Results 21 to 30 of about 441,685 (256)
Prospect for cosmological parameter estimation using future Hubble parameter measurements [PDF]
Commun. Theor. Phys. 70 (2018) 445-450, 2018 We constrain cosmological parameters using only Hubble parameter data and quantify the impact of future Hubble parameter measurements on parameter estimation for the most typical dark energy models. We first constrain cosmological parameters using 52 current Hubble parameter data including the Hubble constant measurement from the Hubble Space Telescope.
arxiv +1 more source
Constraint on the equation of state parameter (ω) in non-minimally coupled f(Q) gravity
Physics Letters B, 2021 We study observational constraints on the modified symmetric teleparallel gravity, the non-metricity f(Q) gravity, which reproduces background expansion of the universe.
Sanjay Mandal, P.K. Sahoo
doaj
Expectations for Astrometry with the Hubble Space Telescope [PDF]
Symposium - International Astronomical Union, 1990 The Hubble Space Telescope, a large optical instrument having an aperture of 2.4 meters and a length of 8.8 meters has been developed by the U.S. National Aeronautics and Space Administration in cooperation with the European Space Agency. The Space Shuttle will be used to place the telescope in orbit.
Raynor L. Duncombe +4 more
openaire +2 more sources
A 1.3% Distance to M33 from Hubble Space Telescope Cepheid Photometry
The Astrophysical Journal, 2023 We present a low-dispersion period–luminosity relation (PL) based on 154 Cepheids in Messier 33 (M33) with Hubble Space Telescope (HST) photometry from the PHATTER survey.
Louise Breuval +9 more
doaj +1 more source
Beyond the Hubble Space Telescope [PDF]
Nature, 1996 NASA needs to develop a new generation of space observatories embracing the theme of 'cosmic origins' if it is to maintain its lead in the exploration of space.
Thronson, H. A. +2 more
openaire +3 more sources
The UNCOVER Survey: A First-look HST + JWST Catalog of 60,000 Galaxies near A2744 and beyond
The Astrophysical Journal Supplement Series, 2023 In 2022 November, the James Webb Space Telescope (JWST) returned deep near-infrared images of A2744—a powerful lensing cluster capable of magnifying distant, incipient galaxies beyond it.
John R. Weaver +45 more
doaj +1 more source
Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. IV: Measurement for Sculptor [PDF]
Astron.J.133:818-844,2007; Astron.J.131:1445-1460,2006, 2006 This article presents a measurement of the proper motion of the Sculptor dwarf spheroidal galaxy determined from images taken with the Hubble Space Telescope using the Space Telescope Imaging Spectrograph in the imaging mode.
arxiv +1 more source
Proper Motions of Jets on the Kiloparsec Scale: New Results with HST
Galaxies, 2017 The Hubble Space Telescope recently celebrated 25 years of operation. Some of the first images of extragalactic optical jets were taken by HST in the mid-1990s; with time baselines on the order of 20 years and state-of-the-art astrometry techniques, we ...
Eileen T. Meyer +9 more
doaj +1 more source
European Physical Journal C: Particles and Fields, 2023 Recent observations of the Cosmic Microwave Background and the Hubble Space Telescope obtain two different values of the Hubble constant with a discrepancy of at least $$4.4 \sigma $$ 4.4 σ , which is now known as the Hubble tension.
Man Ho Chan
doaj +1 more source
Distances to 10 nearby galaxies observed with the Hubble space telescope [PDF]
, 2023 Images of 10 galaxies in F814W and F606W filters obtained on the Hubble Space Telescope (HST) are used to construct color-magnitude diagrams for the star population of these galaxies. The distances to the galaxies are estimated from the luminosity of the tip of the red giant branch. The galaxies examined here have radial velocities from 250 to 760 km/s
arxiv +1 more source