The Astrophysical Journal Supplement Series (Jan 2024)
Changing-look Active Galactic Nuclei from the Dark Energy Spectroscopic Instrument. I. Sample from the Early Data
- Wei-Jian Guo,
- Hu Zou,
- Victoria A. Fawcett,
- Rebecca Canning,
- Stephanie Juneau,
- Tamara M. Davis,
- David M. Alexander,
- Linhua Jiang,
- Jessica Nicole Aguilar,
- Steven Ahlen,
- David Brooks,
- Todd Claybaugh,
- Axel de la Macorra,
- Peter Doel,
- Kevin Fanning,
- Jaime E. Forero-Romero,
- Satya Gontcho A Gontcho,
- Klaus Honscheid,
- Theodore Kisner,
- Anthony Kremin,
- Martin Landriau,
- Aaron Meisner,
- Ramon Miquel,
- John Moustakas,
- Jundan Nie,
- Zhiwei Pan,
- Claire Poppett,
- Francisco Prada,
- Mehdi Rezaie,
- Graziano Rossi,
- Małgorzata Siudek,
- Eusebio Sanchez,
- Michael Schubnell,
- Hee-Jong Seo,
- Jipeng Sui,
- Gregory Tarlé,
- Zhimin Zhou
Affiliations
- Wei-Jian Guo
- ORCiD
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected], [email protected]
- Hu Zou
- ORCiD
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected], [email protected]
- Victoria A. Fawcett
- ORCiD
- School of Mathematics, Statistics and Physics, Newcastle University , Newcastle NE1 7RU, UK
- Rebecca Canning
- ORCiD
- Institute of Cosmology & Gravitation, University of Portsmouth , Dennis Sciama Building, Portsmouth, PO1 3FX, UK
- Stephanie Juneau
- ORCiD
- NSF's NOIRLab , 950 N. Cherry Avenue, Tucson, AZ 85719, USA
- Tamara M. Davis
- ORCiD
- School of Mathematics and Physics, University of Queensland , QLD 4072, Australia
- David M. Alexander
- ORCiD
- Centre for Extragalactic Astronomy, Department of Physics, Durham University , South Road, Durham, DH1 3LE, UK
- Linhua Jiang
- ORCiD
- Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of China
- Jessica Nicole Aguilar
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA
- Steven Ahlen
- ORCiD
- Physics Dept., Boston University , 590 Commonwealth Avenue, Boston, MA 02215, USA
- David Brooks
- ORCiD
- Department of Physics & Astronomy, University College London , Gower Street, London, WC1E 6BT, UK
- Todd Claybaugh
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA
- Axel de la Macorra
- ORCiD
- Instituto de Física, Universidad Nacional Autónoma de México , Cd. de México C.P. 04510, Mexico
- Peter Doel
- Department of Physics & Astronomy, University College London , Gower Street, London, WC1E 6BT, UK
- Kevin Fanning
- ORCiD
- The Ohio State University , Columbus, OH 43210, USA
- Jaime E. Forero-Romero
- ORCiD
- Departamento de Física, Universidad de los Andes , Cra. 1 No. 18A-10, Edificio Ip, CP 111711, Bogotá, Colombia; Observatorio Astronómico, Universidad de los Andes , Cra. 1 No. 18A-10, Edificio H, CP 111711 Bogotá, Colombia
- Satya Gontcho A Gontcho
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA
- Klaus Honscheid
- The Ohio State University , Columbus, OH 43210, USA; Center for Cosmology and AstroParticle Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA; Department of Physics, The Ohio State University , 191 West Woodruff Avenue, Columbus, OH 43210, USA
- Theodore Kisner
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA
- Anthony Kremin
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA
- Martin Landriau
- ORCiD
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA
- Aaron Meisner
- ORCiD
- NSF’s NOIRLab , 950 N. Cherry Ave., Tucson, AZ 85719, USA
- Ramon Miquel
- ORCiD
- Institució Catalana de Recerca i Estudis Avançats , Passeig de Lluís Companys, 23, E-08010 Barcelona, Spain; Institut de Física d’Altes Energies (IFAE) , The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra, Barcelona, Spain
- John Moustakas
- ORCiD
- Department of Physics and Astronomy, Siena College , 515 Loudon Road, Loudonville, NY 12211, USA
- Jundan Nie
- ORCiD
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected], [email protected]
- Zhiwei Pan
- ORCiD
- Kavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of China; Department of Astronomy, School of Physics, Peking University , Beijing 100871, People's Republic of China
- Claire Poppett
- Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USA; Space Sciences Laboratory, University of California , Berkeley, 7 Gauss Way, Berkeley, CA 94720, USA; University of California , Berkeley, 110 Sproul Hall #5800, Berkeley, CA 94720, USA
- Francisco Prada
- ORCiD
- Instituto de Astrofísica de Andalucía (CSIC) , Glorieta de la Astronomía, s/n, E-18008 Granada, Spain
- Mehdi Rezaie
- ORCiD
- Department of Physics, Kansas State University , 116 Cardwell Hall, Manhattan, KS 66506, USA
- Graziano Rossi
- Department of Physics and Astronomy, Sejong University , Seoul, 143-747, Republic of Korea
- Małgorzata Siudek
- Institute of Space Sciences (ICE, CSIC) , Campus UAB, Carrerde Can Magrans, s/n, E-08193 Barcelona, Spain
- Eusebio Sanchez
- ORCiD
- CIEMAT , Avenida Complutense 40, E-28040 Madrid, Spain
- Michael Schubnell
- Department of Physics, University of Michigan , Ann Arbor, MI 48109, USA; University of Michigan , Ann Arbor, MI 48109, USA
- Hee-Jong Seo
- ORCiD
- Department of Physics & Astronomy, Ohio University , Athens, OH 45701, USA
- Jipeng Sui
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected], [email protected]; School of Astronomy and Space Science, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, People's Republic of China
- Gregory Tarlé
- ORCiD
- University of Michigan , Ann Arbor, MI 48109, USA
- Zhimin Zhou
- ORCiD
- Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100012, People's Republic of China [email protected], [email protected]
- DOI
- https://doi.org/10.3847/1538-4365/ad118a
- Journal volume & issue
-
Vol. 270,
no. 2
p. 26
Abstract
Changing-look active galactic nuclei (CL AGNs) can be generally confirmed by the emergence (turn-on) or disappearance (turn-off) of broad emission lines (BELs), associated with a transient timescale (about 100 ∼ 5000 days) that is much shorter than predicted by traditional accretion disk models. We carry out a systematic CL AGN search by crossmatching the spectra coming from the Dark Energy Spectroscopic Instrument and the Sloan Digital Sky Survey. Following previous studies, we identify CL AGNs based on H α , H β , and Mg ii at z ≤ 0.75 and Mg ii , C iii ], and C iv at z > 0.75. We present 56 CL AGNs based on visual inspection and three selection criteria, including 2 H α , 34 H β , 9 Mg ii , 18 C iii ], and 1 C iv CL AGN. Eight cases show simultaneous appearances/disappearances of two BELs. We also present 44 CL AGN candidates with significant flux variation of BELs, but remaining strong broad components. In the confirmed CL AGNs, 10 cases show additional CL candidate features for different lines. In this paper, we find: (1) a 24:32 ratio of turn-on to turn-off CL AGNs; (2) an upper-limit transition timescale ranging from 330 to 5762 days in the rest frame; and (3) the majority of CL AGNs follow the bluer-when-brighter trend. Our results greatly increase the current CL census (∼30%) and would be conducive to exploring the underlying physical mechanism.
Keywords
