Results 51 to 60 of about 8,408 (187)

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

Lya escape from z~0.03 star-forming galaxies: the dominant role of outflows

, 2013
The usefulness of H I Lyman-alpha photons for characterizing star formation in the distant universe is limited by our understanding of the astrophysical processes that regulate their escape from galaxies.
Leitherer, C., Salzer, J., Wofford, A.
core   +1 more source

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, EarlyView.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

Constraints on the z ∼ 5 Star-forming Galaxy Luminosity Function From Hubble Space Telescope Imaging of an Unbiased and Complete Sample of Long Gamma-Ray Burst Host Galaxies

The Astrophysical Journal
We present rest-frame UV Hubble Space Telescope imaging of the largest and most complete sample of 23 long-duration gamma-ray burst (GRB) host galaxies between redshifts 4 and 6.
Huei Sears, Ryan Chornock, Jay Strader, Daniel A. Perley, Peter K. Blanchard, Raffaella Margutti, Nial R. Tanvir   +6 more
doaj   +1 more source

Gas Accretion and Giant Lyman-alpha Nebulae

, 2016
Several decades of observations and discoveries have shown that high-redshift AGN and massive galaxies are often surrounded by giant Lyman-alpha nebulae extending in some cases up to 500 kpc in size.
A. Basu-Zych, A. Bunker, A. Dekel, A. Dey, A. Humphrey, A. Humphrey, A. Humphrey, A. Humphrey, B. P. Venemans, C. C. Steidel, C. C. Steidel, C. C. Steidel, C. C. Steidel, C. Leitherer, C. Scarlata, C.-A. Faucher-Giguère, D. C. Martin, D. C. Martin, D. E. Osterbrock, D. J. B. Smith, D. P. Schneider, E. Borisova, E. C. Herenz, E. Lusso, E. M. Hu, E. M. Hu, F. Arrigoni Battaia, F. Arrigoni Battaia, F. Courbin, F. Valentino, H. J. A. Röttgering, J. A. Kollmeier, J. Bergeron, J. Bergeron, J. D. Kurk, J. E. Geach, J. E. Geach, J. F. Hennawi, J. F. Hennawi, J. G. Baker, J. Rosdahl, J. W. Fried, J. X. Prochaska, K. K. Nilsson, L. Christensen, L. Pentericci, L. Wisotzki, M. A. Fardal, M. Beck, M. Dijkstra, M. Dijkstra, M. Fumagalli, M. Hayes, M. K. M. Prescott, M. K. M. Prescott, M. K. M. Prescott, M. K. M. Prescott, M. Reuland, M. Trebitsch, M. Villar-Martín, M. Villar-Martín, M. Weidinger, M. Weidinger, N. K. Hine, N. P. H. Nesvadba, N. P. H. Nesvadba, N. Roche, P. D. Barthel, P. J. Francis, P. J. Francis, P. J. McCarthy, P. J. McCarthy, P. J. McCarthy, P. J. McCarthy, P. L. North, P. Møller, P. Palunas, R. A. Overzier, R. Antonucci, R. Antonucci, R. F. Trainor, R. Ojik van, R. Ojik van, S. A. Eales, S. C. Chapman, S. C. Chapman, S. Cantalupo, S. Cantalupo, S. Cantalupo, S. Cantalupo, S. Cantalupo, S. Djorgovski, S. F. Sánchez, S. J. Lilly, S. R. Furlanetto, S. Veilleux, T. Goerdt, T. M. Heckman, T. Saito, W. C. Keel, Y. Ao, Y. Matsuda, Y. Matsuda, Y. Shen, Y. Taniguchi, Y. Ueda, Y. Yang, Y. Yang, Z. Haiman   +108 more
core   +1 more source

The redshift evolution of bias and baryonic matter distribution [PDF]

, 2000
We study the distribution of baryonic and luminous matter within the framework of a hierarchical scenario. Using an analytical model for structure formation which has already been checked against observations for galaxies, Lyman-$\alpha$ clouds, clusters
Adelberger, Balian, Bardeen, Baugh, Baugh, Benoist, Benson, Benson, Bernardeau, Bernardeau, Bernardeau, Borgani, Bouchet, Colombi, Colombi, Colombi, Colombi, Croft, Davis, Fukugita, J. Silk, Kauffmann, La Franca, Le Fevre, Loveday, Magliocchetti, Mo, Munshi, Munshi, Munshi, P. Valageas, Peacock, Pearce, Peebles, Ponman, Postman, Press, R. Schaeffer, Schaeffer, Schaeffer, Schaeffer, Stephens, Valageas, Valageas, Valageas, Valageas, Valageas, Valageas, Valageas, Valageas, Willmer   +50 more
core   +3 more sources

Logarithmic and Strong Coupling Models in Weyl‐Type f(Q,T)$f(Q,T)$ Gravity

Annalen der Physik, Volume 538, Issue 1, January 2026.
This work explores Weyl‐type f(Q,T) gravity using recent observational datasets — CC, Pantheon+, Union 3.0, and DESI DR2. Through MCMC analysis of logarithmic and strong coupling models, the study reveals a transition from deceleration to acceleration, quintessence‐to‐phantom dynamics, and late‐time consistency with LCDM, offering a geometry‐driven ...
Rahul Bhagat, S. K. Tripathy, B. Mishra
wiley   +1 more source

Constraints on the z  ∼  6−13 intergalactic medium from JWST spectroscopy of Lyman-alpha damping wings in galaxies

Astronomy & Astrophysics
Context. 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., Chen Zuyi, Stark Daniel P., Yi Lu Ting, Topping Michael, Tang Mengtao   +5 more
doaj   +1 more source

The interstellar medium and feedback in the progenitors of the compact passive galaxies at z~2 [PDF]

, 2014
Quenched galaxies at z>2 are nearly all very compact relative to z~0, suggesting a physical connection between high stellar density and efficient, rapid cessation of star-formation.
Bell, Eric F., Cassata, Paolo, Castellano, Marco, Dekel, Avishai, Ferguson, Henry C., Finkelstein, Steven L., Fontana, Adriano, Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman, Guo, Yicheng, Kocevski, Dale, Koekemoer, Anton, Koo, David C., Lee, Bomee, Lee, Kyoung-Soo, Lucas, Ray A., Mobasher, Bahram, Nayyeri, Hooshang, Pentericci, Laura, Ravindranath, Swara, Santini, Paola, Trump, Jonathan R., Tundo, Elena, Vanzella, Eros, Weiner, Benjamin J., Williams, Christina C.   +26 more
core   +2 more sources

Approximation of Daily AMS‐02 Spectra With Machine Learning Methods

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 4, December 2025.
Abstract Almost three thousand daily AMS‐02 proton spectra from 2011 to 2019 offer the most precise and extensive data set of cosmic ray spectra covering a wide energy range. As such, they offer a unique opportunity to test machine learning algorithms for approximating cosmic ray proton spectra based on the inputs usually available to solar modulation ...
Martin Nguyen, Pavol Bobík, Ján Genči
wiley   +1 more source