Results 171 to 180 of about 1,170,090 (200)

Late-follicular androgen and estrogen rise associated with clinical pregnancy in IVF/ICSI with granulosa cell studies. [PDF]

Reprod Fertil
Sririwichitchai R, Sitticharoon C, Keadkraichaiwat I, Maikaew P, Chanheng S, Petyim S.   +5 more
europepmc   +1 more source

Human leukocyte antigen (HLA) class I and II genetic relationships with brain imaging measures: A systematic review and meta-analysis. [PDF]

Brain Behav Immun
Zhang L, Yang C, Zhang W, Lui S, Bishop JR.   +4 more
europepmc   +1 more source

Blazar spectral variability as explained by a twisted inhomogeneous jet [PDF]

Nature, 2017
© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. Blazars are active galactic nuclei, which are powerful sources of radiation whose central engine is located in the core of the host galaxy. Blazar emission is dominated by
Maria Isabel Carnerero Martin, Filippo D'Ammando, Evgenia Kopatskaya   +2 more
exaly   +4 more sources

CORRELATED VARIABILITY IN THE BLAZAR 3C 454.3 [PDF]

Astrophysical Journal, 2009
7 pages, 3 figures, submitted to ApJ ...
Meg Urry
exaly   +4 more sources

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Variability of Blazars

Journal of Astrophysics and Astronomy, 2011
Variability is one of the characteristics of blazars. The rapid variability is superposed on the long term variation. In this work, the variability on different time scales, such as intra-day (IDV), short-term (STV) and long-term (LTV) variations are presented for some sources.
J. H. Fan, Y. Liu, Y. Li, Q. F. Zhang, J. Tao, O. Kurtanidze   +5 more
openaire   +1 more source

Optical variability of blazars

Astronomische Nachrichten, 2019
The analysis of blazars' parameters from BZCAT leads to a conclusion that they do not have the same properties. The preliminary criterion to include an object in the catalog was the strong radio emission; however, two type of radio sources were selected: BL Lacertae (BLL) objects and Flat Spectrum Radio Quasars (FSRQ).
H. V. Abrahamyan, Areg M. Mickaelian, G. M. Paronyan, G. A. Mikayelyan   +3 more
openaire   +1 more source

Variability of the extreme z = 4.72 blazar, GB 1428+4217

Monthly Notices of the Royal Astronomical Society, 1999
We report X-ray and radio variability of GB 1428+4217 which confirm its blazar nature. IR observations reveal a powerful optical-UV component, not obscured by dust, which is suggestive of the presence of a billion solar mass black hole, already formed by
Andrew C. Fabian, A Celotti, G Pooley
exaly   +2 more sources

Optical Variability of Blazars

Chinese Journal of Astronomy and Astrophysics, 2005
Variability is one of the characteristics of blazars. The rapid variability is superposed on the long term variations. In this talk, the variability on different time scales, such as intra-day(IDV), short-term (STV), and long-term (LTV) variations are presented for some sources. For objects with many observations, we have made periodicity analysis, the
openaire   +1 more source

Multiwavelength variability of blazars

Astronomische Nachrichten, 1999
I discuss here multiwavelength variability of blazars concentrating on two prototypical objects: the highly polarized, superluminal quasar 3C 279 and the BL Lac object Mrk 421, one of the brightest sources in the soft X-ray and TeV energy bands. Their apparent diversities can be reconciled with a unification scheme for the whole blazar class.
openaire   +1 more source

Spectral variability of blazars

AIP Conference Proceedings, 2000
Broadband spectral characteristics of different subclasses of γ-ray blazars in different γ-ray intensity states are contrasted and discussed in the framework of currently popular leptonic jet models. Differences between quasars and BL-Lacs may be understood in terms of the dominance of different radiation mechanisms in the gamma-ray regime.
openaire   +1 more source