Results 31 to 40 of about 434 (176)

The ultraviolet background (intergalactic gas, the Galaxy, and subcosmic rays) [PDF]

Symposium - International Astronomical Union, 1970
(1)Observations. – A survey is made of observations of the background radiation at UV wavelengths from above the atmosphere. Sources of the background radiation and ways of determining the extragalactic component of the background are discussed. Future observations are also discussed.(2)Cosmology.
V. G. Kurt, R. A. Sunyaev
openaire   +1 more source

Bounds on sterile neutrino lifetime and mixing angle with active neutrinos by global 21 cm signal

Physics Letters B, 2022
Sterile neutrinos can be a possible candidate for dark matter. Sterile neutrinos are radiatively unstable and can inject photon energy into the intergalactic medium (IGM).
Pravin Kumar Natwariya, Alekha C. Nayak
doaj   +1 more source

EIGER. I. A Large Sample of [O iii]-emitting Galaxies at 5.3 < z < 6.9 and Direct Evidence for Local Reionization by Galaxies

The Astrophysical Journal, 2023
We present a first sample of 117 [O iii ] λλ 4960, 5008–selected star-forming galaxies at 5.33 < z < 6.93 detected in JWST/NIRCam 3.5 μ m slitless spectroscopy of a $6\buildrel{\,\prime}\over{.} 5\,\times \,3\buildrel{\,\prime}\over{.} 4$ field centered ...
Daichi Kashino, Simon J. Lilly, Jorryt Matthee, Anna-Christina Eilers, Ruari Mackenzie, Rongmon Bordoloi, Robert A. Simcoe   +6 more
doaj   +1 more source

HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group [PDF]

The Astrophysical Journal, 2001
We report the discovery from the H I Parkes All-Sky Survey (HIPASS) of a gas cloud associated with the asymmetric spiral galaxy NGC 2442. This object, designated HIPASS J0731-69, contains ~109 Msolar of H I, or nearly one-third as much atomic gas as NGC 2442 itself.
Ryder, S. D., Koribalski, B., Staveley-Smith, L., Kilborn, Virginia, Malin, D. F., Banks, G. D., Barnes, D. G., Bhatal, R., De Blok, W. J.G., Boyce, P. J., Disney, M. J., Drinkwater, M. J., Ekers, R. D., Freeman, K. C., Gibson, B. K., Henning, P. A., Jerjen, H., Knezek, P. M., Marquarding, M., Minchin, R. F., Mould, Jeremy, Oosterloo, T., Price, R. M., Putman, M. E., Sadler, E. M., Stewart, I., Stootman, F., Webster, R. L., Wright, A. E.   +28 more
openaire   +4 more sources

The entropy and energy of intergalactic gas in galaxy clusters [PDF]

Monthly Notices of the Royal Astronomical Society, 2000
Studies of the X-ray surface brightness profiles of clusters, coupled with theoretical considerations, suggest that the breaking of self-similarity in the hot gas results from an `entropy floor', established by some heating process, which affects the structure of the intracluster gas strongly in lower mass systems.
Lloyd-Davies, E. J., Ponman, T. J., Cannon, D. B.   +2 more
openaire   +2 more sources

Estimation of the detected background by the future gamma ray transient mission CAMELOT

Astronomische Nachrichten, Volume 340, Issue 7, Page 666-673, August 2019., 2019
Abstract This study presents a background estimation for the CubeSats Applied for MEasuring and LOcalising Transients (CAMELOT), which is a proposed fleet of nanosatellites for the all‐sky monitoring and timing‐based localization of gamma ray transients with precise localization capability at low Earth orbits.
Jakub Řípa, Gábor Galgóczi, Norbert Werner, András Pál, Masanori Ohno, László Mészáros, Tsunefumi Mizuno, Norbert Tarcai, Kento Torigoe, Nagomi Uchida, Yasushi Fukazawa, Hiromitsu Takahashi, Kazuhiro Nakazawa, Naoyoshi Hirade, Kengo Hirose, Syohei Hisadomi, Teruaki Enoto, Hirokazu Odaka, Yuto Ichinohe, Zsolt Frei, László Kiss   +20 more
wiley   +1 more source

The Fractal Geometry of the Cosmic Web and Its Formation

Advances in Astronomy, Volume 2019, Issue 1, 2019., 2019
The cosmic web structure is studied with the concepts and methods of fractal geometry, employing the adhesion model of cosmological dynamics as a basic reference. The structures of matter clusters and cosmic voids in cosmological N‐body simulations or the Sloan Digital Sky Survey are elucidated by means of multifractal geometry.
Jose Gaite, Geza Kovacs
wiley   +1 more source

The Natural Science Underlying Big History

The Scientific World Journal, Volume 2014, Issue 1, 2014., 2014
Nature’s many varied complex systems—including galaxies, stars, planets, life, and society—are islands of order within the increasingly disordered Universe. All organized systems are subject to physical, biological, or cultural evolution, which together comprise the grander interdisciplinary subject of cosmic evolution.
Eric J. Chaisson, Lukas Kratochvil
wiley   +1 more source

Numerical Relativity as a Tool for Studying the Early Universe

Journal of Gravity, Volume 2014, Issue 1, 2014., 2014
Numerical simulations are becoming a more effective tool for conducting detailed investigations into the evolution of our universe. In this paper, we show how the framework of numerical relativity can be used for studying cosmological models. The author is working to develop a large‐scale simulation of the dynamical processes in the early universe ...
David Garrison, Sergey D. Odintsov
wiley   +1 more source

Outer Ionized Gas in Galaxy Group: Exchance Through Tidal Interaction or Accretion from Common Reservoirs?

Universe
To clarify the problem of outer cold gas accretion onto disk galaxies, we performed the panoramic spectroscopy of six compact galaxy groups to search for intergalactic gas flows.
Olga Sil’chenko, Alexei Moiseev, Alexandrina Smirnova, Yael Kosareva, Dmitry Oparin   +4 more
doaj   +1 more source