Results 81 to 90 of about 80,758 (270)

Proteomic analysis of the zone of degeneration at the mitosis–meiosis transition stage in wild‐caught male catshark (Scyliorhinus canicula), correlated with an unusually high‐water temperature in the English Channel

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, Stanislas Pilet, Sean Heighton, Benoît Bernay, Pascal Sourdaine   +4 more
wiley   +1 more source

Heating Hot Atmospheres with Active Galactic Nuclei

, 2007
High resolution X-ray spectroscopy of the hot gas in galaxy clusters has shown that the gas is not cooling to low temperatures at the predicted rates of hundreds to thousands of solar masses per year.
Arnaud M, B.R. McNamara, Binney J, Braginskii SI, Cavaliere A, Gallagher JS, Kronberg PP, P.E.J. Nulsen, Pedlar A, Reynolds CS, Roediger E, Sarazin CL, Spitzer L   +12 more
core   +1 more source

Stacking X-Ray Observations of “Little Red Dots”: Implications for Their Active Galactic Nucleus Properties

The Astrophysical Journal Letters
Recent James Webb Space Telescope observations have revealed a population of compact extragalactic objects at z ≳ 4 with red near-infrared colors, which have been dubbed as “Little Red Dots” (LRDs).
Minghao Yue, Anna-Christina Eilers, Tonima Tasnim Ananna, Christos Panagiotou, Erin Kara, Takamitsu Miyaji   +5 more
doaj   +1 more source

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source

Miscellaneous observations of active galactic nuclei. II

, 1997
We observed 37 AGN candidates and classified them on the basis of their spectroscopic properties; three are confirmed QSOs, one is a BL Lac object, nine are Seyfert 1 galaxies, four Seyfert 2s, while twenty are HII regions.Comment: LaTeX 2e, 15 pages (4 ...
Goncalves, A. C., Veron, P., Veron-Cetty, M. -P.   +2 more
core   +1 more source

Reducing the Dimensions of Active Galactic Nuclei Light-curve Manifolds

The Astrophysical Journal
The active galactic nuclei (AGNs) glossary is vast and complex. Depending on the selection method, observing wavelength, and brightness, AGNs are assigned distinct labels, yet the relationship between different selection methods and the diversity of time-
Shoubaneh Hemmati, Jessica Krick, Daniel Stern, Vandana Desai, Andreas Faisst, Lucas Martín-García, Varoujan Gorjian, Aryana Haghjoo, Farnik Nikakhtar, Troy Raen, Sogol Sanjaripour, Brigitta M. Sipőcz, David Shupe   +12 more
doaj   +1 more source

All Data Used in "The effects of Time-Variable Absorption due to Gamma-Ray Bursts In Active Galactic Nuclei Accretion Disks"

, 2022
Michael Ray
openalex   +1 more source

Terrestrial ages of meteorites from the Atacama Desert (Chile) and insights into the past meteorite flux to Earth

Meteoritics &Planetary Science, EarlyView.
Abstract The Atacama Desert in Chile is characterized by its high meteorite density and old meteorite terrestrial ages. In this work, we present new terrestrial ages derived from measurements of the concentration of cosmogenic 36Cl in the metal fraction of 51 ordinary chondrites collected over a 6.8 km2 area located in the Catalina Dense Collection ...
Carine Sadaka, Jérôme Gattacceca, Florian Dumas, Régis Braucher, ASTER Team, Ingo Leya, Mohammad Tauseef, Pierre‐Henri Blard, David Bekaert, Evelyn Füri, Laurent Zimmermann, Anthony Lagain, Hadrien A. R. Devillepoix, Matthieu Gounelle   +13 more
wiley   +1 more source

Transient Relativistic Iron Emission Line from an X-Ray Flaring Supermassive Black Hole

The Astrophysical Journal
We report the discovery of the first transient relativistic iron K α line in an active galactic nucleus (AGN), J1047+5907. The line was detected 21.5 days (rest frame) after an X-ray coronal flare was observed in 2008, and it exhibits significant ...
Xiurui Zhao, Marco Ajello, Francesca Civano, Javier A. García, Elias Kammoun, Stefano Marchesi, Yue Shen, Daniel Stern, Qian Yang, Peter G. Boorman, Fiona Harrison, Erin Kara, Andrealuna Pizzetti, Ross Silver, Kirill V. Sokolovsky, Zachary Stone, Nuria Torres-Albà, Qiaoya Wu, Peixin Zhu   +18 more
doaj   +1 more source

Reverberation mapping of active galactic nuclei: from X-ray corona to dusty torus. [PDF]

iScience, 2021
Cackett EM, Bentz MC, Kara E.
europepmc   +1 more source