Unraveling the enigmatic soft x‐ray excess: Current understanding and future perspectives
Astronomische Nachrichten, Volume 344, Issue 6, August 2023., 2023 Abstract This article explores various theoretical models proposed to explain the soft x‐ray excess phenomenon, including warm Comptonization, ionized reflection models, and ionized outflowing disc winds. The soft x‐ray excess is better understood thanks to crucial observations made by ROSAT, XMM‐Newton, and eROSITA.
Thomas Boller
wiley +1 more source
The Sparkler: Evolved High-redshift Globular Cluster Candidates Captured by JWST [PDF]
Astrophysical Journal Letters, 2022 Using data from JWST, we analyse the compact sources (“sparkles”) located around a remarkable z spec = 1.378 galaxy (the ‘Sparkler) that is strongly gravitationally lensed by the z = 0.39 galaxy cluster SMACS J0723.3-7327.
L. Mowla +18 more
semanticscholar +1 more source
Annalen der Physik, Volume 535, Issue 7, July 2023., 2023 Implications for the cosmological model are explored of the assumption that the cosmic microwave background is subject to an SU(2) Yang– Mills theory of scale 10−4 eV rather than U(1) quantum thermodynamics. This concerns zeroth‐order (changes at high redshifts) and first‐order cosmological perturbations (changes at high and low redshifts).
Ralf Hofmann +2 more
wiley +1 more source
The Three Hundred–NIKA2 Sunyaev–Zeldovich Large Program twin samples: Synthetic clusters to support real observations [PDF]
EPJ Web of Conferences, 2022 The simulation database of The Three Hundred Project has been used to pick synthetic clusters of galaxies with properties close to the observational targets of the NIKA2 camera Sunyaev–Zeldovich (SZ) Large Program.
Paliwal A. +14 more
doaj +1 more source
Characteristic Features of Gravitational Wave Lensing as Probe of Lens Mass Model
Annalen der Physik, Volume 535, Issue 6, June 2023., 2023 The gravitational lensing of gravitational waves is an expanding field in astronomy and cosmology. It might contribute to solving many different issue in these fields. To exploit its potential, first of all, one needs to recognize and model a gravitational wave event properly.
Paolo Cremonese +2 more
wiley +1 more source
Distant Galaxy Clusters Identified From Optical Background Fluctuations [PDF]
, 1996 We present the first high redshift (0.3 < z < 1.1) galaxy clusters found by systematically identifying optical low surface brightness fluctuations in the background sky.
Dalcanton, Julianne J. +3 more
core +3 more sources
A massive blow for ΛCDM – the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology [PDF]
, 2020 El Gordo (ACT-CL J0102-4915) is an extremely massive galaxy cluster ($M_{200} \approx 3 \times 10^{15}$ $M_{\odot}$) at redshift $z = 0.87 $ composed of two subclusters with mass ratio 3.6 merging at speed $V_{infall} \approx 2500$ km/s.
Elena Asencio, I. Banik, P. Kroupa
semanticscholar +1 more source
Revisiting the emission line source detection problem in integral field spectroscopic data
Astronomische Nachrichten, Volume 344, Issue 5, June 2023., 2023 Abstract We present a 3‐dimensional matched filtering approach for the blind search of faint emission‐line sources in integral‐field spectroscopic datasets. The filter is designed to account for the spectrally rapidly varying background noise due to the telluric air glow spectrum.
Edmund Christian Herenz
wiley +1 more source
The build-up of the colour-magnitude relation in galaxy clusters since z~0.8 [PDF]
, 2006 Using galaxy clusters from the ESO Distant Cluster Survey, we study how the distribution of galaxies along the colour-magnitude relation has evolved since z~0.8.
Aragon-Salamanca, Alfonso +13 more
core +3 more sources
Estimating f_NL and g_NL from Massive High-Redshift Galaxy Clusters [PDF]
, 2010 There are observations of at least 14 high-redshift massive galaxy clusters, which have an extremely small probability with a purely Gaussian initial curvature perturbation.
K. Enqvist, S. Hotchkiss, Olli Taanila
semanticscholar +1 more source