Results 91 to 100 of about 500,059 (233)

Circular Differential Scattering Spectroscopy for the Characterization of Single Chiral Nanostructures: Fundamentals, Development, and Perspectives

National Materials, Volume 1, Issue 1, Page 48-71, July 2026.
Circular differential scattering (CDS) spectroscopy relies on a modified dark‐field optical microscope to study single chiral nanostructures, avoiding the averaging effects of ensemble methods. Recently achieving improved detection limits of 1.5%, this robust technique analyzes plasmonic chirality and molecular interactions, with the future goal of ...
Hao Li, Carlos Renero‐Lecuna, Weihai Ni, Luis M. Liz‐Marzán   +3 more
wiley   +1 more source

Abundance Ratios in Dwarf Elliptical Galaxies [PDF]

Proceedings of the International Astronomical Union, 2016
AbstractThe aim of this study is to determine abundance ratios and star formation histories (SFH) of dwarf ellipticals in the nearby Virgo cluster. We perform a stellar population analysis of 39 dEs and study them using index-index and scaling relations. We find an unusual behaviour where [Na/Fe] is under-abundant w.r.t.
Sen, Seyda, Peletier, Reynier F., Toloba, Elisa, Mentz, Jaco J.   +3 more
openaire   +4 more sources

The relation between accretion rate and jet power in X-ray luminous elliptical galaxies [PDF]

, 2006
Using Chandra X-ray observations of nine nearby, X-ray luminous elliptical galaxies with good optical velocity dispersion measurements, we show that a tight correlation exists between the Bondi accretion rates calculated from the observed gas temperature
S. Allen, R. Dunn, A. Fabian, G. Taylor, C. Reynolds   +4 more
semanticscholar   +1 more source

New Observations of Cosmic Noise Absorption in the South American Magnetic Anomaly (SAMA) Using a Next‐Generation Riometer

Space Weather, Volume 24, Issue 7, July 2026.
Abstract This study reports the first observations of cosmic noise power (CNP) and cosmic noise absorption (CNA) obtained with a next‐generation riometer installed at the Southern Space Observatory (SSO/INPE) in Brazil, located within the South American Magnetic Anomaly (SAMA).
J. Moro, E. Correia, C. M. Wrasse, J. R. Costa, J. V. Bageston, C. M. Denardini, A. J. Valcorte, L. C. A. Resende, A. M. Santos, L. A. da Silva, J. P. Marchezi, T. S. Trondsen   +11 more
wiley   +1 more source

Where Have All the Little Red Dots Gone? Supermassive Black Hole Binary Dynamics and Its Impact on Galaxy Properties

The Astrophysical Journal Letters
Recent James Webb Space Telescope observations have revealed a peculiar class of galaxies at redshifts z  ≳ 6, characterized by extremely high central stellar densities and overmassive central supermassive black holes (SMBHs), “little red dots” (LRDs). A
Fazeel Mahmood Khan, Benjamin L. Davis, Andrea Valerio Macciò, Kelly Holley-Bockelmann   +3 more
doaj   +1 more source

The Masses of Nuclear Black Holes in Luminous Elliptical Galaxies and Implications for the Space Density of the Most Massive Black Holes [PDF]

, 2006
Black hole (BH) masses predicted from the M•-σ relationship conflict with predictions from the M•-L relationship for high-luminosity galaxies, such as brightest cluster galaxies (BCGs). The M•-L relationship predicts that some BCGs may harbor BHs with M•
T. Lauer, S. Faber, D. Richstone, K. Gebhardt, S. Tremaine, M. Postman, A. Dressler, M. Aller, A. Filippenko, R. Green, L. Ho, J. Kormendy, J. Magorrian, J. Pinkney   +13 more
semanticscholar   +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

Galactic Density and Evolution Based on the Virial Theorem, Energy Minimization, and Conservation of Angular Momentum

Galaxies, 2018
Spiral galaxies are spinning, internally densified objects. The Virial Theorem explains galactic rotation curves via its linkage of the rotation rate to the gravitational self-potential (Ug) and the moment of inertia of oblate spheroids.
Robert E. Criss, Anne M. Hofmeister
doaj   +1 more source

Hidden No More: Spotlight on Tidal Disruption Events in Active Galactic Nuclei

Astronomische Nachrichten, Volume 347, Issue 5, June 2026.
ABSTRACT Tidal disruption events (TDEs) are typically discovered in previously quiescent galaxies. However, earlier studies have revealed a handful of TDEs occurring in pre‐existing active galactic nuclei (AGN). We discuss AT2019aalc, a promising TDE candidate in an AGN, and compare it to similar sources.
Patrik Milán Veres
wiley   +1 more source

A Catalog of Photometric Redshift and the Distribution of Broad Galaxy Morphologies

Galaxies, 2018
We created a catalog of photometric redshift of ∼3,000,000 SDSS galaxies annotated by their broad morphology. The photometric redshift was optimized by testing and comparing several pattern recognition algorithms and variable selection strategies, and ...
Nicholas Paul, Nicholas Virag, Lior Shamir   +2 more
doaj   +1 more source