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Title: Changing-look Active Galactic Nuclei from the Dark Energy Spectroscopic Instrument. I. Sample from the Early Data

Journal Article · · The Astrophysical Journal. Supplement Series
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  1. Chinese Academy of Sciences (CAS), Beijing (China); University of Michigan, Ann Arbor MI
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Newcastle University (United Kingdom)
  4. University of Portsmouth (United Kingdom)
  5. NSFʼs NOIRLab, Tucson, AZ (United States)
  6. University of Queensland (Australia)
  7. Durham University (United Kingdom)
  8. Peking University, Beijing (China)
  9. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  10. Boston University, MA (United States)
  11. University College London (United Kingdom)
  12. Universidad Nacional Autónoma de México (Mexico)
  13. Ohio State University, Columbus, OH (United States)
  14. Universidad de los Andes, Bogotá (Colombia)
  15. NSF’s NOIRLab, Tucson, AZ (United States)
  16. Institució Catalana de Recerca i Estudis Avançats, Barcelona (Spain); The Barcelona Institute of Science and Technology (Spain)
  17. Siena College, Loudonville, NY (United States)
  18. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
  19. Instituto de Astrofísica de Andalucía (CSIC), Granada (Spain)
  20. Kansas State University, Manhattan, KS (United States)
  21. Sejong University, Seoul (Korea, Republic of)
  22. Institute of Space Sciences (ICE, CSIC), Barcelona (Spain)
  23. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  24. University of Michigan, Ann Arbor, MI (United States)
  25. Ohio University, Athens, OH (United States)
  26. Chinese Academy of Sciences (CAS), Beijing (China); University of Chinese Academy of Sciences, Beijing (China)
+ Show Author Affiliations

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 Hα, Hβ, 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 Hα, 34 Hβ, 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.

Research Organization:
University of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); National Key R&D Program of China; Beijing Municipal Natural Science Foundation; U.S. National Science Foundation (NSF), Division of Astronomical Sciences; National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
SC0019193; AC02-05CH11231
OSTI ID:
2371629
Journal Information:
The Astrophysical Journal. Supplement Series, Journal Name: The Astrophysical Journal. Supplement Series Journal Issue: 2 Vol. 270; ISSN 0067-0049
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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