Results 231 to 240 of about 50,755 (263)

Deep space environment empowering drug design and development. [PDF]

Zhong Nan Da Xue Xue Bao Yi Xue Ban
Fang Y, Feng B, Li W, Zhu L, Chen F, Zeng W.   +5 more
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The multiwavelength behaviour of BL Lacertae explained by a wiggling filamentary jet

Raiteri C.
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Feedback mechanisms stopping the star formation in a pair of massive galaxies in the early Universe

Pérez-González P, D'Eugenio F, Pino BRD, Perna M, Uebler H, Maiolino R, Arribas S, Lamperti I, Bunker A, Carniani S, Charlot S, Willott C, Böker T, Parlanti E, Scholtz J, Venturi G, Barro G, Costantin L, Navarro IM, Dunlop J, Magee D, Cresci G.   +21 more
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X-rays from active galactic nuclei ? Hard component

Space Science Reviews, 1981
It is now well known that X-ray emission in active galactic nuclei (AGN) is a fairly common phenomenon (see M.J. Rees’s review in this volume). By examining the recent observational information from Ariel V, HEAO-1, and the Einstein Observatory, we have reached the conclusion (Tsuruta 1981) that the following interpretation may be used as a relevant ...
S. Tsuruta, F. Takahara, S. Ichimaru
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Hard X-rays emission from active galactic nuclei

Advances in Space Research, 1984
Abstract The X-Rays emission from Active Galactic Nuclei has been known since the first observations obtained by Uhuru. their X-Rays spectra are determining to investigate the radiation process and for the diffuse X-Rays background problem. We will present spectral observations of AGN's in the range 20–100 KeV obtained with a one square meter area ...
P. Ubertini, A. Bazzano, C.D. La Padula, V.F. Polcaro, G. Zambon, R.K. Manchanda   +5 more
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X-ray timing studies of Active Galactic Nuclei

AIP Conference Proceedings, 2008
We present a power spectral analysis survey of 24 active galactic nuclei (AGN). We combine X‐ray observations to produce a power spectrum covering a broad range of Fourier frequencies and fit the power spectrum of each AGN using a single‐bend power‐law model.
D. P. Summons, I. M. McHardy, P. Uttley, P. Arévalo, A. Bhaskar, Ye-Fei Yuan, Xiang-Dong Li, Dong Lai   +7 more
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X-Ray Variability in Active Galactic Nuclei

1998
X-ray variability is a distinguishing property of Active Galactic Nuclei (AGN), and the energetics and time scales of the emission dictate that the X-rays must originate very close to the central engine. In this review I discuss two basic topics from AGN variability research.
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X-Ray Spectra of Active Galactic Nuclei

1980
There are a variety of galaxies which are classified as nuclearactive, ranging from those which have nuclei which are merely distinguishable from a stellar component all the way to QSO’s. The subject of this lecture will be only those extreme cases (Seyfert I, BL Lac and quasar) which constitute the most intense compact X-ray sources which are ...
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The X-Ray Spectra of Active Galactic Nuclei

Physica Scripta, 1984
Recent observations of the X-ray spectra of active galactic nuclei are reviewed. After an outline of the properties of these sources deduced from observations at other wavelengths, the relevance of X-ray spectra to our understanding of the X-ray emission mechanisms and of the ultimate source of energy is discussed.
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