Results 31 to 40 of about 738 (163)

Searching for Highly Magnified Stars at Cosmological Distances: Discovery of a Redshift 0.94 Blue Supergiant in Archival Images of the Galaxy Cluster MACS J0416.1-2403 [PDF]

The Astrophysical Journal, 2019
Abstract Individual highly magnified stars have been recently discovered at lookback times of more than half the age of the universe, in lensed galaxies that straddle the critical curves of massive galaxy clusters. Having established their detectability, it is now important to carry out systematic searches for them in order to establish ...
Wenlei Chen, Patrick L. Kelly, Jose M. Diego, Masamune Oguri, Liliya L. R. Williams, Adi Zitrin, Tommaso L. Treu, Nathan Smith, Thomas J. Broadhurst, Nick Kaiser, Ryan J. Foley, Alexei V. Filippenko, Laura Salo, Jens Hjorth, Jonatan Selsing   +14 more
openaire   +5 more sources

Measuring the distance-redshift relation with the cross-correlation of gravitational wave standard sirens and galaxies [PDF]

Physical Review D, 2016
Gravitational waves from inspiraling compact binaries are known to be an excellent absolute distance indicator, yet it is unclear whether electromagnetic counterparts of these events are securely identified for measuring their redshifts, especially in the case of black hole-black hole mergers such as the one recently observed with the Advanced LIGO. We
openaire   +2 more sources

The THESEUS Space Mission and the Infrared Telescope Calibration Unit

Astronomische Nachrichten, EarlyView.
ABSTRACT The Transient High‐Energy Sky and Early Universe Surveyor (THESEUS) is an ESA M7 mission concept currently in Phase A, designed to exploit gamma‐ray bursts to probe the early Universe while advancing multi‐messenger and time‐domain astrophysics. To achieve its ambitious goals, THESEUS will combine wide‐band x‐ray and gamma‐ray monitors with an
András Péter Joó, Rebeka Gyöngyi Kiss, Lorenzo Amati, Bendegúz Koncz, Örs Detre, Gyula Zilizi, Zsolt Bagoly, István I. Rácz, Sándor Pintér, L. Viktor Tóth   +9 more
wiley   +1 more source

Mapping the dynamics, star-formation rates, and chemical properties of galaxies with integral field spectroscopy [PDF]

, 2005
Major advances in the development of instruments for eight and ten meter class telescopes are revolutionising our understanding of galaxy formation. In particular, Integral Field Spectrographs (which produce a three dimensional {x, y, velocity) map of a ...
Swinbank, Anthony Mark, Swinback, Anthony Mark   +1 more
core  

Confirmation and refutation of very luminous galaxies in the early universe

, 2023
During the first 500 million years of cosmic history, the first stars and galaxies formed, seeding the Universe with heavy elements and eventually reionizing the intergalactic medium. Observations with JWST have uncovered a surprisingly high abundance of
Kartaltepe, Jeyhan S., Bagley, Micaela B., Fernández, Vital, Zavala, Jorge A., Casey, Caitlin M., Haro, Pablo Arrabal, Finkelstein, Steven L., Larson, Rebecca L., Hutchison, Taylor A., Dunlop, James S., Weiner, Benjamin J., Jung, Intae, Ferguson, Henry C., Amorín, Ricardo O., Cullen, Fergus, Cohen, Seth H., Carnall, Adam, Dickinson, Mark, Fujimoto, Seiji, Buat, Véronique, Carnall, Adam C., Koekemoer, Anton M., Pirzkal, Norbert, McLeod, Derek J., Kocevski, Dale D., Burgarella, Denis, McLure, Ross J., Trump, Jonathan R., Donnan, Callum T., Wilkins, Stephen M., Giavalisco, Mauro, Huertas-Company, Marc, Lucas, Ray A., Chworowsky, Katherine, Seillé, Lise-Marie, Papovich, Casey, Krips, Melanie, Arrabal Haro, Pablo, Pérez-González, Pablo G.   +38 more
core   +3 more sources

EXTRACTING ANGULAR DIAMETER DISTANCE AND EXPANSION RATE OF THE UNIVERSE FROM TWO-DIMENSIONAL GALAXY POWER SPECTRUM AT HIGH REDSHIFTS: BARYON ACOUSTIC OSCILLATION FITTING VERSUS FULL MODELING [PDF]

The Astrophysical Journal, 2009
We present a method for extracting the angular diameter distances, $D_A$, and the expansion rates, $H$, of the universe from the {\it two-dimensional} Baryon Acoustic Oscillations (BAO) in the galaxy power spectrum. Our method builds upon the existing algorithm called the "fit-and-extract" (FITEX) method, which allows one to extract only $D_A^2/H$ from
Shoji, Masatoshi, Jeong, Donghui, Komatsu, Eiichiro   +2 more
openaire   +3 more sources

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, EarlyView.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

The relationship between Gas and Galaxies [PDF]

, 2009
We have investigated the 2D 2-point correlation function, ƐAG, between low column density Lya absorbers and galaxies at a redshift z ~ 1 for the first time.
Shone, Allen Maurice
core  

Slowly Rotating Traversable Wormholes Supported by Radially Varying String‐Fluid Matter: From Regular Geometries to Photon Trajectories

Annalen der Physik, Volume 538, Issue 6, June 2026.
This study examines slowly rotating traversable wormholes supported by string fluids whose properties change with radius. The matter smoothly shifts from a de Sitter‐like core to a string‐dominated exterior, producing a regular, horizon‐free spacetime.
A. Errehymy, B. Turimov, Meraj Ali Khan, S. Usanov, Z. Yasakov, Z. Avezmuratova   +5 more
wiley   +1 more source

The nature and origin of disky elliptical galaxies [PDF]

, 2002
The observational trend that disky elliptical galaxies exhibit younger luminosity- weighted ages than boxy ellipticals is investigated. The presence of a possible young stellar disk embedded in these galaxies is explored by comparing kinematics derived ...
McDermid, Richard Morgan
core