Results 81 to 90 of about 1,730 (181)

Cepheid and SNIa Distance Scales

, 2001
We first discuss why there remains continuing, strong motivation to investigate Hubble's Constant. Then we review new evidence from an investigation of the Galactic Open Clusters containing Cepheids by Hoyle et al. that the metallicity dependence of the Cepheid P-L relation is stronger than expected. This result is supported by a new analysis of mainly
Shanks, T., Allen, P. D., Hoyle, F., Tanvir, N. R.   +3 more
openaire   +2 more sources

The TRGB−SBF Project. III. Refining the HST Surface Brightness Fluctuation Distance Scale Calibration with JWST

The Astrophysical Journal
The TRGB−SBF Project team is developing an independent distance ladder using a geometrical calibration of the tip of the red giant branch (TRGB) method in elliptical galaxies that can, in turn, be used to set the surface brightness fluctuation (SBF ...
Joseph B. Jensen, John P. Blakeslee, Michele Cantiello, Mikaela Cowles, Gagandeep S. Anand, R. Brent Tully, Ehsan Kourkchi, Gabriella Raimondo   +7 more
doaj   +1 more source

NEW CATALOG OF DISTANCES AND LIGHT CURVE PARAMETERS OF CLASSICAL CEPHEIDS

Odessa Astronomical Publications, 2017
A new version of the catalogue of distances and light-curve parameters for galactic classical Cepheids is presented. The catalogue lists amplitudes, magnitudes at maximum light, and intensity means for 515 stars in UBVRI filters of the Johnson system ...
L. N. Berdnikov
doaj   +1 more source

The distances of cepheid variables [PDF]

Monthly Notices of the Royal Astronomical Society, 1977
T. G. Barnes, J. F. Dominy, D. S. Evans, P. W. Kelton, S. B. Parsons, R. J. Stover   +5 more
openaire   +1 more source

JWST Validates HST Distance Measurements: Selection of Supernova Subsample Explains Differences in JWST Estimates of Local H 0

The Astrophysical Journal
We cross-check the Hubble Space Telescope (HST) Cepheid/Type Ia supernova (SN Ia) distance ladder, which yields the most precise local H _0 , against early James Webb Space Telescope (JWST) subsamples (∼1/4 of the HST sample) from SH0ES and CCHP ...
Adam G. Riess, Dan Scolnic, Gagandeep S. Anand, Louise Breuval, Stefano Casertano, Lucas M. Macri, Siyang Li, Wenlong Yuan, Caroline D. Huang, Saurabh Jha, Yukei S. Murakami, Rachael Beaton, Dillon Brout, Tianrui Wu, Graeme E. Addison, Charles Bennett, Richard I. Anderson, Alexei V. Filippenko, Anthony Carr   +18 more
doaj   +1 more source

The TRGB-SBF Project. I. A Tip of the Red Giant Branch Distance to the Fornax Cluster with JWST

The Astrophysical Journal
Differences between the local value of the Hubble constant measured via the distance ladder versus the value inferred from the cosmic microwave background with the assumption of the standard ΛCDM model have reached over 5 σ significance.
Gagandeep S. Anand, R. Brent Tully, Yotam Cohen, Dmitry I. Makarov, Lidia N. Makarova, Joseph B. Jensen, John P. Blakeslee, Michele Cantiello, Ehsan Kourkchi, Gabriella Raimondo   +9 more
doaj   +1 more source

Abstracts From AIDS 2026, the 26th International AIDS Conference, 26 – 31 July 2026 Rio de Janeiro, Brazil & virtual

Journal of the International AIDS Society, Volume 29, Issue S4, July 2026.
wiley   +1 more source

Publication Only

HemaSphere, Volume 10, Issue S1, June 2026.
wiley   +1 more source

Resolving the Hubble tension 68.261 and 73.510 km s−1 Mpc−1

AIP Advances
We present, when calculating distance ladders, that using the expression H = (km/Mpc)/AU (AU is the age of the universe) to describe the metric expansion of space in a universe with flat curvature, we resolve a baseline expression for the Hubble constant
Jody A. Geiger
doaj   +1 more source

A Bayesian Analysis of the Cepheid Distance Scale

The Astrophysical Journal, 2003
We develop and describe a Bayesian statistical analysis to solve the surface brightness equations for Cepheid distances and stellar properties. Our analysis provides a mathematically rigorous and objective solution to the problem, including immunity from Lutz-Kelker bias.
Barnes III, T. G., Jefferys, W. H., Berger, J. O., Mueller, P. J., Orr, K., Rodriguez, R.   +5 more
openaire   +2 more sources