Results 81 to 90 of about 210,144 (261)

The THESEUS Space Mission and the Infrared Telescope Calibration Unit

Astronomische Nachrichten, EarlyView.
ABSTRACT The Transient High‐Energy Sky and Early Universe Surveyor (THESEUS) is an ESA M7 mission concept currently in Phase A, designed to exploit gamma‐ray bursts to probe the early Universe while advancing multi‐messenger and time‐domain astrophysics. To achieve its ambitious goals, THESEUS will combine wide‐band x‐ray and gamma‐ray monitors with an
András Péter Joó, Rebeka Gyöngyi Kiss, Lorenzo Amati, Bendegúz Koncz, Örs Detre, Gyula Zilizi, Zsolt Bagoly, István I. Rácz, Sándor Pintér, L. Viktor Tóth   +9 more
wiley   +1 more source

Nihao XIII: Clumpy discs or clumpy light in high-redshift galaxies? [PDF]

, 2016
Many massive star forming disc galaxies in the redshift range 3 to 0.5 are observed to have a clumpy morphology showing giant clumps of size $\sim$1 kpc and masses of about $10^{7}M_{\odot}$ to $10^{10} M_{\odot}$.
T. Buck, A. Macciò, A. Obreja, A. Dutton, R. Dom'inguez-Tenreiro, Gian Luigi Granato Mpia, Nyuad, U. A. D. Madrid, O. A. Trieste   +8 more
semanticscholar   +1 more source

Simulating High-redshift Galaxies: Enhancing UV Luminosity with Star Formation Efficiency and a Top-heavy IMF

The Astrophysical Journal
Recent findings from photometric and spectroscopic JWST surveys have identified examples of high-redshift galaxies at z  ≳ 10. These high- z galaxies appear to form much earlier and exhibit greater UV luminosity than predicted by theoretical work.
Tae Bong Jeong, Myoungwon Jeon, Hyunmi Song, Volker Bromm   +3 more
doaj   +1 more source

An Empirical Consistent Redshift Bias: A Possible Direct Observation of Zwicky’s TL Theory

Particles
Recent advancements have shown tensions between observations and our current understanding of the Universe. Such observations may include the H0 tension and massive galaxies at high redshift that are older than traditional galaxy formation models have ...
Lior Shamir
doaj   +1 more source

The local space density of dwarf galaxies [PDF]

, 1997
We estimate the luminosity function of field galaxies over a range of ten magnitudes (-22 < M_{B_J} < -12 for H_0 = 100 km/s/Mpc) by counting the number of faint APM galaxies around Stromlo-APM redshift survey galaxies at known distance. The faint end of
Babul A., Broadhurst T. J., Jon Loveday, Lorrimer S. J., Loveday J., Maddox S. J., Maddox S. J., Maddox S. J., Maddox S. J., Phillipps S., Saunders W., White S. D. M., Zucca E.   +12 more
core   +4 more sources

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

The distribution of neutral hydrogen around high-redshift galaxies and quasars in the EAGLE simulation [PDF]

, 2015
The observed high covering fractions of neutral hydrogen (HIHI) with column densities above ∼1017 cm−2 around Lyman-Break Galaxies (LBGs) and bright quasars at redshifts z ∼ 2–3 has been identified as a challenge for simulations of galaxy formation.
A. Rahmati, J. Schaye, R. Bower, R. Crain, M. Furlong, M. Schaller, T. Theuns   +6 more
semanticscholar   +1 more source

Beyond No No Tension: JWST z > 10 Galaxies Push Simulations to the Limit

The Open Journal of Astrophysics
JWST has identified some of the Universe's earliest galaxies, repeatedly pushing the frontier to ever higher redshifts and stellar masses. The presence of such extreme galaxies at such early times, with large stellar populations and high star-formation ...
Joe McCaffrey, Samantha Hardin, John Wise, John Regan   +3 more
doaj   +1 more source

Early Results from GLASS-JWST. IX. First Spectroscopic Confirmation of Low-mass Quiescent Galaxies at z > 2 with NIRISS

The Astrophysical Journal Letters, 2023
How passive galaxies form, and the physical mechanisms which prevent star formation over long timescales, are some of the most outstanding questions in understanding galaxy evolution.
Danilo Marchesini, Gabriel Brammer, Takahiro Morishita, Pietro Bergamini, Xin Wang, Marusa Bradac, Guido Roberts-Borsani, Victoria Strait, Tommaso Treu, Adriano Fontana, Tucker Jones, Paola Santini, Benedetta Vulcani, Ana Acebron, Antonello Calabrò, Marco Castellano, Karl Glazebrook, Claudio Grillo, Amata Mercurio, Themiya Nanayakkara, Piero Rosati, Chanita Tubthong, Eros Vanzella   +22 more
doaj   +1 more source

The nature of Long-GRB host galaxies from chemical abundances

, 2010
Gamma-ray bursts (GRBs) are the most energetic events after the Big Bang and they have been observed up to very high redshift. By means of measures of chemical abundances now available for the galaxies hosting such events,thought to originate from the ...
Akerman, Bell, Bissaldi, Boissier, Bradamante, Calura, Calura, Calura, Campisi, Castro Cerón, Cescutti, Chary, Chen, Chiappini, Chiappini, Chisari, Cowie, F. Matteucci, François, Fynbo, Fynbo, Galama, Graham, Greiner, Hjorth, Hou, Iwamoto, J. Yin, Jakobsson, Kistler, Lamb, Lanfranchi, Lapi, Levesque, Levesque, Li, Liang, Mannucci, Mao, Matteucci, Matteucci, Matteucci, Matteucci, Micha▯owski, Møller, Naab, Nuza, Padovani, Pian, Pipino, Pipino, Pipino, Pontzen, Prochaska, Prochaska, Rau, Romano, Romano, Salpeter, Salvaterra, Savaglio, Savaglio, Schmidt, Shapley, Svensson, Tanvir, van den Hoek, Wolf, Wolfe, Woosley, Woosley, Woosley, X. L. Fan, Yin, Yin, Yoon, Zwaan   +76 more
core   +1 more source