Results 1 to 10 of about 2,679 (228)

EDA Complex-Driven Desaturation of Heterocyclic Carbonyl Compounds Enabled by HFIP. [PDF]

Angew Chem Int Ed Engl
In this work, we report a novel light‐mediated desaturation strategy enabled by electron donor–acceptor complex formation. DFT and mechanistic studies reveal that the reaction proceeds via single‐electron transfer, hydrogen atom transfer, and base‐mediated deprotonation sequentially with pyridinium salt serving dually as oxidant and base, and ...
Maiti R, Cauwenbergh R, Nath A, Guimarães ABR, Qin Y, Maseras F, Das S.   +6 more
europepmc   +3 more sources

Inferences from Surface Brightness Fluctuations of Zwicky 3146 via the Sunyaev–Zel’dovich Effect and X-Ray Observations

The Astrophysical Journal, 2023
The galaxy cluster Zwicky 3146 is a sloshing cool-core cluster at z = 0.291 that in Sunyaev–Zel’dovich (SZ) imaging does not appear to exhibit significant pressure substructure in the intracluster medium.
Charles E. Romero, Massimo Gaspari, Gerrit Schellenberger, Tanay Bhandarkar, Mark Devlin, Simon R. Dicker, William Forman, Rishi Khatri, Ralph Kraft, Luca Di Mascolo, Brian S. Mason, Emily Moravec, Tony Mroczkowski, Paul Nulsen, John Orlowski-Scherer, Karen Perez Sarmiento, Craig Sarazin, Jonathan Sievers, Yuanyuan Su   +18 more
doaj   +1 more source

CHANDRA X-Ray Observations of A119: Cold Fronts and a Shock in an Evolved Off-axis Merger

The Astrophysical Journal, 2023
We present Chandra X-ray observations of the dynamically complex galaxy cluster A119 ( z = 0.044). A119 is host to two narrow-angle-tail (NAT) radio sources (0053-015 and 0053-016), whose tails are oriented parallel to each other, despite orthogonally ...
Courtney B. Watson, Elizabeth L. Blanton, Scott W. Randall, Craig L. Sarazin, Arnab Sarkar, John A. ZuHone, E. M. Douglass   +6 more
doaj   +1 more source

Mirror Acceleration of Cosmic Rays in a High-β Medium

The Astrophysical Journal, 2023
In a weakly compressible high- β medium, pitch-angle scattering and the associated scattering acceleration of cosmic rays (CRs) by anisotropic Alfvén and slow modes of magnetohydrodynamic (MHD) turbulence is inefficient.
Alex Lazarian, Siyao Xu
doaj   +1 more source

A Heating Mechanism via Magnetic Pumping in the Intracluster Medium

The Astrophysical Journal, 2023
Turbulence driven by active galactic nuclei activity, cluster mergers, and galaxy motion constitutes an attractive energy source for heating the intracluster medium (ICM).
Francisco Ley, Ellen G. Zweibel, Mario Riquelme, Lorenzo Sironi, Drake Miller, Aaron Tran   +5 more
doaj   +1 more source

Electron Reacceleration via Ion Cyclotron Waves in the Intracluster Medium

The Astrophysical Journal, 2023
In galaxy clusters, the intracluster medium (ICM) is expected to host a diffuse, long-lived, and invisible population of “fossil” cosmic-ray electrons (CRe) with 1–100 MeV energies.
Aaron Tran, Lorenzo Sironi, Francisco Ley, Ellen G. Zweibel, Mario A. Riquelme   +4 more
doaj   +1 more source

The nature of the motions of multiphase filaments in the centers of galaxy clusters

Frontiers in Astronomy and Space Sciences, 2023
The intracluster medium (ICM) in the centers of galaxy clusters is heavily influenced by the “feedback” from supermassive black holes (SMBHs). Feedback can drive turbulence in the ICM and turbulent dissipation can potentially be an important source of ...
Shalini Ganguly, Yuan Li, Valeria Olivares, Yuanyuan Su, Francoise Combes, Sampadaa Prakash, Stephen Hamer, Pierre Guillard, Pierre Guillard, Trung Ha   +9 more
doaj   +1 more source

Modelling the Energy Spectra of Radio Relics

Galaxies, 2021
Radio relics are diffuse synchrotron sources that illuminate shock waves in the intracluster medium. In recent years, radio telescopes have provided detailed observations about relics.
Denis Wittor, Matthias Hoeft, Marcus Brüggen   +2 more
doaj   +1 more source

Formation of multiphase plasma in galactic haloes and an analogy to solar plasma

Frontiers in Astronomy and Space Sciences, 2023
Thermal instability (TI) potentially explains the origin of cold gas in the intracluster medium (ICM), which is heated sufficiently by AGN feedback. The Hα filaments seen in cluster cores provide strong motivation for TI.
Prakriti Pal Choudhury
doaj   +1 more source

Mapping the intracluster medium temperature in the era of NIKA2 and MUSTANG-2 [PDF]

EPJ Web of Conferences, 2022
We present preliminary results from an on-going program that aims at mapping the intracluster medium (ICM) temperature of high redshift galaxy clusters from the MaDCoWS sample using a joint analysis of shallow X-ray data obtained by Chandra and high ...
Ruppin F., Adam R., Ade P., Ajeddig H., André P., Artis E., Aussel H., Beelen A., Benoît A., Berta S., Bing L., Bourrion O., Brodwin M., Calvo M., Catalano A., Decker B., De Petris M., Désert F.-X., Doyle S., Driessen E. F. C., Eisenhardt P. R. M., Gomez A., Gonzalez A. H., Goupy J., Kéruzoré F., Kramer C., Ladjelate B., Lagache G., Leclercq S., Lestrade J.-F., Macías-Pérez J.-F., Maury A., Mauskopf P., Mayet F., McDonald M., Monfardini A., Moravec E., Muñoz-Echeverría M., Perotto L., Pisano G., Ponthieu N., Revéret V., Rigby A. J., Ritacco A., Romero C., Roussel H., Schuster K., Shu S., Sievers A., Stanford S.A., Stern D., Tucker C., Zylka R.   +52 more
doaj   +1 more source