Results 51 to 60 of about 31,186 (206)

Gamma‐Ray Burst Prompt Correlations

Advances in Astronomy, Volume 2018, Issue 1, 2018., 2018
The mechanism responsible for the prompt emission of gamma‐ray bursts (GRBs) is still a debated issue. The prompt phase‐related GRB correlations can allow discriminating among the most plausible theoretical models explaining this emission. We present an overview of the observational two‐parameter correlations, their physical interpretations, and their ...
M. G. Dainotti, R. Del Vecchio, M. Tarnopolski, Alberto J. Castro-Tirado   +3 more
wiley   +1 more source

Constraints on the Evolution of the Ionizing Background and Ionizing Photon Mean Free Path at the End of Reionization

The Astrophysical Journal
The variations in Ly α forest opacity observed at z > 5.3 between lines of sight to different background quasars are too strong to be caused by fluctuations in the density field alone.
Frederick B. Davies, Sarah E. I. Bosman, Prakash Gaikwad, Fahad Nasir, Joseph F. Hennawi, George D. Becker, Martin G. Haehnelt, Valentina D’Odorico, Manuela Bischetti, Anna-Christina Eilers, Laura C. Keating, Girish Kulkarni, Samuel Lai, Chiara Mazzucchelli, Yuxiang Qin, Sindhu Satyavolu, Feige Wang, Jinyi Yang, Yongda Zhu   +18 more
doaj   +1 more source

An Exploration of AGN and Stellar Feedback Effects in the Intergalactic Medium via the Low-redshift Lyα Forest

The Astronomical Journal, 2023
We explore the role of galactic feedback on the low-redshift Ly α (Ly α ) forest ( z ≲ 2) statistics and its potential to alter the thermal state of the intergalactic medium. Using the Cosmology and Astrophysics with Machine Learning Simulations (CAMELS)
Megan Taylor Tillman, Blakesley Burkhart, Stephanie Tonnesen, Simeon Bird, Greg L. Bryan, Daniel Anglés-Alcázar, Sultan Hassan, Rachel S. Somerville, Romeel Davé, Federico Marinacci, Lars Hernquist, Mark Vogelsberger   +11 more
doaj   +1 more source

Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade

Radio Science, Volume 60, Issue 7, July 2025.
Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park, J. E. Riedel, N. Rodriguez‐Alvarez, M. Brozovic, L. A. M. Benner, P. Vergados, D. Buccino, C. S. Jacobs, L. S. Locke, S. W. Asmar, R. Castano, T. J. W. Lazio, J. Jao, C. Lee   +13 more
wiley   +1 more source

Cosmic Reionization on Computers: The Evolution of the Ionizing Background and Mean Free Path

The Astrophysical Journal
Observations of the end stages of reionization indicate that at z  ≈ 5–6, the ionizing background is not uniform and the mean free path (MFP) changes drastically.
Jiawen Fan, Huanqing Chen, Camille Avestruz, Affan Khadir   +3 more
doaj   +1 more source

Possible Contamination of the Intergalactic Medium Damping Wing in ULAS J1342+0928 by Proximate Damped Lyα Absorption

The Astrophysical Journal Letters
The red damping wing from neutral hydrogen in the intergalactic medium is a key predicted signature of ongoing reionization. One potential contaminant of the intergalactic damping wing signal is dense gas associated with foreground galaxies, which can ...
Frederick B. Davies, Eduardo Bañados, Joseph F. Hennawi, Sarah E. I. Bosman   +3 more
doaj   +1 more source

Strategy to Explore Magnetized Cosmic Web with Forthcoming Large Surveys of Rotation Measure

Galaxies, 2018
The warm-hot intergalactic medium (WHIM) is a candidate for the missing baryons in the Universe. If the WHIM is permeated with the intergalactic magnetic field (IGMF), the Faraday rotation measure (RM) of the WHIM is imprinted in linearly-polarized ...
Takuya Akahori
doaj   +1 more source

Directly Tracing Cool Filamentary Accretion over >100 kpc into the Interstellar Medium of a Quasar Host at z = 1

The Astrophysical Journal Letters, 2022
We report the discovery of giant (50−100 kpc) [O ii ] emitting nebulae with MUSE in the field of TXS 0206−048, a luminous quasar at z = 1.13. “Down-the-barrel” UV spectra of the quasar show absorption at velocities coincident with those of the extended ...
Sean D. Johnson, Joop Schaye, Gregory L. Walth, Jennifer I-Hsiu Li, Gwen C. Rudie, Hsiao-Wen Chen, Mandy C. Chen, Benoît Epinat, Massimo Gaspari, Sebastiano Cantalupo, Wolfram Kollatschny, Zhuoqi (Will) Liu, Sowgat Muzahid   +12 more
doaj   +1 more source

The baryon density at z=0.9-1.9 - Tracing the warm-hot intergalactic medium with broad Lyman alpha absorption

, 2007
We present an analysis of the Lyman alpha forests of five quasar spectra in the near UV. Properties of the intergalactic medium (IGM) at an intermediate redshift interval (0.9 < z < 1.9) are studied.
Fechner, C., Janknecht, E., Prause, N., Reimers, D.   +3 more
core   +1 more source

Heating of the intergalactic medium due to structure formation [PDF]

, 2001
We estimate the heating of the intergalactic medium due to shocks arising from structure formation. Heating of the gas outside the collapsed regions, with small overdensities (${n_b \over {\bar n_b}}\ll 200$) is considered here, with the aid of Zel ...
Bardeen, Biman B. Nath, Cen, Jones, Joseph Silk, Peacock, Pen, Sunyaev, Zel'Dovich   +8 more
core   +3 more sources