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Changing-look Active Galactic Nuclei from the Dark Energy Spectroscopic Instrument. V. Dramatic Variability in High-ionization Broad Emission Lines
Zhi-Qiang Chen, Jun-Jie Jin, Wei-Jian Guo, Sheng-Xiu Sun, Zhi-Wei Pan, Chen-Xu Liu, Hua-Qing Cheng, Jing-Wei Hu, Zhen-Feng Sheng, Hu Zou, Zhao-Bin Chen, Qi Zheng and Qi-Rong Yuan The Astrophysical Journal Supplement Series 282(2) 28 (2026) https://doi.org/10.3847/1538-4365/ae23cb
Identifying AGNs from X-ray detections – I: Metallicity calibrations in AGNs with X-ray luminosity as the primary input parameter
Mark Armah, O L Dors, Rogério Riffel, M V Cardaci, G F Hägele, Rogemar A Riffel and J M Vílchez Monthly Notices of the Royal Astronomical Society 548(1) (2026) https://doi.org/10.1093/mnras/stag560
The MUSE view of Lyman-α nebulae in high redshift radio galaxies
Miguel Coloma Puga, Barbara Balmaverde, Alessandro Capetti, Francesco Massaro and Roberto Gilli Astronomy & Astrophysics 698 A241 (2025) https://doi.org/10.1051/0004-6361/202553837
Metallicity of active galactic nuclei from ultraviolet and optical emission lines – I. Carbon abundance dependence
O L Dors, C B Oliveira, M V Cardaci, G F Hägele, I N Morais, X Ji, R A Riffel, R Riffel, M Mezcua, G C Almeida, P C Santos and M S Z de Mellos Monthly Notices of the Royal Astronomical Society 540(2) 1608 (2025) https://doi.org/10.1093/mnras/staf727
Cosmic-ray ionization of low-excitation lines in active galactic nuclei and starburst galaxies
A possible shutting-down event of mass accretion in an active galactic nucleus at z ∼ 1.8
Tomoki Morokuma, Malte Schramm, Toshihiro Kawaguchi, Josefa Becerra González, Jose Antonio Acosta-Pulido, Nieves Castro-Rodríguez, Kana Morokuma-Matsui, Shintaro Koshida, Junko Furusawa, Hisanori Furusawa, Tsuyoshi Terai, Fumi Yoshida, Kotaro Niinuma and Yoshiki Toba Publications of the Astronomical Society of Japan 77(6) 1350 (2025) https://doi.org/10.1093/pasj/psaf115
Direct estimates of nitrogen abundance for Seyfert 2 nuclei
O L Dors, M V Cardaci, G F Hägele, M Valerdi, G S Ilha, C B Oliveira, R A Riffel, S R Flury, K Z Arellano-Córdova, T Storchi-Bergmann, R Riffel, G C Almeida and I N Morais Monthly Notices of the Royal Astronomical Society 534(4) 3040 (2024) https://doi.org/10.1093/mnras/stae2253
Fast Outflows and Luminous He ii Emission in Dwarf Galaxies with Active Galactic Nuclei (AGN)
Weizhe 伟哲 Liu 刘, Sylvain Veilleux, Gabriela Canalizo, Todd M. Tripp, David S. N. Rupke, Archana Aravindan, Thomas Bohn, Fred Hamann and Christina M. Manzano-King The Astrophysical Journal 965(2) 152 (2024) https://doi.org/10.3847/1538-4357/ad2b63
Theoretical Diagnostics for Narrow-line Regions of Active Galactic Nuclei
Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity–luminosity relation
Mark Armah, Rogério Riffel, O L Dors, Kyuseok Oh, Michael J Koss, Claudio Ricci, Benny Trakhtenbrot, Mabel Valerdi, Rogemar A Riffel and Angela C Krabbe Monthly Notices of the Royal Astronomical Society 520(2) 1687 (2023) https://doi.org/10.1093/mnras/stad217
Near-infrared emission line diagnostics for AGN from the local Universe to z ∼ 3
Antonello Calabrò, Laura Pentericci, Anna Feltre, Pablo Arrabal Haro, Mario Radovich, Lise-Marie Seillé, Ernesto Oliva, Emanuele Daddi, Ricardo Amorín, Micaela B. Bagley, Laura Bisigello, Véronique Buat, Marco Castellano, Nikko J. Cleri, Mark Dickinson, Vital Fernández, Steven L. Finkelstein, Mauro Giavalisco, Andrea Grazian, Nimish P. Hathi, Michaela Hirschmann, Stéphanie Juneau, Jeyhan S. Kartaltepe, Anton M. Koekemoer, Ray A. Lucas, et al. Astronomy & Astrophysics 679 A80 (2023) https://doi.org/10.1051/0004-6361/202347190
beagle-agn I: simultaneous constraints on the properties of gas in star-forming and AGN narrow-line regions in galaxies
A Vidal-García, A Plat, E Curtis-Lake, A Feltre, M Hirschmann, J Chevallard and S Charlot Monthly Notices of the Royal Astronomical Society 527(3) 7217 (2023) https://doi.org/10.1093/mnras/stad3252
Metal enrichment due to embedded stars in AGN discs
Jiamu Huang, Douglas N C Lin and Gregory Shields Monthly Notices of the Royal Astronomical Society 525(4) 5702 (2023) https://doi.org/10.1093/mnras/stad2642
Chemical abundances in Seyfert galaxies – X. Sulphur abundance estimates
Oli L Dors, M Valerdi, R A Riffel, R Riffel, M V Cardaci, G F Hägele, Mark Armah, M Revalski, S R Flury, P Freitas-Lemes, E B Amôres, A C Krabbe, L Binette, A Feltre and T Storchi-Bergmann Monthly Notices of the Royal Astronomical Society 521(2) 1969 (2023) https://doi.org/10.1093/mnras/stad635
Metal Abundances of Intermediate-redshift Active Galactic Nuclei: Evidence for a Population of Lower-metallicity Seyfert 2 Galaxies at z = 0.3–0.4
Gas-phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA: evidence of metal-poor accretion
Janaína C do Nascimento, Oli L Dors, Thaisa Storchi-Bergmann, Nícolas D Mallmann, Rogério Riffel, Gabriele S Ilha, Rogemar A Riffel, Sandro B Rembold, Alice Deconto-Machado, Luiz N da Costa and Mark Armah Monthly Notices of the Royal Astronomical Society 513(1) 807 (2022) https://doi.org/10.1093/mnras/stac771
Multiline Assessment of Narrow-line Regions in z ∼ 3 Radio Galaxies
Koki Terao, Tohru Nagao, Kyoko Onishi, Kenta Matsuoka, Masayuki Akiyama, Yoshiki Matsuoka and Takuji Yamashita The Astrophysical Journal 929(1) 51 (2022) https://doi.org/10.3847/1538-4357/ac5b71
Ionized gas kinematics of cluster AGN at z ∼ 0.8 with KMOS
Marcela G Paillalef, Hector Flores, Ricardo Demarco, et al. Monthly Notices of the Royal Astronomical Society 506(1) 385 (2021) https://doi.org/10.1093/mnras/stab1731
Electron energy distributions in the extended gas nebulae associated with high-z AGN: Maxwell–Boltzmann versus κ distributions
S G Morais, A Humphrey, M Villar Martín, L Binette and M Silva Monthly Notices of the Royal Astronomical Society 506(1) 1389 (2021) https://doi.org/10.1093/mnras/stab1599
Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). XIV. A Candidate Type II Quasar at z = 6.1292
Masafusa Onoue, Yoshiki Matsuoka, Nobunari Kashikawa, Michael A. Strauss, Kazushi Iwasawa, Takuma Izumi, Tohru Nagao, Naoko Asami, Seiji Fujimoto, Yuichi Harikane, Takuya Hashimoto, Masatoshi Imanishi, Chien-Hsiu Lee, Takatoshi Shibuya and Yoshiki Toba The Astrophysical Journal 919(1) 61 (2021) https://doi.org/10.3847/1538-4357/ac0f07
Accretion onto Stars in the Disks of Active Galactic Nuclei
Chemical abundances in the nuclear region of nearby galaxies from the Palomar Survey
B Pérez-Díaz, J Masegosa, I Márquez and E Pérez-Montero Monthly Notices of the Royal Astronomical Society 505(3) 4289 (2021) https://doi.org/10.1093/mnras/stab1522
Chemical abundances in Seyfert galaxies – VII. Direct abundance determination of neon based on optical and infrared emission lines
Mark Armah, O L Dors, C P Aydar, M V Cardaci, G F Hägele, Anna Feltre, R Riffel, R A Riffel and A C Krabbe Monthly Notices of the Royal Astronomical Society 508(1) 371 (2021) https://doi.org/10.1093/mnras/stab2610
Chemical abundances of Seyfert 2 AGNs – IV. Composite models calculated by photoionization + shocks
The Ionized- and Cool-gas Content of the BR1202−0725 System as Seen by MUSE and ALMA
A. B. Drake, F. Walter, M. Novak, E. P. Farina, M. Neeleman, D. Riechers, C. Carilli, R. Decarli, C. Mazzucchelli and M. Onoue The Astrophysical Journal 902(1) 37 (2020) https://doi.org/10.3847/1538-4357/aba832
Chemical abundances of Seyfert 2 AGNs – III. Reducing the oxygen abundance discrepancy
M Armah, E Pérez-Montero, A C Krabbe, et al. Monthly Notices of the Royal Astronomical Society 496(3) 3209 (2020) https://doi.org/10.1093/mnras/staa1781
No Redshift Evolution in the Broad-line-region Metallicity up to z = 7.54: Deep Near-infrared Spectroscopy of ULAS J1342+0928
Masafusa Onoue, Eduardo Bañados, Chiara Mazzucchelli, Bram P. Venemans, Jan-Torge Schindler, Fabian Walter, Joseph F. Hennawi, Irham Taufik Andika, Frederick B. Davies, Roberto Decarli, Emanuele P. Farina, Knud Jahnke, Tohru Nagao, Nozomu Tominaga and Feige Wang The Astrophysical Journal 898(2) 105 (2020) https://doi.org/10.3847/1538-4357/aba193
Metal Enrichment in the Circumgalactic Medium and Lyα Halos around Quasars at z ∼ 3
Yucheng Guo, Roberto Maiolino, Linhua Jiang, Kenta Matsuoka, Tohru Nagao, Oli Luiz Dors, Michele Ginolfi, Nick Henden, Jake Bennett, Debora Sijacki and Ewald Puchwein The Astrophysical Journal 898(1) 26 (2020) https://doi.org/10.3847/1538-4357/ab9b7f
Chemical abundances of Seyfert 2 AGNs – II. N2 metallicity calibration based on SDSS
S P Carvalho, O L Dors, M V Cardaci, et al. Monthly Notices of the Royal Astronomical Society 492(4) 5675 (2020) https://doi.org/10.1093/mnras/staa193
The Fe ii/Mg ii Flux Ratio of Low-luminosity Quasars at z ∼ 3
Semi-empirical metallicity calibrations based on ultraviolet emission lines of type-2 AGNs
O L Dors, A F Monteiro, M V Cardaci, G F Hägele and A C Krabbe Monthly Notices of the Royal Astronomical Society 486(4) 5853 (2019) https://doi.org/10.1093/mnras/stz1242
The mass-metallicity relation of high-z type-2 active galactic nuclei
A Window on the Earliest Star Formation: Extreme Photoionization Conditions of a High-ionization, Low-metallicity Lensed Galaxy at z ∼ 2*
Danielle A. Berg, Dawn K. Erb, Matthew W. Auger, Max Pettini and Gabriel B. Brammer The Astrophysical Journal 859(2) 164 (2018) https://doi.org/10.3847/1538-4357/aab7fa
The nature of luminous Ly α emitters at z ∼ 2–3: maximal dust-poor starbursts and highly ionizing AGN
David Sobral, Jorryt Matthee, Behnam Darvish, et al. Monthly Notices of the Royal Astronomical Society 477(2) 2817 (2018) https://doi.org/10.1093/mnras/sty782
Lyα emission-line reconstruction for high-zQSOs
Bradley Greig, Andrei Mesinger, Ian D. McGreer, Simona Gallerani and Zoltán Haiman Monthly Notices of the Royal Astronomical Society 466(2) 1814 (2017) https://doi.org/10.1093/mnras/stw3210
Active Galactic Nuclei with a Low-metallicity Narrow-line Region
New quantitative nitrogen abundance estimations in a sample of Seyfert 2 active galactic nuclei
O. L. Dors Jr., K. Z. Arellano-Córdova, M. V. Cardaci and G. F. Hägele Monthly Notices of the Royal Astronomical Society: Letters 468(1) L113 (2017) https://doi.org/10.1093/mnrasl/slx036
No evidence for Population III stars or a direct collapse black hole in the z = 6.6 Lyman α emitter ‘CR7’
R. A. A. Bowler, R. J. McLure, J. S. Dunlop, et al. Monthly Notices of the Royal Astronomical Society 469(1) 448 (2017) https://doi.org/10.1093/mnras/stx839
Chemical enrichment and accretion of nitrogen-loud quasars
Rosa Valiante, Bhaskar Agarwal, Melanie Habouzit and Edwige Pezzulli Publications of the Astronomical Society of Australia 34 (2017) https://doi.org/10.1017/pasa.2017.25
THE CONTRIBUTION OF HOST GALAXIES TO THE INFRARED ENERGY OUTPUT OF z ≳ 5.0 QUASARS
On the central abundances of active galactic nuclei and star-forming galaxies
O. L. Dors, M. V. Cardaci, G. F. Hägele, et al. Monthly Notices of the Royal Astronomical Society 453(4) 4103 (2015) https://doi.org/10.1093/mnras/stv1916
A DEEP NARROWBAND IMAGING SEARCH FOR C iv AND He ii EMISSION FROM LyαBLOBS
High-redshift quasars host galaxies: is there a stellar mass crisis?
Rosa Valiante, Raffaella Schneider, Stefania Salvadori and Simona Gallerani Monthly Notices of the Royal Astronomical Society 444(3) 2442 (2014) https://doi.org/10.1093/mnras/stu1613
Metallicity evolution of AGNs from UV emission lines based on a new index
Oli L. Dors, Mónica V. Cardaci, Guillermo F. Hägele and Ângela C. Krabbe Monthly Notices of the Royal Astronomical Society 443(2) 1291 (2014) https://doi.org/10.1093/mnras/stu1218
Outflows from active galactic nuclei: the BLR–NLR metallicity correlation
He II emitters in the VIMOS VLT Deep Survey: Population III star formation or peculiar stellar populations in galaxies at 2
P. Cassata, O. Le Fèvre, S. Charlot, et al. Astronomy & Astrophysics 556 A68 (2013) https://doi.org/10.1051/0004-6361/201220969
Dust formation history of galaxies: A critical role of metallicity dust mass growth by accreting materials in the interstellar medium
Ryosuke S. Asano, Tsutomu T. Takeuchi, Hiroyuki Hirashita and Akio K. Inoue Earth, Planets and Space 65(3) 213 (2013) https://doi.org/10.5047/eps.2012.04.014
THE BALDWIN EFFECT IN THE NARROW EMISSION LINES OF ACTIVE GALACTIC NUCLEI
Quasar feedback in the early Universe: The case of SDSS J1148+5251
Rosa Valiante, Raffaella Schneider, Roberto Maiolino, Stefania Salvadori and Simone Bianchi Monthly Notices of the Royal Astronomical Society: Letters 427(1) L60 (2012) https://doi.org/10.1111/j.1745-3933.2012.01345.x
Impact of grain size distributions on the dust enrichment in high-redshift quasars
Metallicity of the high-redshift Universe traced by radio galaxies
K. Matsuoka, T. Nagao, R. Maiolino, A. Marconi and Y. Taniguchi Proceedings of the International Astronomical Union 5(S265) 179 (2009) https://doi.org/10.1017/S1743921310000499
Metallicity Evolution of AGNs
T. Nagao, R. Maiolino, A. Marconi, K. Matsuoka and Y. Taniguchi Proceedings of the International Astronomical Union 5(S267) 73 (2009) https://doi.org/10.1017/S1743921310005594