Results 211 to 220 of about 94,086 (264)

Study on the multi-wavelength variation of 3C 454.3. [PDF]

Sci Rep
Chen X, Hu S, Jiang Y, Xu J, Huang S, Zhou R, Yin H, Guo D, Li Y, Li H.   +9 more
europepmc   +1 more source

The faintest, extremely variable X-ray tidal disruption event from a supermassive black hole binary? [PDF]

Innovation (Camb)
Huang M, Xue Y, Li S, Liu F, Zhu S, Chen JH, Shen RF, Wang Y, Yang Y, Jiang N, Bauer FE, Vignali C, Zou F, Wang J, Filippenko AV, Luo B, Qin C, Quirola-Vásquez J, Wang JX, Fan L, Sun M, Wu Q, Ni Q, Brink TG, Wang T, Zheng W, Shu X, Zheng X, Lin X, Kong X, Wang Y, Luo Y, Lin Z.   +32 more
europepmc   +1 more source

Creation of a black hole bomb instability in an electromagnetic system. [PDF]

Sci Adv
Cromb M, Braidotti MC, Vinante A, Faccio D, Ulbricht H.   +4 more
europepmc   +1 more source

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Unified Models for Active Galactic Nuclei and Quasars

Annual Review of Astronomy and Astrophysics, 1993
Robert Antonucci
exaly   +2 more sources

Dust-free quasars in the early Universe

Nature, 2010
The most distant quasars known, at redshifts z=6, generally have properties indistinguishable from those of lower-redshift quasars in the rest-frame ultraviolet/optical and X-ray bands. This puzzling result suggests that these distant quasars are evolved
Linhua Jiang, Xiaohui Fan, W Niel Brandt
exaly   +3 more sources

Undermassive Host Galaxies of Five z ∼ 6 Luminous Quasars Detected with JWST

Astrophysical Journal, 2023
We measure host galaxy stellar masses for a sample of five luminous quasars at z ∼ 5–7. Using JWST/NIRCam medium-band images of nearby point-spread function reference stars, we carefully subtract the contribution from the quasar light to place upper and ...
M. Stone, J. Lyu 吕, G. Rieke, S. Alberts, K. Hainline   +4 more
semanticscholar   +1 more source

QUASAR

ACM SIGMOD Record, 2004
Sensor devices are promising to revolutionize our interaction with the physical world by allowing continuous monitoring and reaction to natural and artificial processes at an unprecedented level of spatial and temporal resolution. As sensors become smaller, cheaper and more configurable, systems incorporating large numbers of them become ...
Iosif Lazaridis, Qi Han, Xingbo Yu, Sharad Mehrotra, Nalini Venkatasubramanian, Dmitri V. Kalashnikov, Weiwen Yang   +6 more
openaire   +2 more sources

Quasar

ACM SIGPLAN Notices, 2014
Cloud computing promises flexibility and high performance for users and high cost-efficiency for operators. Nevertheless, most cloud facilities operate at very low utilization, hurting both cost effectiveness and future scalability. We present Quasar, a cluster management system that increases resource utilization while providing consistently
Christina Delimitrou, Christos Kozyrakis
openaire   +1 more source

Quasars

Applied Optics, 1966
A short historical outline of the discovery and a description of observed properties of quasars introduces questions as to their nature. Some of the principal arguments concerning their reality, distance, intrinsic properties and age lead to the conclusion that, while there is room for other points of view; a strong case can be made for the ...
openaire   +2 more sources

Quasars: The Observational Perspectives

2012
The empirical basis of quasar astronomy can be overawing especially in the twenty-first century. A first source of intricacy involves the nomenclature that has evolved to label the multifold phenomenological manifestations now united under the umbrella of active galactic nuclei (AGNs). A further complication involves observations of the many subclasses
D'ONOFRIO, MAURO, Marziani Paola, Sulentic Jack W., Shields Greg, Gaskell Martin, Boroson Todd, Laor Ari, Hawkins Michael, Pronik Vladimir, Sergeev Sergey, Dultzin Deborah, Grupe Dirk, Richards Gordon, Morganti Raffaella, Volvach Aleksander, Zamfir Sebastian, Falcke Heino, Kording Elmar, Elvis Martin, Turner Trace Jane, Kembhavi Ajit, Foschini Luigi, Nesphor Yuri, Franceschini Alberto   +23 more
openaire   +3 more sources