Dark Energy Survey Identification of A Low-Mass Active Galactic Nucleus at Redshift 0.823 from Optical Variability

Autor: Daniel Gruen, S. Everett, Marcos Lima, Colin J. Burke, K. Honscheid, Kyler Kuehn, A. Roodman, Luiz N. da Costa, D. W. Gerdes, David J. Brooks, M. Costanzi, Brad E. Tucker, Ricardo L. C. Ogando, A. K. Romer, Devon L. Hollowood, C. Lidman, E. J. Sanchez, Daniela Carollo, Peter Doel, Yu-Ching Chen, Michel Aguena, Aurelio Carnero Rosell, Emmanuel Bertin, E. Suchyta, Enrique Gaztanaga, N. E. Sommer, Juan Garcia-Bellido, Michael Schubnell, Samuel Hinton, G. Gutierrez, V. Scarpine, Eric Morganson, Juan de Vicente, Molly E. C. Swanson, Marcelle Soares-Santos, T. N. Varga, S. Allam, Robert A. Gruendl, Santiago Serrano, F. Paz-Chinchón, Anais Möller, Xin Liu, Kedar A. Phadke, Tim Eifler, Santiago Avila, A. A. Plazas, Ramon Miquel, Marcio A. G. Maia, J. Gschwend, Felipe Menanteau, Kaiwen Zhang, Matias Carrasco Kind, David J. James, Gregory Tarle, Hengxiao Guo, Shantanu Desai, Yue Shen, Mathew Smith, Antonella Palmese
Přispěvatelé: Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), DES, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Guo, Hengxiao, Burke, Colin J., Liu, Xin, Phadke, Kedar A., Zhang, Kaiwen, Chen, Yu-Ching, Gruendl, Robert A., Lidman, Christopher, Shen, Yue, Morganson, Eric, Aguena, Michel, Allam, Sahar, Avila, Santiago, Bertin, Emmanuel, Brooks, David, Rosell, Aurelio Carnero, Carollo, Daniela, Kind, Matias Carrasco, Costanzi, Matteo, da Costa, Luiz N., De Vicente, Juan, Desai, Shantanu, Doel, Peter, Eifler, Tim F., Everett, Spencer, García-Bellido, Juan, Gaztanaga, Enrique, Gerdes, David W., Gruen, Daniel, Gschwend, Julia, Gutierrez, Gaston, Hinton, Samuel R., Hollowood, Devon L., Honscheid, Klau, James, David J., Kuehn, Kyler, Lima, Marco, Maia, Marcio A. G., Menanteau, Felipe, Miquel, Ramon, Möller, Anai, Ogando, Ricardo L. C., Palmese, Antonella, Paz-Chinchón, Francisco, Plazas, Andrés A., Romer, Anita K., Roodman, Aaron, Sanchez, Eusebio, Scarpine, Vic, Schubnell, Michael, Serrano, Santiago, Smith, Mathew, Soares-Santos, Marcelle, Sommer, Natalia E., Suchyta, Eric, Swanson, Molly E. C., Tarle, Gregory, Tucker, Brad E., Varga, Tamas N. (DES Collaboration)
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2020, 496 (3), pp.3636-3647. ⟨10.1093/mnras/staa1803⟩
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2020, 496 (3), pp.3636-3647. ⟨10.1093/mnras/staa1803⟩
ISSN: 0035-8711
1365-2966
DOI: 10.1093/mnras/staa1803⟩
Popis: We report the identification of a low-mass AGN, DES J0218$-$0430, in a redshift $z = 0.823$ galaxy in the Dark Energy Survey (DES) Supernova field. We select DES J0218$-$0430 as an AGN candidate by characterizing its long-term optical variability alone based on DES optical broad-band light curves spanning over 6 years. An archival optical spectrum from the fourth phase of the Sloan Digital Sky Survey shows both broad Mg II and broad H$\beta$ lines, confirming its nature as a broad-line AGN. Archival XMM-Newton X-ray observations suggest an intrinsic hard X-ray luminosity of $L_{{\rm 2-12\,keV}}\sim7.6\pm0.4\times10^{43}$ erg s$^{-1}$, which exceeds those of the most X-ray luminous starburst galaxies, in support of an AGN driving the optical variability. Based on the broad H$\beta$ from SDSS spectrum, we estimate a virial BH mass of $M_{\bullet}\approx10^{6.43}$-$10^{6.72}M_{\odot}$ (with the error denoting 1$\sigma$ statistical uncertainties only), consistent with the estimation from OzDES, making it the lowest mass AGN with redshift $>$ 0.4 detected in optical. We estimate the host galaxy stellar mass to be $M_{\ast}\sim10^{10.5\pm0.3}M_{\odot}$ based on modeling the multi-wavelength spectral energy distribution. DES J0218$-$0430 extends the $M_{\bullet}$-$M_{\ast}$ relation observed in luminous AGNs at $z\sim1$ to masses lower than being probed by previous work. Our work demonstrates the feasibility of using optical variability to identify low-mass AGNs at higher redshift in deeper synoptic surveys with direct implications for the upcoming Legacy Survey of Space and Time at Vera C. Rubin Observatory.
Comment: 13 pages, 8 figures, 1 table, accepted to MNRAS
Databáze: OpenAIRE
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