Results 81 to 90 of about 8,408 (187)

Why Does the October Effect Not Occur at Night?

Geophysical Research Letters, Volume 51, Issue 7, 16 April 2024.
Abstract The October effect is known as a rapid and strong decrease in the signal amplitude of radio waves with very low frequency (VLF), reflected at the lowest edge of the ionosphere. This strong decrease can be observed only during the daytime. Although the October effect is long known, it is hardly investigated and its mechanism is still unknown ...
Vivien Wendt, Helen Schneider, Daniela Banyś, Marc Hansen, Mark A. Clilverd, Tero Raita   +5 more
wiley   +1 more source

The Size Evolution and the Size–Mass Relation of Lyα Emitters across 3 ≲ z< 7 as Observed by JWST

The Astrophysical Journal
Understanding the morphological structures of Ly α emitters (LAEs) is crucial for unveiling their formation pathways and the physical origins of Ly α emission. However, the evolution of their sizes and structural scaling relations remains debated.
Qi Song, F. S. Liu, Jian Ren, Pinsong Zhao, Qifan Cui, Yubin Li, Hao Mo, Yuchong Luo, Guanghuan Wang, Nan Li, Hassen M. Yesuf, Weichen Wang, Xin Zhang, Xianmin Meng, Mingxiang Fu, Bingqing Zhang, Chenxiaoji Ling   +16 more
doaj   +1 more source

The cool side of Lyman Alpha Emitters

, 2009
We extend a previous study of Lyman Alpha Emitters (LAEs) based on hydrodynamical cosmological simulations, by including two physical processes important for LAEs: (a) Lyman Alpha and continuum luminosities produced by cooling of collisionally excited HI
Alexandro Saro, Anderson, Andrea Ferrara, Atek, Atek, Bianchi, Bolton, Cen, Dawson, Dayal, Deharveng, Dijkstra, Dijkstra, Dijkstra, Dijkstra, Dwek, Ferrara, Finkelstein, Gallerani, Gnedin, Gronwall, Haardt, Hansen, Kashikawa, Kobayashi, Komatsu, Lai, Leitherer, Lisenfeld, Maiolino, Mao, McKee, McQuade, McQuinn, Mori, Mori, Murayama, Neufeld, Nozawa, Nozawa, Osterbrock, Ouchi, Padovani, Pratika Dayal, Salpeter, Santos, Saro, Seab, Seaton, Shimasaku, Spitzer, Springel, Springel, Springel, Storchi-Bergmann, Stratta, Todini, Tornatore, Valiante, van den Hoek, Verhamme, Woosley   +61 more
core   +1 more source

The nature of the Lyman-alpha emission region of FDF-4691 [PDF]

, 2004
In order to study the origin of the strong Lyman-alpha emission of high-redshift starburst galaxies we observed and modeled the emission of the z = 3.304 galaxy FDF-4691 (rest-frame EW = 103 Angstroem).
Ahn, Ahn, Bouchet, C. Tapken, Calzetti, Charlot, D. Mehlert, Dawson, Heidt, Hu, I. Appenzeller, Kennicutt, Kudritzki, Kunth, Leitherer, Mas-Hesse, Mehlert, Meinköhn, Neufeld, Rhoads, Richling, S. Noll, S. Richling, Shapley, Taniguchi, Tenorio-Tagle, Van Ojik, Walborn   +27 more
core   +2 more sources

EMM EMUS Observations of Hot Oxygen Corona at Mars: Radial Distribution and Temporal Variability

Journal of Geophysical Research: Space Physics, Volume 129, Issue 3, March 2024.
Abstract We present the first observations of the dayside coronal oxygen emission in far ultraviolet (FUV) measured by the Emirates Mars Ultraviolet Spectrometer (EMUS) onboard the Emirates Mars Mission (EMM). The high sensitivity of EMUS is providing an opportunity to observe the tenuous oxygen corona in FUV, which is otherwise difficult to observe ...
Krishnaprasad Chirakkil, Justin Deighan, Michael S. Chaffin, Sonal K. Jain, Robert J. Lillis, Susarla Raghuram, Greg Holsclaw, David A. Brain, Ed Thiemann, Phil Chamberlin, Matthew O. Fillingim, J. Scott Evans, Scott England, Hessa AlMatroushi, Hoor AlMazmi, Frank Eparvier, Marko Gacesa, Nayla El‐Kork, Shannon M. Curry   +18 more
wiley   +1 more source

A Spectral Atlas of Lyα Emitters at z = 5.7 and z = 6.6

The Astrophysical Journal
We present two uniformly observed spectroscopic samples of Ly α emitters (LAEs; 127 at z = 5.7 and 82 at z = 6.6), which we use to investigate the evolution of the LAE population at these redshifts.
A. Songaila, L. L. Cowie, A. J. Barger, E. M. Hu, A. J. Taylor   +4 more
doaj   +1 more source

Trident: A three-pronged galaxy survey. I. Lyman alpha emitting galaxies at z~2 in GOODS North

, 2015
Context. Lyman alpha emitting galaxies (LAEs) are used to probe the distant universe and are therefore important for galaxy evolution studies and for providing clues to the nature of the epoch of reionization, but the exact circumstances under which ...
Guaita, L., Hayes, M., Kiaeerad, F., Sandberg, A., Östlin, G.   +4 more
core   +1 more source

The HETDEX Pilot Survey III: The Low Metallicities of High-Redshift Lyman Alpha Galaxies [PDF]

, 2011
We present Keck/NIRSPEC spectroscopic observations of three Lyman alpha emitting galaxies (LAEs) at z ~ 2.3 discovered with the HETDEX pilot survey. We detect Halpha, [OIII], and Hbeta emission from two galaxies at z = 2.29 and 2.49, designated HPS194 ...
Adams, Blanc, Calzetti, Caryl Gronwall, Casey Papovich, Cowie, Cowie, Donald P. Schneider, Donley, Erb, Erb, Eric Gawiser, Finkelstein, Finkelstein, Finkelstein, Finkelstein, Finkelstein, Finkelstein, Finkelstein, Finkelstein, Finkelstein, Förster Schreiber, Gary J. Hill, Gawiser, Gawiser, González, Gronwall, Guaita, Guillermo A. Blanc, Hainline, Hill, Huang, Joshua Adams, Karl Gebhardt, Kewley, Kim-Vy Tran, Kobulnicky, Kurucz, Labbé, Lai, Lai, Laursen, Liu, Malhotra, Malkan, Martin, McLinden, Nilsson, Niv Drory, Ono, Osterbrock, Ouchi, Ouchi, Overzier, Papovich, Pettini, Pirzkal, Puccetti, Reddy, Reddy, Rhoads, Richards, Robin Ciardullo, Rupke, Sanders, Sawicki, Scarlata, Scoville, Shapley, Shapley, Shapley, Silverman, Stark, Steidel, Steidel, Stern, Steven L. Finkelstein, Teplitz, Tremonti, Wang, Watson, Yan, Yan, York, Yuma, Zheng, Östlin   +86 more
core   +1 more source

Metallicity Evolution of Damped Lyman-Alpha Galaxies

, 2002
We have reanalyzed the existing data on Zinc abundances in damped Ly-alpha (DLA) absorbers to investigate whether their mean metallicity evolves with time. Most models of cosmic chemical evolution predict that the mass- weighted mean interstellar metallicity of galaxies should rise with time from a low value ~ 1/30 solar at z ~ 3 to a nearly solar ...
Kulkarni, Varsha P., Fall, S. Michael
openaire   +2 more sources

Measuring the Quantum State of Dark Matter

Annalen der Physik, Volume 536, Issue 1, January 2024.
It is demonstrated how the time series obtained from searches for ultralight bosonic dark matter, such as the axion, can be used to determine whether it is in a coherent or incoherent quantum state. Abstract It is shown how the time series obtained from searches for ultralight bosonic dark matter (DM), such as the axion, can be used to determine ...
David J. E. Marsh
wiley   +1 more source