Results 91 to 100 of about 2,437 (246)

The accreted galaxy: An overview of TESS metal-poor accreted star candidates

Astronomy & Astrophysics
The Milky Way is a mosaic of stars from different origins. In particular, metal-poor accreted star candidates offer a unique opportunity to better understand the accretion history of the Milky Way. In this work, we aim to explore the assembly history of the Milky Way by investigating accreted stars in terms of their ages, dynamical properties, and ...
Danielle de Brito Silva, Paula Jofré, Clare Worley, Keith Hawkins, Payel Das   +4 more
openaire   +2 more sources

A Dialogue on Revolutions and Revolutionaries in Science: A Perspective From Quantum Mechanics

Natural Sciences, Volume 6, Issue 3, July 2026.
ABSTRACT We discuss the notions of scientific revolutions and revolutionaries in the context of the Relativity Revolution and of the First, Second, and Third Quantum Revolutions. We conclude that at the core of the question of what qualifies as a revolution and revolutionary is an assessment of the gradients of knowledge accumulation over time, both at
Ron Folman, Bretislav Friedrich
wiley   +1 more source

Merger-driven Growth of Intermediate-mass Black Holes: Constraints from Hubble Space Telescope Imaging of Hyper-luminous X-Ray Sources

The Astrophysical Journal
Hyper-luminous X-ray sources (HLXs) are extragalactic off-nuclear X-ray sources with luminosities exceeding the theoretical limit for accretion onto stellar-mass compact objects.
R. Scott Barrows, Mar Mezcua, Julia M. Comerford, Daniel Stern   +3 more
doaj   +1 more source

Proton‐Radiation Hardening of High‐Speed Ge/Si Integrated Photodetectors for Space Applications

Nanophotonics, Volume 15, Issue 12, 25 June 2026.
Hydrogen loading is demonstrated as a radiation‐hardening strategy for high‐speed Ge/Si integrated photodetectors under broadband proton irradiation. By suppressing irradiation‐induced leakage‐current growth and mitigating bandwidth degradation, hydrogen‐loaded devices maintain high‐speed operation and improved stability, providing a practical route ...
Junguo Xu, Yingying Zhong, Xiongping Bao, Junfeng Chen, Wenjie Peng, Haotian Hu, Yiti Xiong, Weiye Xia, Xiao Chen, Meisong Liao, Jianhui Bin, Yuchen Wang, Libing Zhou, Weibiao Chen   +13 more
wiley   +1 more source

Identifying Signatures of Inflow onto Face-on Galaxies Using the Balmer Decrement

The Astrophysical Journal
Isolated star-forming galaxies require inflows of fresh gas from the surrounding medium to sustain episodes of star formation over time. However, there are very few direct detections of accretion onto external galaxies.
Meghna Sitaram, Hui Li, Yong Zheng, Greg L. Bryan, Mary Putman, Aaron Smith, Rahul Kannan   +6 more
doaj   +1 more source

A Constellation of Fluorescent Biosensors to Illuminate the Galaxy of Protein Kinases

ChemBioChem, Volume 27, Issue 11, 15 June 2026.
Protein kinases (PKs) are enzymes that catalyze phosphorylation of protein substrates involved in a wide variety of biological signalling pathways. This review describes the different families and mechanisms of action and regulation of protein kinases, together with the different classes of fluorescent biosensors that have been engineered and ...
Timothe Abbura, May C. Morris
wiley   +1 more source

Baryon-induced Collapse of Dark Matter Cores into Supermassive Black Holes

The Astrophysical Journal Letters
Nonlinear structure formation for fermionic dark matter particles leads to dark matter density profiles with a degenerate compact core surrounded by a diluted halo. For a given fermion mass, the core has a critical mass that collapses into a supermassive
C. R. Argüelles, J. A. Rueda, R. Ruffini   +2 more
doaj   +1 more source

Repeating Nuclear Transients From Repeating Partial Tidal Disruption Events

Astronomische Nachrichten, Volume 347, Issue 5, June 2026.
ABSTRACT Extragalactic nuclear transients that exhibit repeating outbursts can be modeled as the repeated dynamical interaction between bound stars and supermassive black holes (SMBHs). A subset of these transients, with recurrence timescales of months‐to‐years, have been explained as accretion flares from the repeated tidal stripping of a star by an ...
Ananya Bandopadhyay, Eric R. Coughlin, Julia Fancher, C. J. Nixon, Dheeraj R. Pasham   +4 more
wiley   +1 more source

Modeling the Spectral Energy Distribution of Active Galactic Nuclei: Implications for Cosmological Simulations of Galaxy Formation

The Astrophysical Journal
Modeling the spectral energy distributions (SEDs) of active galactic nuclei (AGNs) plays a very important role in constraining modern cosmological simulations of galaxy formation.
Tong Su, Qi Guo, Erlin Qiao, Wenxiang Pei, Luis C. Ho, Cedric G. Lacey   +5 more
doaj   +1 more source

Quantifying the Impact of Relativistic Precession on Tidal Disruption Event Light Curves

Astronomische Nachrichten, Volume 347, Issue 5, June 2026.
ABSTRACT The tidal field of a black hole can turn a star into a gas stream whose orbit can precess, especially if the a black hole is rapidly spinning. In this work, we investigate the impact of precession on the light curves of tidal disruption events (TDE).
Diego Calderón, Ondřej Pejcha, Brian D. Metzger, Paul C. Duffell, Stephan Rosswog   +4 more
wiley   +1 more source