Results 51 to 60 of about 210 (157)

Impact of Sudden Stratospheric Warming and Elevated Stratopause Events on the Very Low Frequency Radio Signal

Journal of Geophysical Research: Space Physics, Volume 130, Issue 3, March 2025.
Abstract Sudden Stratospheric Warmings (SSW) and Elevated Stratopause (ES) events are mid‐to‐high latitudinal, atmospheric wave‐driven phenomena leading to significant changes in wind, temperatures, and vertical mass transport, especially at stratospheric and mesospheric altitudes.
H. Schneider, V. Wendt, D. Banyś, M. Hansen, M. Clilverd, P. T. Verronen   +5 more
wiley   +1 more source

Lyman-alpha absorbers arising in galaxy clusters

, 1997
2 pages, 2 figures, to appear in the proceedings of the 13th IAP Conference on "Evolution of the Intergalactic Medium From QSO Absorption Line Systems"
Ortiz-Gil, A., Lanzetta, K. M., Webb, J. K., Barcons, X.   +3 more
openaire   +2 more sources

Das zirkumgalaktische Medium

Physik in unserer Zeit, Volume 56, Issue 1, Page 30-37, January 2025.
Galaxien wie die Milchstraße sind umhüllt von einem gigantischen Kokon aus diffusem Gas. Aktuelle Forschungsergebnisse belegen, dass dieses zirkumgalakische Medium eine entscheidende Rolle für die Entstehung und Entwicklung von Galaxien spielt. Zusammenfassung Als zirkumgalaktisches Medium bezeichnet man die gasförmigen Hüllen von Galaxien, die sich ...
Philipp Richter
wiley   +1 more source

A High Rate of Foreground Contaminants toward High-redshift Galaxies Resolved by JWST

The Astrophysical Journal
We present a study of high-redshift Ly α emitters (LAEs) with multiple components using the Hubble Space Telescope and JWST. High-redshift galaxies are mostly point-like objects on ground-based images, but they often exhibit multiple components in higher
Weiyang Liu, Linhua Jiang
doaj   +1 more source

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 Galaxy Proximity Effect in the Lyman-alpha Forest

, 2002
Hydrodynamic cosmological simulations predict that the average opacity of the Ly-alpha forest should increase in the neighborhood of galaxies because galaxies form in dense environments. Recent observations (Adelberger et al. 2002) confirm this expectation at large scales, but they show a decrease of absorption at comoving separations Delta_r ~ 1 Mpc/h
Kollmeier, Juna A., Weinberg, David H., Dave', Romeel, Katz, Neal   +3 more
openaire   +2 more sources

ODIN: Rest-frame Optical Morphologies and Star Formation Activity of Lyα Emitters at z = 2.4, 3.1, and 4.5

The Astrophysical Journal
We analyze the rest-frame optical (∼8000 Å) morphologies and star formation activity of Ly α emitters (LAEs) at redshifts 2.4, 3.1, and 4.5, identified in the One-hundred-deg ^2 DECam Imaging in Narrowband (ODIN) survey.
Sang Hyeok Im, Ho Seong Hwang, Jeong Hwan Lee, Robin Ciardullo, Eric Gawiser, Caryl Gronwall, Lucia Guaita, Woong-Seob Jeong, Ankit Kumar, Kyoung-Soo Lee, Changbom Park, Vandana Ramakrishnan, Akriti Singh, Hyunmi Song, Sungryong Hong, Juhan Kim, Jaehyun Lee, Christophe Pichon, Caitlin M. Casey, Maximilien Franco, Santosh Harish, Jeyhan S. Kartaltepe   +21 more
doaj   +1 more source

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

Lyman-alpha absorption around nearby galaxies

, 2002
We have used STIS aboard HST to search for Lyman-alpha (Lya) absorption lines in the outer regions of eight nearby galaxies using background QSOs and AGN as probes. Lya lines are detected within a few hundred km/s of the systemic velocity of the galaxy in all cases.
Bowen, David V., Pettini, Max, Blades, J. Chris   +2 more
openaire   +2 more sources

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