Zobrazeno 1 - 10
of 22 723
pro vyhledávání: '"QUASAR"'
Autor:
T. D. Le
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-7 (2024)
Abstract The exploration of potential variations in fundamental physical constants is crucial for testing of Grand Unification Theories (GUTs), which aim to unify the fundamental forces of nature. This study utilizes direct observational tests to exp
Externí odkaz:
https://doaj.org/article/f4557dad343849089f39e1d9697cd7c6
Autor:
Byun, Doyee
Quasars can affect their surrounding environment through a process known as active galactic nucleus (AGN) feedback, through which the quasar can curtail the formation of stars, regulate the evolution of its host galaxy, and affect its surrounding env
Externí odkaz:
https://hdl.handle.net/10919/120962
Autor:
BREITEN, TOBIAS1 tobias.breiten@uni-graz.at, KUNISCH, KARL1,2 karl.kunisch@uni-graz.at
Publikováno v:
ESAIM: Control, Optimisation & Calculus of Variations. Jan2017, Vol. 23 Issue 1, p241-262. 22p.
Publikováno v:
The Astrophysical Journal Letters, Vol 973, Iss 1, p L9 (2024)
Observations of tidal disruption events (TDEs) show signs of nitrogen enrichment reminiscent of other astrophysical sources such as active galactic nuclei and star-forming galaxies. Given that TDEs probe the gas from a single star, it is possible to
Externí odkaz:
https://doaj.org/article/abd73f0a36284f3eb04d06971c5da4ca
Autor:
Sanskriti Das
Publikováno v:
The Astrophysical Journal Letters, Vol 963, Iss 2, p L48 (2024)
We report the first detection of nonthermal broadening of O vii lines in the warm-hot ≈10 ^6 K circumgalactic medium of the Milky Way. We use z = 0 absorption of O vii K α , O vii K β , and O viii K α lines in archival grating data of b > 15° q
Externí odkaz:
https://doaj.org/article/5658e289987448c287671aed5cefe4fe
Autor:
Nico Cappelluti, Adi Foord, Stefano Marchesi, Fabio Pacucci, Angelo Ricarte, Melanie Habouzit, Fabio Vito, Meredith Powell, Michael Koss, Richard Mushotzky
Publikováno v:
Universe, Vol 10, Iss 7, p 276 (2024)
The nature and origin of supermassive black holes (SMBHs) remain an open matter of debate within the scientific community. While various theoretical scenarios have been proposed, each with specific observational signatures, the lack of sufficiently s
Externí odkaz:
https://doaj.org/article/be8323b32b5d47d082ccc7ac96a7c492
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 2, p 211 (2024)
The measurement of continuum time lags in lensed quasars can effectively probe the accretion physics of quasars. This is because microlensing observations of lensed quasars can provide constraints on the half-light radii of quasar accretion disks. By
Externí odkaz:
https://doaj.org/article/733602be62aa4fceb9612f55443fabc9
Autor:
Xiangyu Jin, Jinyi Yang, Xiaohui Fan, Feige Wang, Koki Kakiichi, Romain A. Meyer, George D. Becker, Siwei Zou, Eduardo Bañados, Jaclyn B. Champagne, Valentina D’Odorico, Minghao Yue, Sarah E. I. Bosman, Zheng Cai, Anna-Christina Eilers, Joseph F. Hennawi, Hyunsung D. Jun, Mingyu Li, Zihao Li, Weizhe Liu, Maria Pudoka, Sindhu Satyavolu, Fengwu Sun, Wei Leong Tee, Yunjing Wu
Publikováno v:
The Astrophysical Journal, Vol 976, Iss 1, p 93 (2024)
Understanding when and how reionization happened is crucial for studying the early structure formation and the properties of the first galaxies in the Universe. At z > 5.5, the observed intergalactic medium (IGM) optical depth shows a significant sca
Externí odkaz:
https://doaj.org/article/ecb6fecd511748efb4e90104f9e69cf5
Autor:
Sameer, Nicolas Lehner, J. Christopher Howk, Andrew J. Fox, John M. O’Meara, Benjamin D. Oppenheimer
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 264 (2024)
We analyze the O vi content and kinematics for 126 H i -selected absorbers at 0.14 ≲ z ≲ 0.73 for which the metallicities of their cool photoionized phase have been determined. We separate the absorbers into 100 strong Ly α forest systems (SLFSs
Externí odkaz:
https://doaj.org/article/60525e0c0c8f4b1c9b24b41631bd56dc
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 233 (2024)
Investigating line-locked phenomena within quasars is crucial for understanding the dynamics of quasar outflows, the role of radiation pressure in astrophysical flows, and the star formation history and metallicity of the early Universe. We have init
Externí odkaz:
https://doaj.org/article/15bc2380fb4b4a04bd4f7a8b68188bd9