Results 51 to 60 of about 182 (139)

Lyman Alpha and MgII as Probes of Galaxies and their Environments

, 2014
Lyα emission, Lyα absorption and MgII absorption are powerful tracers of neutral hydrogen. Hydrogen is the most abundant element in the universe and plays a central role in galaxy formation via gas accretion and outflows, as well as being the precursor to molecular clouds, the sites of star formation.
Barnes, Luke A., Garel, Thibault, Kacprzak, Glenn G.   +2 more
openaire   +2 more sources

The galaxy-IGM connection in THESAN: the physics connecting the IGM Lyman-$α$ opacity and galaxy density in the reionization epoch

The Open Journal of Astrophysics
The relation between the Lyman-$\alpha$ effective optical depth of quasar sightlines ($\tau_\mathrm{los}$) and the distribution of galaxies around them is an emerging probe of the connection between the first collapsed structures and the IGM properties ...
Enrico Garaldi, Verena Bellscheidt, Aaron Smith, Rahul Kannan   +3 more
doaj   +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

A Nitrogen-rich AGN Powering a Large Ionizing Bubble at z = 8.63

The Astrophysical Journal
We report the detection of Ly α in CANUCS-LRD-z8.6, a recently discovered active galactic nucleus (AGN) at z = 8.63 by R. Tripodi et al. ( 2025 ), in new NIRSpec/MSA G140H/F070LP observations.
Takahiro Morishita, Massimo Stiavelli, Charlotte A. Mason, Roberta Tripodi, Marco Chiaberge, Stefan Schuldt, Chris J. Willott, Yechi Zhang   +7 more
doaj   +1 more source

Lyman Break Galaxies and the Lyman-alpha Forest

, 2002
We use hydrodynamic simulations to predict correlations between Lya forest absorption and galaxies at redshift z~3. The probability distribution function (PDF) of Lya flux decrements shifts systematically towards higher values in the vicinity of galaxies, reflecting the overdense environments in which these galaxies reside. The predicted signal remains
Kollmeier, Juna A., Weinberg, David H., Dave', Romeel, Katz, Neal   +3 more
openaire   +2 more sources

The Lyα Halos of Galaxies at z ≈ 2–3 in the Keck Baryonic Structure Survey

The Astrophysical Journal
We present the large-scale spatial Ly α profiles of galaxies from the Keck Baryonic Structure Survey (KBSS) at 2 
Ryan F. Trainor, Noah R. Lamb, Charles C. Steidel, Yuguang Chen, Dawn K. Erb, Elizabeth Trenholm, Rebecca L. McClain, Io Kovach   +7 more
doaj   +1 more source

Lyman alpha emission in high-redshift galaxies

, 2007
A significant fraction of the high-redshift galaxies show strong Lyman emission lines. For redshifts z>5, most known galaxies belong to this class. However, so far not much is known about the physical structure and nature of these objects. Our aim is to analyse the Lyman alpha emission in a sample of high-redshift UV-continuum selected galaxies and ...
Tapken, C., Appenzeller, I., Noll, S., Richling, S., Heidt, J., Meinkoehn, E., Mehlert, D.   +6 more
openaire   +2 more sources

Escape Fractions from Unattenuated Lyα Emitters around Luminous z > 6 Quasars

The Astrophysical Journal Letters
Ionized proximity zones around luminous quasars provide a unique laboratory to characterize the Ly α emission lines from z  > 6 galaxies without significant attenuation from the intergalactic medium (IGM).
Minghao Yue, Anna-Christina Eilers, Jorryt Matthee, Rohan P. Naidu, Rongmon Bordoloi, Frederick B. Davies, Joseph F. Hennawi, Daichi Kashino, Ruari Mackenzie, Robert A. Simcoe   +9 more
doaj   +1 more source

ODIN: Probing the LAE Lyα Luminosity Function across Cosmic Time and Different Environments

The Astrophysical Journal
The ubiquity and relative ease of discovery make 2 ≲  z  ≲ 5 Ly α emitting galaxies (LAEs) ideal tracers for large-scale structure of the distant Universe.
Gautam Nagaraj, Robin Ciardullo, Caryl Gronwall, Vandana Ramakrishnan, Kyoung-Soo Lee, Eric Gawiser, Nicole Firestone, Govind Ramgopal, J. Aguilar, S. Ahlen, D. Bianchi, D. Brooks, F. J. Castander, T. Claybaugh, A. Cuceu, A. de la Macorra, Arjun Dey, Biprateep Dey, P. Doel, J. E. Forero-Romero, E. Gaztañaga, S. Gontcho A Gontcho, G. Gutierrez, H. K. Herrera-Alcantar, K. Honscheid, M. Ishak, R. Kehoe, D. Kirkby, T. Kisner, A. Kremin, M. Landriau, L. Le Guillou, M. E. Levi, C. Magneville, M. Manera, P. Martini, A. Meisner, R. Miquel, J. Moustakas, N. Palanque-Delabrouille, F. Prada, I. Pérez-Ràfols, G. Rossi, L. Samushia, E. Sanchez, D. Schlegel, M. Schubnell, H. Seo, J. Silber, D. Sprayberry, G. Tarlé, F. Valdes, B. A. Weaver, M. White, R. Zhou, H. Zou   +55 more
doaj   +1 more source

The Sunburst Arc with JWST. IV. The Importance of Interaction, Turbulence, and Feedback for Lyman-continuum Escape

The Astrophysical Journal
At present, the best opportunity for detailed Lyman continuum (LyC) escape studies is in gravitationally lensed galaxies at z  ≳ 2. Only one such galaxy currently exists in the literature with sufficient magnification and spatial resolution: the Sunburst
T. Emil Rivera-Thorsen, Brian Welch, Taylor Hutchison, Matthew J. Hayes, Jane R. Rigby, Keunho Kim, Suhyeon Choe, Michael Florian, Matthew B. Bayliss, Gourav Khullar, Keren Sharon, Håkon Dahle, John Chisholm, Erik Solhaug, M. Riley Owens, Michael D. Gladders   +15 more
doaj   +1 more source