The extragalactic distance scale. I - A review of distance indicators - Zero points and errors of primary indicators

1978 ◽  
Vol 223 ◽  
pp. 351 ◽  
Author(s):  
G. de Vaucouleurs
Keyword(s):  
Distance Scale ◽  
Extragalactic Distance Scale ◽  
Distance Indicators ◽  
Zero Points

scholarly journals THE CARNEGIE-CHICAGO HUBBLE PROGRAM. I. AN INDEPENDENT APPROACH TO THE EXTRAGALACTIC DISTANCE SCALE USING ONLY POPULATION II DISTANCE INDICATORS

2016 ◽  
Vol 832 (2) ◽  
pp. 210 ◽  
Author(s):  
Rachael L. Beaton ◽  
Wendy L. Freedman ◽  
Barry F. Madore ◽  
Giuseppe Bono ◽  
Erika K. Carlson ◽  
...  
Keyword(s):  
Distance Scale ◽  
Extragalactic Distance Scale ◽  
Distance Indicators

scholarly journals The Tip of the Red Giant Branch as a Population II Distance Indicator

1999 ◽  
Vol 183 ◽  
pp. 48-53 ◽  
Author(s):  
Shoko Sakai
Keyword(s):  
Type Systems ◽  
Variable Stars ◽  
Distance Scale ◽  
Late Type ◽  
Major Disadvantage ◽  
Nearby Galaxies ◽  
Distance Indicator ◽  
Red Giant ◽  
Extragalactic Distance Scale ◽  
Distance Indicators

The period–luminosity (PL) relation of the Cepheid variable stars is the most reliable primary distance indicator for nearby galaxies, and serves as the foundation of the extragalactic distance scale, providing the firm calibration for various secondary distance indicators. However, a major disadvantage of the Cepheid distance scale is that it can only be applied to late–type systems with recent or current star formation. An alternative distance indicator is a Pop II, tip of the red giant branch (TRGB) method, which is extremely attractive because of its applicability to all morphological types of galaxies. As long as a metal–poor RGB stars are present in abundant numbers, the distance can be estimated with an accuracy that is as good as that of the Cepheid PL relation.

scholarly journals Problems Concerning the Extragalactic Distance Scale

1972 ◽  
Vol 44 ◽  
pp. 341-352
Author(s):  
G. O. Abell
Keyword(s):  
Galaxy Clusters ◽  
Hubble Parameter ◽  
Absolute Magnitude ◽  
Distance Scale ◽  
Luminosity Functions ◽  
The Absolute ◽  
The Difference ◽  
Extragalactic Distance Scale ◽  
Distance Indicators

The use of the brightest members of galaxy clusters as distance indicators is questioned because of a possible correlation between the absolute magnitude of the brightest galaxy and the richness of the cluster. Comparison of the clusters' luminosity functions is considered to be more appropriate. The difference between the two approaches is substantial when a comparison is made between the Coma and Virgo clusters. The value of the Hubble parameter may well be less than 50 km s−1 Mpc−1.

scholarly journals TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XXVI. The Calibration of Population II Secondary Distance Indicators and the Value of the Hubble Constant

2000 ◽  
Vol 529 (2) ◽  
pp. 745-767 ◽  
Author(s):  
Laura Ferrarese ◽  
Jeremy R. Mould ◽  
Robert C. Kennicutt, Jr. ◽  
John Huchra ◽  
Holland C. Ford ◽  
...  
Keyword(s):  
Hubble Constant ◽  
Distance Scale ◽  
Extragalactic Distance Scale ◽  
Distance Indicators

scholarly journals Reclassification of Cepheids in the Gaia Data Release 2

2019 ◽  
Vol 625 ◽  
pp. A14 ◽  
Author(s):  
V. Ripepi ◽  
R. Molinaro ◽  
I. Musella ◽  
M. Marconi ◽  
S. Leccia ◽  
...  
Keyword(s):  
Zero Point ◽  
Type Ii ◽  
Classical Cepheids ◽  
Data Release ◽  
Extragalactic Distance Scale ◽  
First Time ◽  
Distance Indicators ◽  
Zero Points

Context. Classical Cepheids are the most important primary indicators for the extragalactic distance scale. Establishing the precise zero points of their period-luminosity and period-Wesenheit (PL/PW) relations has profound consequences on the estimate of H0. Type II Cepheids are also important distance indicators and tracers of old stellar populations. Aims. The recent Data Release 2 (DR2) of the Gaia spacecraft includes photometry and parallaxes for thousands of classical and Type II Cepheids. We seek to review the classification of Gaia DR2 Cepheids and to derive precise PL/PW for the Magellanic Clouds (MCs) and Galactic Cepheids. Methods. We adopted information from the literature and the Gaia astrometry and photometry to assign DR2 Galactic Cepheids to the classical, anomalous, and Type II Cepheids classes. Results. We reclassified the DR2 Galactic Cepheids and derived new precise PL/PW relations in the Gaia passbands for the MCs and Milky Way Cepheids. We investigated for the first time the dependence on metallicity of the PW relation for classical Cepheids in the Gaia bands, finding inconclusive results. Conclusions. According to our analysis, the zero point of the Gaia DR2 parallaxes as estimated from classical and Type II Cepheids seems likely to be underestimated by ∼0.07 mas, which agrees with recent literature. The next Gaia data releases are expected to fix this zero point offset to allow eventually a determination of H0 to less than 1%.

scholarly journals MEASURING THE HUBBLE CONSTANT WITH THE HUBBLE SPACE TELESCOPE

2009 ◽  
Vol 5 (H15) ◽  
pp. 1-16 ◽  
Author(s):  
W. L. Freedman ◽  
R. C. Kennicutt ◽  
J. R. Mould
Keyword(s):  
Hubble Space Telescope ◽  
Hubble Constant ◽  
Distance Scale ◽  
Space Telescope ◽  
Peculiar Velocities ◽  
Extragalactic Distance Scale ◽  
Distance Indicators

AbstractTen years ago our team completed the Hubble Space Telescope Key Project on the extragalactic distance scale. Cepheids were detected in some 25 galaxies and used to calibrate four secondary distance indicators that reach out into the expansion field beyond the noise of galaxy peculiar velocities. The result was H0 = 72 ± 8 km s−1 Mpc−1 and put an end to galaxy distances uncertain by a factor of two. This work has been awarded the Gruber Prize in Cosmology for 2009.

scholarly journals Discovery of Cepheids in M100 and M101

1995 ◽  
Vol 164 ◽  
pp. 432-433
Author(s):  
Jeremy Mould ◽  
Wendy Freedman ◽  
Laura Ferrarese ◽  
Dan Kelson
Keyword(s):  
Hubble Space Telescope ◽  
Distance Scale ◽  
Expansion Rate ◽  
Distance Measurements ◽  
Space Telescope ◽  
Extragalactic Distance Scale ◽  
Distance Indicators

The Hubble Space Telescope key project to determine the extragalactic distance scale aims to measure H0 to 10%. To achieve this goal will require Cepheid distance measurements for some 20 galaxies within a redshift of approximately 103 km/s. These galaxies in turn will calibrate five secondary distance indicators which will extend the volume over which the expansion rate has been measured to some 106 Mpc3.

scholarly journals Eclipsing Binaries: Tools for Calibrating the Extragalactic Distance Scale

2006 ◽  
Vol 2 (S240) ◽  
pp. 79-87 ◽  
Author(s):  
Alceste Z. Bonanos
Keyword(s):  
Local Group ◽  
Hubble Constant ◽  
Magellanic Clouds ◽  
Distance Scale ◽  
Eclipsing Binaries ◽  
Fundamental Parameters ◽  
Andromeda Galaxy ◽  
Formation And Evolution ◽  
Extragalactic Distance Scale ◽  
Distance Indicators

AbstractIn the last decade, over 7000 eclipsing binaries have been discovered in the Local Group through various variability surveys. Measuring fundamental parameters of these eclipsing binaries has become feasible with 8 meter class telescopes, making it possible to use eclipsing binaries as distance indicators. Distances with eclipsing binaries provide an independent method for calibrating the extragalactic distance scale and thus determining the Hubble constant. This method has been used for determining distances to eclipsing binaries in the Magellanic Clouds and the Andromeda Galaxy and most recently to a detached eclipsing binary in the Triangulum Galaxy by the DIRECT Project. The increasing number of eclipsing binaries found by microlensing and variability surveys also provide a rich database for advancing our understanding of star formation and evolution.

Sign in / Sign up

Export Citation Format

Share Document