Results 81 to 90 of about 63,914 (268)
Investigation of the Quasi-periodic Oscillation Phase Lag of RE J1034+396
The Astrophysical JournalWe conduct an in-depth study of the quasi-periodic oscillation (QPO) properties of RE J1034+396 by constructing QPO phase-folded light curves from 10 XMM-Newton observations during 2020–2021.
Wen-Zhong Li +11 more
doaj +1 more source
SUZAKU OBSERVATIONS OF MODERATELY OBSCURED (COMPTON-THIN) ACTIVE GALACTIC NUCLEI SELECTED BY SWIFT/BAT HARD X-RAY SURVEY [PDF]
, 2016 We report the results obtained by a systematic, broadband (0.5–150 keV) X-ray spectral analysis of moderately obscured (Compton-thin, 22 ≤ log N H < 24 ) active galactic nuclei (AGNs) observed with Suzaku and Swift/Burst Alert Telescope (BAT). Our sample
T. Kawamuro +4 more
semanticscholar +1 more source
LOW-MASS ACTIVE GALACTIC NUCLEI WITH RAPID X-RAY VARIABILITY [PDF]
The Astrophysical Journal, 2016 ABSTRACT We present a detailed study of the optical spectroscopic properties of 12 active galactic nuclei (AGNs) with candidate low-mass black holes (BHs) selected by Kamizasa et al. through rapid X-ray variability. The high-quality, echellette Magellan spectra reveal broad Hα emission in all the sources, allowing us to estimate robust ...
Ho, Luis, Kim, Minjin
openaire +2 more sources
The FEBS Journal, EarlyView.Antifreeze proteins from winter‐active spiders were purified using their affinity for ice. After LC–MSMS characterization, corresponding transcripts were identified. The antifreeze protein folds as a β‐solenoid with a large flat ice‐binding site on one surface and can bind to ice crystals and prevent their growth at −4 °C.
Laurie A. Graham +3 more
wiley +1 more source
The Astrophysical JournalWe present a high-resolution X-ray spectroscopic study of the narrow-line Seyfert 1 galaxy NGC 4051 using two XMM-Newton high-resolution Reflection Grating Spectrometer observations.
Roberto Serafinelli +8 more
doaj +1 more source
The Ultraviolet-X-ray connection in AGN outflows
, 2010 In this paper I review the recent progress in understanding the physics of the gas outflowing from active galactic nuclei and its impact on the surrounding environment, using the combined information provided by multiwavelength Ultraviolet-X-ray ...
Costantini, Elisa
core +1 more source
Ensemble X-ray variability of active galactic nuclei. II. Excess variance and updated structure function [PDF]
, 2016 Context. Most investigations of the X-ray variability of active galactic nuclei (AGN) have been concentrated on the detailed analyses of individual, nearby sources.
F. Vagnetti +4 more
semanticscholar +1 more source
Journal of Fish Biology, EarlyView.Abstract In the context of current global change, variations in water temperature are one of the environmental conditions with serious consequences for marine life, including reproductive processes. In the small spotted catshark Scyliorhinus canicula, spermatogenesis occurs in spermatocysts composed of synchronously developing germ cells associated ...
Fabian Jeanne +4 more
wiley +1 more source
The Infrared-X-ray continuum correlation in Active Galactic Nuclei
, 2003 The correlation between the soft X-ray and near infrared emission from AGN is analysed using composite models by the code SUMA. We find new evidences for differences in ranges of parameters which characterize the NLR of Seyfert galaxies and LINERs ...
Campos, P. E. +2 more
core +2 more sources
X-Ray Evolution of Active Galactic Nuclei and Hierarchical Galaxy Formation [PDF]
, 2004 We have incorporated the description of the X-ray properties of Active Galactic Nuclei (AGNs) into a semi-analytic model of galaxy formation, adopting physically motivated scaling laws for accretion triggered by galaxy encounters.
A. Cavaliere +4 more
core +3 more sources