Results 21 to 30 of about 1,346 (168)

Image features of spinning regular black holes based on a locality principle

European Physical Journal C: Particles and Fields, 2021
To understand the true nature of black holes, fundamental theoretical developments should be linked all the way to observational features of black holes in their natural astrophysical environments. Here, we take several steps to establish such a link. We
Astrid Eichhorn, Aaron Held
doaj   +1 more source

Tuning Ultra‐Narrow Direct Bandgap in α‐Sn Nanocrystals: A CMOS‐Compatible Approach for THz Applications

Small, EarlyView.
α‐Sn NPs of different sizes are stabilized on Si wafer by means of a CMOS‐compatible process employing microwave irradiation. Unprecedented tunability of the ultranarrow bandgap energy of α‐Sn between 64 and 137 meV (15–35 THz) due to quantum confinement is demonstrated.
Tiziano Bertoli, Elena Stellino, Francesco Minati, Camilla Belloni, Giovanni Tomassucci, Emanuele Bosco, Silvano Battisti, Leonardo Puppulin, Davide Cristofori, Vittorio Morandi, Francesca Rossi, Demetrio Logoteta, Alessandro Nucara, Luisa Barba, Gaetano Campi, Naurang Lal Saini, Fabrizio Palma, Pietro Riello, Michele Back, Fernanda Irrera   +19 more
wiley   +1 more source

Further Evidence for a Direct-collapse Origin of the Supermassive Black Hole at the Center of the ∞ Galaxy

The Astrophysical Journal Letters
The z = 1.14 ∞ galaxy consists of two ringed nuclei with an active supermassive black hole (SMBH) in between them. The system is likely the result of a nearly face-on collision between two disk galaxies with massive bulges. In P. van Dokkum et al.
Pieter van Dokkum, Gabriel Brammer, Connor Jennings, Imad Pasha, Josephine F. W. Baggen   +4 more
doaj   +1 more source

Impact of the Accretion Disk Thickness on the Polarization of the Thermal Emission from Stellar Mass Black Holes

The Astrophysical Journal, 2023
The Imaging X-ray Polarimetry Explorer, launched in 2021 December, enables precision measurements of the energy-dependent polarization of the X-ray emission from stellar mass and supermassive black holes.
Andrew Thomas West, Henric Krawczynski
doaj   +1 more source

JAXA curation for Bennu samples returned by the NASA's OSIRIS‐REx mission

Meteoritics &Planetary Science, EarlyView.
Abstract NASA's OSIRIS‐REx mission successfully collected and returned ~121.6 g of bulk samples from the B‐type, near‐Earth asteroid (101955) Bennu to Earth in September 2023. Upon returning to Earth, the samples were transported to the NASA Johnson Space Center where most of the samples have been stored and processed.
Rui Tahara, Kentaro Hatakeda, Masahiro Nishimura, Kasumi Yogata, Ryota Fukai, Akiko Miyazaki, Toru Yada, Yuma Enokido, Masanao Abe, Seiya Kawasaki, Ryosuke Sakurai, Tatsuaki Okada, Cedric Pilorget, Jean‐Pierre Bibring, Vincent Hamm, Lionel Lourit, Damien Loizeau, Lucie Riu, Koki Yumoto, Yuichiro Cho, Seiji Sugita, Shumpei Nakahara, Shoki Mori, Yuta Aikyo, Shingo Kameda, Roger Stabbins, Yuta Shimizu, Hideaki Miyamoto, Yuya Hitomi, Arisa Nakano, Kana Nagashima, Haruna Sugahara, Shino Suzuki, Shunta Kimura, Tomohiro Usui   +34 more
wiley   +1 more source

Hypervelocity Stars Trace a Supermassive Black Hole in the Large Magellanic Cloud

The Astrophysical Journal
Hypervelocity stars (HVSs) are produced by the Hills mechanism when a stellar binary is disrupted by a supermassive black hole (SMBH). The HVS Survey detected 21 unbound B-type main-sequence stars in the Milky Way’s outer halo that are consistent with ...
Jiwon Jesse Han, Kareem El-Badry, Scott Lucchini, Lars Hernquist, Warren Brown, Nico Garavito-Camargo, Charlie Conroy, Re’em Sari   +7 more
doaj   +1 more source

Observational implications of cosmologically coupled black holes

The Open Journal of Astrophysics, 2023
It was recently suggested that "cosmologically coupled" black holes with masses that increase in proportion to the volume of the Universe might constitute the physical basis of dark energy.
Sohan Ghodla, Richard Easther, M. M. Briel, J. J. Eldridge   +3 more
doaj   +1 more source

The effect of pressure on dihedral angle between liquid Fe‐S and orthopyroxene: Implication for percolative core formation in planetesimals and planetary embryos

Meteoritics &Planetary Science, EarlyView.
Abstract During precursor stages of planet formation, many planetesimals and planetary embryos are considered to have differentiated, forming an iron‐alloy core and silicate mantle. Percolation of liquid iron‐alloy in solid silicates is one of the major possible differentiation processes in these small bodies.
Takumi Miura, Hidenori Terasaki, Hyu Takaki, Kotaro Kobayashi, Geoffrey David Bromiley, Takashi Yoshino   +5 more
wiley   +1 more source

The High Energy X-ray Probe (HEX-P): probing accretion onto stellar mass black holes

Frontiers in Astronomy and Space Sciences
Accretion is a universal astrophysical process that plays a key role in cosmic history, from the epoch of reionization to galaxy and stellar formation and evolution. Accreting stellar-mass black holes in X-ray binaries are one of the best laboratories to
Riley M. T. Connors, John A. Tomsick, Paul Draghis, Benjamin Coughenour, Aarran W. Shaw, Javier A. García, Javier A. García, Dominic Walton, Kristin Madsen, Daniel Stern, Nicole Cavero Rodriguez, Thomas Dauser, Melania Del Santo, Jiachen Jiang, Henric Krawczynski, Honghui Liu, Joseph Neilsen, Michael Nowak, Sean Pike, Andrea Santangelo, Navin Sridhar, Navin Sridhar, Navin Sridhar, Andrew West, Jörn Wilms   +24 more
doaj   +1 more source

Observational Evidence for Cosmological Coupling of Black Holes and its Implications for an Astrophysical Source of Dark Energy

The Astrophysical Journal Letters, 2023
Observations have found black holes spanning 10 orders of magnitude in mass across most of cosmic history. The Kerr black hole solution is, however, provisional as its behavior at infinity is incompatible with an expanding universe.
Duncan Farrah, Kevin S. Croker, Michael Zevin, Gregory Tarlé, Valerio Faraoni, Sara Petty, Jose Afonso, Nicolas Fernandez, Kurtis A. Nishimura, Chris Pearson, Lingyu Wang, David L Clements, Andreas Efstathiou, Evanthia Hatziminaoglou, Mark Lacy, Conor McPartland, Lura K Pitchford, Nobuyuki Sakai, Joel Weiner   +18 more
doaj   +1 more source