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A variable activegalactic nucleus at z= 2.06 triply-imagedby the galaxy clusterMACS J0035.4−2015 Lukas J. FurtakRamesh MainaliAdi Zitrin2023 год

A variable active galactic nucleus at z = 2.06 triply-imaged by the galaxy cluster MACS J0035.4−2015
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Аннотация: We report the discovery of a triply imaged active galactic nucleus (AGN), lensed by the galaxy cluster MACS J0035.4-2015 ($z_{\mathrm{d}}=0.352$). The object is detected in Hubble Space Telescope imaging taken for the RELICS program. It appears to have a quasi-stellar nucleus consistent with a point-source, with a de-magnified radius of $r_e\lesssim100$ pc. The object is spectroscopically confirmed to be an AGN at $z_{\mathrm{spec}}=2.063\pm0.005$ showing broad rest-frame UV emission lines, and is detected in both X-ray observations with Chandra and in ALCS ALMA band 6 (1.2 mm) imaging. It has a relatively faint rest-frame UV luminosity for a quasar-like object, $M_{\mathrm{UV},1450}=-19.7\pm0.2$. The object adds to just a few quasars or other X-ray sources known to be multiply lensed by a galaxy cluster. Some diffuse emission from the host galaxy is faintly seen around the nucleus and there is a faint object nearby sharing the same multiple-imaging symmetry and geometric redshift, possibly an interacting galaxy or a star-forming knot in the host. We present an accompanying lens model, calculate the magnifications and time delays, and infer physical properties for the source. We find the rest-frame UV continuum and emission lines to be dominated by the AGN, and the optical emission to be dominated by the host galaxy of modest stellar mass $M_{\star}\simeq10^{9.2} \mathrm{M}_{\odot}$. We also observe some variation in the AGN emission with time, which may suggest that the AGN used to be more active. This object adds a low-redshift counterpart to several relatively faint AGN recently uncovered at high redshifts with HST and JWST.
Год издания: 2023
Авторы: Lukas J. Furtak, Ramesh Mainali, Adi Zitrin, Adèle Plat, Seiji Fujimoto, Megan Donahue, Erica J. Nelson, F. E. Bauer, R. Uematsu, G. B. Caminha, Felipe Andrade-Santos, Larry Bradley, K. I. Caputi, S. Charlot, Jacopo Chevallard, Dan Coe, Emma Curtis-Lake, D. Espada, Brenda Frye, K. K. Knudsen, Anton M. Koekemoer, Kotaro Kohno, Vasily Kokorev, Nicolas Laporte, Minju Lee, B. C. Lemaux, G. Magdis, Keren Sharon, Daniel P. Stark, Yuanyuan Su, Katherine A. Suess, Y. Ueda, Hideki Umehata, Alba Vidal-García, John F. Wu
Издательство: Oxford University Press
Источник: Monthly Notices of the Royal Astronomical Society
Ключевые слова: Galaxies: Formation, Evolution, Phenomena, Astrophysical Phenomena and Observations, Astronomy and Astrophysical Research
Другие ссылки: Monthly Notices of the Royal Astronomical Society (HTML)
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