Results 41 to 50 of about 4,431 (189)

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

Metal Abundances of KISS Galaxies. III. Nebular Abundances for Fourteen Galaxies and the Luminosity‐Metallicity Relationship for HiiGalaxies [PDF]

The Astrophysical Journal, 2004
36 pages, 5 figures.
Lee, Janice C., Salzer, John J., Melbourne, Jason   +2 more
openaire   +2 more sources

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, EarlyView.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 more
wiley   +1 more source

Chemical abundances of LINER galaxies – nitrogen abundance estimations

Monthly Notices of the Royal Astronomical Society
ABSTRACT In this work, we investigated the nitrogen and oxygen abundances in a sample of galaxies with Low Ionization Nuclear Emission Regions (LINERs) in their nucleus. Optical spectroscopic data (3600 – 10 000 Å) of 40 LINERs from the Mapping Nearby Galaxies (MaNGAs) survey were considered.
C B Oliveira, Â. C. Krabbe, O. L. Dors, I. A. Zinchenko, J. A. Hernández-Jiménez, M. V. Cardaci, G. F. Hägele, Gabriele S Ilha   +7 more
openaire   +3 more sources

The elemental abundance pattern in a galaxy at z = 2.626 [PDF]

Nature, 2003
The discovery of metal-poor stars (where metal is any element more massive than helium) has enabled astronomers to probe the chemical enrichment history of the Milky Way. More recently, element abundances in gas inside high-redshift galaxies has been probed through the absorption lines imprinted on the spectra of background quasars, but these have ...
Prochaska, Jason X., Howk, J. Chris, Wolfe, Arthur M.   +2 more
openaire   +3 more sources

Wekemo Bioincloud 2026: An AI‐enabled platform for standardized multi‐omics data analyses

iMeta, EarlyView.
An AI‐powered multi‐omics cloud platform integrating 41 standardized workflows, 126 visualization tools, and full‐lifecycle research intelligence to enable accessible, reproducible, and end‐to‐end integrative multi‐omics analysis. Abstract The rapid expansion of multi‐omics data has created an increasing demand for accessible and reproducible platforms
Yunyun Gao, Guoxing Zhang, Chengrui Wang, Hao Xu, Zhanhui Yu, Shunyao Jiang, Yong‐Xin Liu   +6 more
wiley   +1 more source

CARBON AND NITROGEN ABUNDANCES IN EARLY-TYPE GALAXIES [PDF]

The Astrophysical Journal, 2009
For the first time, we undertake a systematic examination of the nitrogen abundances for a sample of 35 early-type galaxies spanning a range of masses and local environment. The nitrogen-sensitive molecular feature at 3360Åhas been employed in conjunction with a suite of atomic- and molecular-sensitive indices to provide unique and definitive ...
Toloba, E., Sánchez Blázquez, Patricia, Gorgas García, Francisco Javier, Gibson, B. K.   +3 more
openaire   +3 more sources

The Hubble Constant Anchor Galaxy NGC 4258: Metallicity and Distance from Blue Supergiants

The Astrophysical Journal
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields a central logarithmic metallicity (in units of the solar value) of [ Z ] =
Rolf-Peter Kudritzki, Miguel A. Urbaneja, Fabio Bresolin, Lucas M. Macri, Wenlong Yuan, Siyang Li, Gagandeep S. Anand, Adam G. Riess   +7 more
doaj   +1 more source

Cis–Trans Rotational Isomerism of Formic Acid, Sulfur, and Selenium Analogues and Their Dimers: Chemical Kinetics Under Interstellar Conditions

International Journal of Chemical Kinetics, EarlyView.
ABSTRACT We present chemical kinetic rate constants for the cis to trans isomerisation or rotamerization of monomeric seleno‐, thio‐, and formic acids and that of three of their dimeric species, based on variational transition state theory and multidimensional tunneling calculations in the gas‐phase, from 10 K to 300 K. These provide, firstly, reliable
Judith Wurmel, John M. Simmie
wiley   +1 more source

Evidence for multiple crossings and stripping of Gaia-Enceladus/Sausage across the Milky Way

Astronomy & Astrophysics
Context. The accretion of Gaia-Enceladus/Sausage (GES) onto the Milky Way (MW) is one of the most prominent features of the Galactic halo revealed by the combination of the Gaia satellite and large spectroscopic surveys.
Berni L., Palla M., Magrini L., Spina L.
doaj   +1 more source