Results 81 to 90 of about 382 (184)

Fading Light, Fierce Winds: JWST Snapshot of a Sub-Eddington Quasar at Cosmic Dawn

The Astrophysical Journal Letters
The majority of most luminous quasars during the epoch of reionization accrete near or above the Eddington limit, marking the vigorous growth of primitive supermassive black holes (SMBHs).
Jianwei Lyu, George H. Rieke, Meredith Stone, Jane Morrison, Stacey Alberts, Xiangyu Jin, Yongda Zhu, Weizhe Liu, Jinyi Yang   +8 more
doaj   +1 more source

3D SR‐μXCT analysis for lithology detection: Application to Ryugu sample A0159

Meteoritics &Planetary Science, Volume 60, Issue 11, Page 2623-2654, November 2025.
Abstract Extraterrestrial breccia samples are formed through impact‐related processes that combine the fragments of distinct lithologies. As such, they are valuable indicators of the complex formation and evolution history of planetesimals in our solar system.
Léna Jossé, Zélia Dionnet, Alice Aléon‐Toppani, Rosario Brunetto, Andrew King, Emmanuel Gardés, Eva Heripré, Damien Loizeau, Sasha Cryan, Kentaro Hatakeda   +9 more
wiley   +1 more source

Quasar Winds Caught on Acceleration and Deceleration

The Astrophysical Journal Supplement Series
We present an observational study of wind acceleration based on four low-ionization broad absorption line (BAL) quasars (J0136, J1238, J1259, and J1344).
Weimin Yi, P. B. Hall, Zunli Yuan, W. N. Brandt, D. P. Schneider, Zhicheng He, Jin-Ming Bai, Xue-Bing Wu   +7 more
doaj   +1 more source

Extreme outflow velocities and weak UV emission lines indicate quasars shedding their dust cocoons

Astronomy & Astrophysics
The recently discovered low-ionisation broad absorption line (LoBAL) quasar GQ 1309+2904 is unusual due to its very broad, highly blueshifted absorption troughs and an absence of broad emission lines except for Hα.
Ma Guozhen, Geier Stefan J., Fynbo Johan P. U., Christensen Lise, Berdyugin Andrei, Frederiksen Rasmus, Heintz Kasper E., Henriksen Phillip D., Krogager Jens-Kristian, Ledoux Cédric, Piirola Vilppu, Møller Palle, Vejlgaard Simone, Choi Hyunseop   +13 more
doaj   +1 more source

A Potential Link between Nuclear Winds and Cold Gas Outflows on Kiloparsec Scales in Reionization-era Quasars

The Astrophysical Journal
Feedback from accreting supermassive black holes may regulate galaxy evolution, but statistical evidence linking nuclear winds to kiloparsec-scale cold gas outflows remains limited in the early Universe.
Yongda Zhu, Marcia J. Rieke, Luis C. Ho, Yang Sun, George H. Rieke, Feng Yuan, Tom J. L. C. Bakx, George D. Becker, Jinyi Yang, Eduardo Bañados, Manuela Bischetti, Christopher Cain, Xiaohui Fan, Yoshinobu Fudamoto, Seyedazim Hashemi, Ryota Ikeda, Zhiyuan Ji, Xiangyu Jin, Weizhe Liu, Yichen Liu, Jianwei Lyu, Hai-Xia Ma, Tsutomu T. Takeuchi, Hideki Umehata, Feige Wang, Wei Leong Tee   +25 more
doaj   +1 more source

BALNet: Deep-learning-based Detection and Measurement of Broad Absorption Lines in Quasar Spectra

The Astrophysical Journal Supplement Series
Broad absorption line (BAL) quasars serve as critical probes for understanding outflows from active galactic nuclei, black hole accretion, and cosmic evolution.
Yangyang Li, Zhijian Luo, Shaohua Zhang, Du Wang, Jianzhen Chen, Zhu Chen, Hubing Xiao, Chenggang Shu   +7 more
doaj   +1 more source

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Releases 10 to 12

The Astrophysical Journal Supplement Series
We present the quasar catalog from Data Releases 10 to 12 of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey, comprising quasars observed between 2021 September and 2024 June. We robustly identified 11,346 quasars, of
Bing Lyu, Xue-Bing Wu, Jun-Jie Jin, Yuming Fu, Yuxuan Pang, Huimei Wang, Rui Zhu, Su Yao, Yan-Li Ai, Yan-xia Zhang, Hai-long Yuan, Zhi-ying Huo   +11 more
doaj   +1 more source

AGN with extreme X-ray amplitude variations

EPJ Web of Conferences, 2012
We present active galactic nuclei (AGNs) that have shown extreme amplitude variability in X-rays. These AGN appear as bright for long periods, but then suddenly become extremely X-ray weak sources.
Gallo L.C., Leighly K.M., Komossa S., Grupe D.   +3 more
doaj   +1 more source

Microlensing of Broad Absorption Line Quasars: Polarization Variability

Publications of the Astronomical Society of the Pacific, 2000
17 pages, 3 figures, accepted to ...
Belle, Kunegunda E., Lewis, Geraint F.
openaire   +2 more sources

The Quasar-associated 2175 Å Dust Absorbers in the SDSS DR16 Quasar Catalog

The Astrophysical Journal Supplement Series
We present, for the first time, a systematic study of quasar-associated 2175 Å dust absorbers using spectroscopic data from the Sloan Digital Sky Survey Data Release 16 (DR16).
Shaohua Zhang, Yuchong Luo, Shangchun Xie, Chao Gao, Zhijian Luo, Chenggang Shu, Hubing Xiao   +6 more
doaj   +1 more source