13 papers · ranked by Valyu relevance
William d’Assignies D., H. Hildebrandt, Dustin Lang
- 1 Université Paris-Saclay, CEA, IRFU, 91191 Gif-sur-Yvette, France - IFAE, The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra Barcelona, Spain - 3 Ruhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute, GCCL, 44780 Bochum, Germany - 4 Perimeter Institute for…
Nadara Hudson, Ryan Endsley, John D. Chisholm
JWST continues to reveal an astonishing number of massive quiescent galaxies at z > 4, with number densities ≳ 10× higher than model predictions. NIRSpec spectra imply that many of these systems underwent intense starburst episodes (SFR ≳ 300M⊙/yr), though direct evidence of such starbursts in the Gyr largely comes…
Constantin Payerne, Christophe Yèche, William d'Assignies Doumerg, Hendrik Hildebrandt + 6 more
Lyman-break galaxies (LBGs), selected via the strong spectral break blueward of the Lyman limit, are powerful tracers of large-scale structure at redshifts $z>2$. In this work, we assess the feasibility of using LBGs selected from the Ultraviolet Near Infrared Optical Northern Survey (UNIONS) multi-band photometric…
Bibhuprasad Mishra, Kanak Saha, Divya Pandey, Ananta C. pradhan
Lyman Break Galaxies (LBGs) are actively star-forming galaxies identified through their characteristic rest-frame ultraviolet spectral break, making them powerful probes of galaxy evolution across cosmic time. We present a search for LBGs at redshifts $1.6 \leq z \leq 3.0$ in the GOODS-North field using the dropout…
Hakim Atek, Iryna Chemerynska, Lukas J. Furtak, Johan Richard + 18 more
We present a comprehensive study of the galaxy UV luminosity function (UVLF) at $z=6-9$ leveraging deep JWST observations from the GLIMPSE survey. Thanks to gravitational lensing, we probe the UVLF to an unprecedented depth of $M_{\text{UV}} = -12$ mag, approximately three magnitudes deeper than previous robust…
Zhiyuan Ji, Yang Sun, Mauro Giavalisco, Anna de Graaff + 4 more
Little Red Dots (LRDs) are enigmatic, compact red sources ubiquitous in JWST deep fields whose physical nature remains elusive. As one of the most sensitive tracers of neutral hydrogen in galaxy environments, Ly$α$ is uniquely positioned to probe the gaseous structures proposed to explain LRDs' unusual properties. We…
Kasper E. Heintz, Clara L. Pollock, Joris Witstok, Rychard J. Bouwens + 22 more
Recent observations with JWST have revealed a remarkable population of surprisingly luminous galaxies at redshifts $z>10$. Their abundance exceed predictions from simulations and empirical extrapolations from lower redshifts, suggesting a transition in the physical conditions under which the first stars formed. Here we…
M. Lopez-Corredoira, C. M. Gutierrez
From James Webb Space Telescope (JWST) surveys, 31 galaxies with average redshift 7.3 are selected containing large Balmer break, Lyman- break (V-shaped SED versus ). Apart from Hubble Space Telescope (HST) and JWST-NIRCam (Near-infrared camera) photometry for these galaxies, there are JWST-NIRSpec (Near-infrared…
V. Rusakov, D. Watson, G. P. Nikopoulos, G. Brammer + 13 more
The James Webb Space Telescope (JWST) has uncovered many compact galaxies at high redshift with broad hydrogen and helium lines, including the enigmatic population of little red dots (LRDs)1,2. The nature of these galaxies is debated and is attributed to supermassive black holes (SMBHs)3,4 or intense star formation5.…
Rohan P. Naidu, Jorryt Matthee, Harley Katz, Anna de Graaff + 50 more
The physical processes that led to the formation of billion-solar-mass black holes within the first 700 million years of cosmic time, a period known as cosmic dawn, remain a puzzle1. Several theoretical scenarios have been proposed to seed and rapidly grow black holes2-4, but direct observations of these mechanisms…
Nora Elisa Chisari
The alignments of galaxies across the large-scale structure of the Universe are known to be a source of contamination for gravitational lensing, but they can also probe cosmology and the physics of galaxy evolution in many ways. In this review, I cover developments in our understanding of intrinsic alignments over the…
Tsutomu T. Takeuchi, Suchetha Cooray, Ryusei R. Kano, Remo Garattini
Matter in the early Universe was nearly uniform, and galaxies emerged through the gravitational growth of small primordial density fluctuations. Astrophysics has been trying to unveil the complex physical phenomena that have caused the formation and evolution of galaxies throughout the 13-billion-year history of the…
Wiesław M. Macek, Dariusz Wójcik
We have recently argued that the expansion of the Universe is compatible not only with standard homogeneity, but also with fractal homogeneity in a hierarchical fractal cosmology. In this work we further test this paradigm using the galactic distances obtained from the Updated CfA Redshift Catalogs. We confirm that the…