M., Filipovic, Miroslav D., Hopkins, Andrew M., Nanni, Ambra, Prandoni, Isabella and Vardoulaki, Eleni |
| Journal Title | Monthly Notices of the Royal Astronomical Society |
| Journal Citation | 515 (4), pp. 6046-6065 |
| Number of Pages | 20 |
| Year | 2022 |
| Publisher | Oxford University Press |
| Place of Publication | United Kingdom |
| ISSN | 0035-8711 |
| 1365-2966 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac2096 |
| Web Address (URL) | https://academic.oup.com/mnras/article/515/4/6046/6651397 |
| Abstract | Following the discovery of SAGE0536AGN (z ∼0.14), with the strongest 10-μm silicate emission ever observed for an active galactic nucleus (AGN), we discovered SAGE0534AGN (z ∼1.01), a similar AGN but with less extreme silicate emission. Both were originally mistaken as evolved stars in the Magellanic Clouds. Lack of far-infrared emission, and therefore star formation, implies we are seeing the central engine of the AGN without contribution from the host galaxy. They could be a key link in galaxy evolution. We used a dimensionality reduction algorithm, t-distributed stochastic neighbour embedding with multiwavelength data from Gaia EDR3, VISTA survey of the Magellanic Clouds, AllWISE, and the Australian Square Kilometre Array Pathfinder to find these two unusual AGNs are grouped with 16 other objects separated from the rest, suggesting a rare class. Our spectroscopy at South African Astronomical Observatory/Southern African Large Telescope and literature data confirm at least 14 of these objects are extragalactic (0.13 < z < 1.23), all hosting AGN. Using spectral energy distribution fitter C igale we find that the majority of dust emission ($\gt 70 {{\ \rm per\ cent}}$) in these sources is due to the AGN. Host galaxies appear to be either in or transitioning into the green valley. There is a trend of a thinning torus, increasing X-ray luminosity, and decreasing Eddington ratio as the AGN transition through the green valley, implying that as the accretion supply depletes, the torus depletes and the column density reduces. Also, the near-infrared variability amplitude of these sources correlates with attenuation by the torus, implying the torus plays a role in the variability. |
| Keywords | (galaxies:) Magellanic Clouds; (galaxies:) quasars: emission lines; galaxies: evolution |
| Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
| Byline Affiliations | Keele University, United Kingdom |
| Max Planck Society, Germany | |
| University of Central Lancashire, United Kingdom | |
| European Southern Observatory, Germany | |
| Queensland University of Technology | |
| Centre for Astrophysics | |
| University of Lisbon, Portugal | |
| University of Coimbra, Portugal | |
| Leibniz Institute for Astrophysics, Germany | |
| Western Sydney University | |
| Macquarie University | |
| National Centre for Nuclear Research, Poland | |
| INAF Institute for Radioastronomy, Italy | |
| Karl Schwarzschild Observatory, Germany |
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