Zobrazeno 1 - 10
of 2 575
pro vyhledávání: '"observational cosmology"'
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 11 (2024)
IntroductionGalaxy cluster lensing is a powerful tool for measuring the mass of galaxy clusters, but accurate shear measurement and calibration are critical to obtaining reliable results. This study focuses on the measurement and calibration of weak
Externí odkaz:
https://doaj.org/article/9c9cb88e13bf43e3b2ef50421b602dbc
Publikováno v:
The Astrophysical Journal Letters, Vol 975, Iss 1, p L18 (2024)
The intensity of the extragalactic background (EBL), the accumulated optical and infrared emissions since the first stars, is the subject of a decades-long tension in the optical band. These photons form a target field that attenuates the γ -ray flu
Externí odkaz:
https://doaj.org/article/afedda8708a34ef7a2258f3cf51edf67
Autor:
Irene Moskowitz, Eric Gawiser, John Franklin Crenshaw, Brett H. Andrews, Alex I. Malz, Samuel Schmidt, The LSST Dark Energy Science Collaboration
Publikováno v:
The Astrophysical Journal Letters, Vol 967, Iss 1, p L6 (2024)
Large imaging surveys will rely on photometric redshifts (photo- z 's), which are typically estimated through machine-learning methods. Currently planned spectroscopic surveys will not be deep enough to produce a representative training sample for Le
Externí odkaz:
https://doaj.org/article/4d1d6cf1f74f45f3a2b470e95d6cc4bd
Publikováno v:
The Astrophysical Journal Letters, Vol 965, Iss 1, p L11 (2024)
In this Letter, we propose a model-independent method to determine the Hubble constant and curvature simultaneously by taking advantage of the possibilities of future spaceborne gravitational-wave detector DECIGO in combination with the radio quasars
Externí odkaz:
https://doaj.org/article/8a384f0cdfe540448fe7a1203ceb1230
Publikováno v:
The Astrophysical Journal Letters, Vol 964, Iss 1, p L4 (2024)
We systematically explore the influence of the prior of the peak absolute magnitude ( M ) of Type Ia supernovae (SNe Ia) on the measurement of the Hubble constant ( H _0 ) from SNe Ia observations. We consider five different data-motivated M priors,
Externí odkaz:
https://doaj.org/article/4db993acf2664d9691531c8de5ca04b6
Publikováno v:
Universe, Vol 10, Iss 3, p 140 (2024)
A critical discussion on the H0 Hubble constant tension is presented by considering both early and late-type observations. From recent precise measurements, discrepancies emerge when comparing results for some cosmological quantities obtained at diff
Externí odkaz:
https://doaj.org/article/ac8d9683848549f49467dc1c61cf0b88
Autor:
Prabhakar Tiwari, Dominik J. Schwarz, Gong-Bo Zhao, Ruth Durrer, Martin Kunz, Hamsa Padmanabhan
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 279 (2024)
We utilize the Sloan Digital Sky Survey (SDSS) extended Baryon Oscillation Spectroscopic Survey and Baryon Oscillation Spectroscopic Survey catalogs with precise spectroscopic redshifts to estimate the kinematic redshift dipole caused by the proper m
Externí odkaz:
https://doaj.org/article/918fadbbe8da4bf496d912e70aff2a7b
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 275 (2024)
The present work begins by examining the early-Universe inflationary epoch of a special K-essence model, which incorporates a linear coupling term between the scalar field potential and the canonical Lagrangian. For the power-law potential, we both n
Externí odkaz:
https://doaj.org/article/3df658731365474ab730ec35305d47eb
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 208 (2024)
We present an analysis of JWST Ly α spectroscopy of z ≳ 6.5 galaxies, using observations in the public archive covering galaxies in four independent fields: Great Observatories Origins Deep Survey (GOODS)-N, GOODS-S, A2744, and the Extended Groth
Externí odkaz:
https://doaj.org/article/6bec3b61ad7c42f386f9ff4849093ba7