Wei-Jian Guo
Changing-look Active Galactic Nuclei from the Dark Energy Spectroscopic Instrument. I. Sample from the Early Data
Guo, Wei-Jian; Zou, Hu; Fawcett, Victoria A.; Canning, Rebecca; Juneau, Stephanie; Davis, Tamara M.; Alexander, David M.; Jiang, Linhua; Aguilar, Jessica Nicole; Ahlen, Steven; Brooks, David; Claybaugh, Todd; de la Macorra, Axel; Doel, Peter; Fanning, Kevin; Forero-Romero, Jaime E.; Gontcho A Gontcho, Satya; Honscheid, Klaus; Kisner, Theodore; Kremin, Anthony; Landriau, Martin; Meisner, Aaron; Miquel, Ramon; Moustakas, John; Nie, Jundan; Pan, Zhiwei; Poppett, Claire; Prada, Francisco; Rezaie, Mehdi; Rossi, Graziano; Siudek, Małgorzata; Sanchez, Eusebio; Schubnell, Michael; Seo, Hee-Jong; Sui, Jipeng; Tarlé, Gregory; Zhou, Zhimin
Authors
Hu Zou
Victoria A. Fawcett
Rebecca Canning
Stephanie Juneau
Tamara M. Davis
Professor David Alexander d.m.alexander@durham.ac.uk
Professor
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
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 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.
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 18, 2023 |
Online Publication Date | Jan 29, 2024 |
Publication Date | Feb 1, 2024 |
Deposit Date | Mar 14, 2024 |
Publicly Available Date | Mar 14, 2024 |
Journal | The Astrophysical Journal Supplement Series |
Print ISSN | 0067-0049 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 270 |
Issue | 2 |
Article Number | 26 |
DOI | https://doi.org/10.3847/1538-4365/ad118a |
Public URL | https://durham-repository.worktribe.com/output/2192955 |
Files
Published Journal Article
(10.2 Mb)
PDF
Licence
http://creativecommons.org/licenses/by/4.0/
Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/
Copyright Statement
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any furtherdistribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
You might also like
The high energy X-ray probe (HEX-P): bringing the cosmic X-ray background into focus
(2024)
Journal Article
Downloadable Citations
About Durham Research Online (DRO)
Administrator e-mail: dro.admin@durham.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search