Results 51 to 60 of about 218 (186)
Are There Local Analogs of Lyman Break Galaxies? [PDF]
, 2005 4 pages, 4 figures. To appear in "Starbursts: from 30 Doradus to Lyman Break Galaxies" 2005, eds. R. de Grijs and R. M. Gonzalez Delgado (Kluwer)
Lowenthal, James D. +6 more
openaire +2 more sources
The Astrophysical JournalWe report the discovery of two z ∼ 12 galaxy candidates with unusually red UV slopes ( β _UV ≳ −1.5), and probe the origin of such colors at cosmic dawn.
Ikki Mitsuhashi +21 more
doaj +1 more source
Space Weather, Volume 23, Issue 11, November 2025.Abstract A new daily composite of the solar flare index (SFI) and the hemispherically‐resolved versions (hSFI) are presented for 1937 to 2024. The data set confirms that the northern hemisphere (NH) dominated solar flare activity during Solar Cycles 17 to 21, but that the southern hemisphere has dominated from Solar Cycle 22 to present.
V. M. Velasco Herrera +14 more
wiley +1 more source
Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 This paper is a review on the observational Hubble parameter data that have gained increasing attention in recent years for their illuminating power on the dark side of the universe: the dark matter, dark energy, and the dark age. Currently, there are two major methods of independent observational H(z) measurement, which we summarize as the ...
Tong-Jie Zhang +3 more
wiley +1 more source
The nature of Lyman-break galaxies
, 1998 10 pages, latex, including 2 figures, to appear in the Proceedings of the 3rd International Symposium on Sources and Detection of Dark Matter in the Universe (DM98), Feb. 1998, ed.
Primack, Joel R. +3 more
openaire +2 more sources
The Astrophysical JournalWe present a study of a sample of 45 spectroscopically confirmed, UV luminous galaxies at z ∼ 6. They were selected as bright Lyman-break galaxies (LBGs) using deep multiband optical images in more than 2 deg ^2 of the sky, and subsequently identified ...
Shuqi Fu +4 more
doaj +1 more source
Astronomy & AstrophysicsContext. JWST provides a unique dataset for studying the earliest stages of reionisation at z > 9, promising insights into the first galaxies. Many JWST/NIRSpec prism spectra of z > 5 galaxies have revealed smooth Lyman-alpha breaks, implying damping ...
Mason Charlotte A. +5 more
doaj +1 more source
Two Micron‐Size Dark Dimensions
Fortschritte der Physik, Volume 73, Issue 8, August 2025.Abstract Two extra dimensions of micron scale might simultaneously address the gauge and cosmological hierarchy problems. In this paper various observational bounds in scenarios with one and two large extra dimensions are examined, to see if they are compatible with the micron scale.
Luis A. Anchordoqui +2 more
wiley +1 more source
The First Galaxies and the Likely Discovery of Their Fossils in the Local Group
Advances in Astronomy, Volume 2010, Issue 1, 2010., 2010 The lower bound for the mass of a galaxy is unknown, as are the typical luminosity of the smallest galaxies and their numbers. The answers depend on the extent to which star formation in the first population of small mass halos may be suppressed by radiative feedback loops.
Massimo Ricotti, Andrey V. Kravtsov
wiley +1 more source
Do Local Analogs of Lyman Break Galaxies Exist? [PDF]
The Astrophysical Journal, 2007 The optical properties of a number of supercompact ultraviolet luminous galaxies (UVLG), recently discovered in the local Universe matching GALEX and Sloan Digital Sky Survey (SDSS) data, are discussed. Detailed re-analysis of the SDSS data for these and other similar but nearer galaxies shows that their surface brightness radial profile in both R and ...
Scarpa, Riccardo +2 more
openaire +2 more sources