Results 1 to 10 of about 91,143 (269)

Evidence of violation of case B recombination in little red dots

Astronomy & Astrophysics
Context. Little Red Dots (LRDs) are a new class of compact extragalactic objects with a v-shaped optical spectral energy distribution breaking close to the Balmer break wavelength and broad, typically exponentially shaped lines.
Nikopoulos G. P., Watson D., Sneppen A., Rusakov V., Heintz K. E., Witstok J., Brammer G.   +6 more
doaj   +1 more source

Novel z ∼ 10 auroral line measurements extend the gradual offset of the fundamental metallicity relation deep into the first gigayear of cosmic time

Astronomy & Astrophysics
The mass assembly and chemical enrichment of the first galaxies provide key insights into their star formation histories and the earliest stellar populations at cosmic dawn.
Pollock Clara L., Gottumukkala Rashmi, Heintz Kasper E., Brammer Gabriel B., Roberts-Borsani Guido, Oesch Pascal A., Witstok Joris, Arellano-Córdova Karla Z., Cullen Fergus, Scholte Dirk, Terp Chamilla, Rowland Lucie, Sneppen Albert, Ito Kei, Valentino Francesco, Matthee Jorryt, Watson Darach, Toft Sune   +17 more
doaj   +1 more source

On the dusty proximate damped Lyman-α system toward Q 2310−3358 at z = 2.40

Astronomy & Astrophysics
Quasar absorption systems not only affect the way quasars are selected, but also serve as key probes of galaxies, providing insight into their chemical evolution and interstellar medium (ISM). Recently, a method based on Gaia astrometric measurements has
Han S., Krogager J.-K., Ledoux C., Ma G., Heintz K. E., Geier S. J., Christensen L., Møller P., Fynbo J. P. U.   +8 more
doaj   +1 more source

Multi-instrument observations of ionospheric super plasma bubbles in the European longitude sector during the 23–24 April 2023 severe geomagnetic storm

Journal of Space Weather and Space Climate
This study’s objective is to better specify the rare occurrence of super equatorial plasma bubbles in particular to the European longitude sector, detailing their spatio-temporal evolution, and better understanding pre-conditions for their development ...
Zakharenkova Irina, Cherniak Iurii, Braun John J., Wu Qian, Sokolovskiy Sergey, Hunt Douglas, Weiss Jan-Peter   +6 more
doaj   +1 more source

“Cosmic Dust” [PDF]

Nature, 1883
n ...
openaire   +1 more source

Cosmic Vine: High abundance of massive galaxies and dark matter halos in a forming cluster at z = 3.44

Astronomy & Astrophysics
The Cosmic Vine is a massive protocluster at z = 3.44 in the JWST CEERS field, offering an ideal laboratory for studying the early phases of cluster formation.
Sillassen Nikolaj B., Jin Shuowen, Magdis Georgios E., Valentino Francesco, Daddi Emanuele, Gobat Raphael, Brinch Malte, Ito Kei, Wang Tao, Sun Hanwen, Brammer Gabriel, Toft Sune, Greve Thomas R.   +12 more
doaj   +1 more source

Comparison of global observations and trends of total precipitable water derived from microwave radiometers and COSMIC radio occultation from 2006 to 2013 [PDF]

Atmospheric Chemistry and Physics, 2018
We compare atmospheric total precipitable water (TPW) derived from the SSM/I (Special Sensor Microwave Imager) and SSMIS (Special Sensor Microwave Imager/Sounder) radiometers and WindSat to collocated TPW estimates derived from COSMIC (Constellation ...
S.-P. Ho, L. Peng, C. Mears, R. A. Anthes   +3 more
doaj   +1 more source

Cosmic rulers [PDF]

Physical Review D, 2012
We derive general covariant expressions for the six independent observable modes of distortion of ideal standard rulers in a perturbed Friedmann-Robertson-Walker spacetime. Our expressions are gauge-invariant and valid on the full sky. These six modes are most naturally classified in terms of their rotational properties on the sphere, yielding two ...
Schmidt, Fabian, Jeong, Donghui
openaire   +3 more sources

Ground strains induced by the 2022 Hunga-Tonga volcanic eruption, observed by a 1500-m laser strainmeter at Kamioka, Japan

Earth, Planets and Space, 2023
In this study, we detected the horizontal ground strains induced by the atmospheric Lamb wave emitted from the 2022 eruption of the Tonga–Hunga Ha’apai undersea volcano, at an underground observatory in Kamioka, Japan.
Akiteru Takamori, Akito Araya, Kouseki Miyo, Tatsuki Washimi, Takaaki Yokozawa, Hideaki Hayakawa, Masatake Ohashi   +6 more
doaj   +1 more source

Cosmic jets [PDF]

Physics Letters A, 2011
We discuss time-dependent gravitational fields that "accelerate" free test particles to the speed of light resulting in cosmic double-jet configurations. It turns out that complete gravitational collapse along a spatial axis together with corresponding expansion along the other two axes leads to the accelerated motion of free test particles up and down
Chicone, C., Mashhoon, B., Rosquist, K.
openaire   +3 more sources