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There are many different approaches to using observations to constrain or determine the global cosmological parameters that describe our universe. Methods that rely upon a determination of the coordinate distance to high-redshift sources…

Astrophysics · Physics 2009-11-07 Ruth A. Daly , Matthew P. Mory , Erick J. Guerra

A well constrained estimate of the distance remains one of the main factors to properly interpret the observations of accreting X-ray pulsars. Since these objects are typically well studied, multiple distance estimates obtained with…

High Energy Astrophysical Phenomena · Physics 2019-11-26 S. Treuz , V. Doroshenko , A. Santangelo , R. Staubert

Cosmology with large interferometric telescopes is a rich and largely unexplored subject, involving three types of measurement: astrometric measurement of absolute distances and proper motions, dispersions of relative proper motions, and…

Astrophysics · Physics 2007-05-23 David Tytler

The cosmological luminosity-distance can be measured from gravitational wave (GW) standard sirens, free of astronomical distance ladders and the associated systematics. However, it may still contain systematics arising from various…

Cosmology and Nongalactic Astrophysics · Physics 2021-08-25 Pengjie Zhang , Hai Yu

Understanding the structure, formation and evolution of the Galactic Bulge requires the proper determination of spatial metallicity gradients in both the radial and vertical directions. RR Lyrae pulsators, known to be excellent distance…

Solar and Stellar Astrophysics · Physics 2015-06-22 Sara Alejandra Sans Fuentes , Joris De Ridder

We propose a novel approach for parameterizing the luminosity distance, based on the use of rational "Pad\'e" approximations. This new technique extends standard Taylor treatments, overcoming possible convergence issues at high redshifts…

General Relativity and Quantum Cosmology · Physics 2015-06-19 Alejandro Aviles , Alessandro Bravetti , Salvatore Capozziello , Orlando Luongo

BVI photometry of the Magellanic Clouds collected during the OGLE-II microlensing experiment makes it possible to study in detail photometric properties of the "major" stellar distance indicators in the Magellanic Clouds. In addition to…

Astrophysics · Physics 2007-05-23 A. Udalski

The correlation between the luminosities and rotation velocities of galaxies can be used to estimate distances to late-type galaxies. It is an appropriate moment to re-evaluate this method given the great deal of new information available.…

Astrophysics · Physics 2014-10-13 R. Brent Tully , M. J. Pierce

The interpretation of cosmological observations relies on a notion of an average Universe, which is usually considered as the homogeneous and isotropic Friedmann-Lema\^itre-Robertson-Walker (FLRW) model. However, inhomogeneities may…

Cosmology and Nongalactic Astrophysics · Physics 2021-11-24 Michel-Andrès Breton , Pierre Fleury

The extragalactic distance scale relies heavily on Cepheids. However, it has become clear from observations and pulsation models that the slope and zero point of their P-L relations differ from galaxy to galaxy. This makes the determination…

Astrophysics · Physics 2009-11-13 G. A. Tammann , A. Sandage , B. Reindl

The Hubble-Lemaitre tension is currently one of the most important questions in cosmology. Most of the focus so far has been on reconciling the Hubble constant value inferred from detailed cosmic microwave background measurement with that…

Cosmology and Nongalactic Astrophysics · Physics 2023-11-29 Kylar L. Greene , Francis-Yan Cyr-Racine

Context. The precise determinations of stellar mass at $\sim$1% provide important constraints on stellar evolution models. Accurate parallax measurements can also serve as independent benchmarks for the next Gaia data release. Aims. We aim…

Solar and Stellar Astrophysics · Physics 2019-11-27 A. Gallenne , G. Pietrzyński , D. Graczyk , B. Pilecki , J. Storm , N. Nardetto , M. Taormina , W. Gieren , A. Tkachenko , P. Kervella , A. Mérand , M. Weber

We provide uniform RR Lyrae-based distances to 39 dwarf galaxies in and around the Local Group. We determine distances based on a Bayesian hierarchical model that uses periods and magnitudes of published RR Lyrae in dwarf galaxies and is…

Astrophysics of Galaxies · Physics 2022-06-17 Pranav Nagarajan , Daniel R. Weisz , Kareem El-Badry

The answers to fundamental science questions in astrophysics, ranging from the history of the expansion of the universe to the sizes of nearby stars, hinge on our ability to make precise measurements of diverse astronomical objects. As our…

The $m$-$z$ relation for Type Ia supernovae is compatible with the cosmological concordance model if one assumes that the Universe is homogeneous, at least with respect to light propagation. This could be due to the density along each line…

Cosmology and Nongalactic Astrophysics · Physics 2015-09-16 Phillip Helbig

I present a review of the research and analysis paths that converged to make Type Ia SNe the most mature cosmological distance estimator of the present time. The narrative starts with the first works in the early decades of the 20th century…

Cosmology and Nongalactic Astrophysics · Physics 2011-12-06 Alejandro Clocchiatti

That the RR Lyrae star period -- K-band luminosity relation is a promising tool as a distance indicator in the Milky Way and Local Group of Galaxies is apparent on observational and theoretical grounds in the literature. Less clear is the…

Astrophysics · Physics 2009-11-07 D. J. Butler

We show that the spatial correlation of the intrinsic alignments (IAs) of galaxies, measured in galaxy redshift surveys, offers a precision route to improve the geometrical and dynamical constraints on cosmology. The IA has been treated as…

Cosmology and Nongalactic Astrophysics · Physics 2020-03-25 Atsushi Taruya , Teppei Okumura

Hubble tension is one of the most important problems in cosmology. Although the local measurements on the Hubble constant with Type Ia supernovae (SNe Ia) are independent of cosmological models, they suffer the problem of zero-point…

General Relativity and Quantum Cosmology · Physics 2023-10-24 Xuchen Lu , Yungui Gong

Stellar distances constitute a foundational pillar of astrophysics. The publication of 1.47 billion stellar parallaxes from Gaia is a major contribution to this. Yet despite Gaia's precision, the majority of these stars are so distant or…

Solar and Stellar Astrophysics · Physics 2021-02-26 C. A. L. Bailer-Jones , J. Rybizki , M. Fouesneau , M. Demleitner , R. Andrae
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