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 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 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.

scholarly journals Distance Indicators in the Magellanic Clouds

1983 ◽  
Vol 6 ◽  
pp. 209-216 ◽  
Author(s):  
J.A. Graham
Keyword(s):  
Chemical Evolution ◽  
Comparative Studies ◽  
Hubble Constant ◽  
Magellanic Clouds ◽  
Distance Scale ◽  
Stellar Systems ◽  
Age Range ◽  
Distance Indicators ◽  
The Universe

In talking about the overall distance scale of the Universe and the Hubble Constant, the Magellanic Clouds are good places to start. They are stellar systems large enough to contain stars, clusters and nebulae of all types, covering a wide age range. With modern telescopes and detectors, we are able to observe stars from the very bright down to those fainter intrinsically than our own Sun. From comparative studies, we may thus establish our basic calibrations of bright objects before moving out to measure the Universe at large. At the same time, the fact that both Magellanic Clouds are independently evolving galaxies, enables us to separate the effects of stellar age and chemical evolution on the calibrations that we make.

TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XXVIII. Combining the Constraints on the Hubble Constant

2000 ◽  
Vol 529 (2) ◽  
pp. 786-794 ◽  
Author(s):  
Jeremy R. Mould ◽  
John P. Huchra ◽  
Wendy L. Freedman ◽  
Robert C. Kennicutt, Jr. ◽  
Laura Ferrarese ◽  
...  
Keyword(s):  
Hubble Constant ◽  
Distance Scale ◽  
Extragalactic Distance Scale

scholarly journals The Linearity of the Cosmic Expansion Field and the Value of the Hubble Constant

1999 ◽  
Vol 183 ◽  
pp. 31-47
Author(s):  
G. A. Tammann
Keyword(s):  
Hubble Constant ◽  
Physical Distance ◽  
Mean Value ◽  
Distance Scale ◽  
Gravitational Lenses ◽  
Cosmic Expansion ◽  
Type Ia ◽  
The Mean ◽  
Extragalactic Distance Scale ◽  
Linearity Test

A linearity test shows H0 to decrease by 7% out to 18 000 km s–1. The value at 10 000 km s–1 is a good approximation to the mean value of H0 over very large scales. The construction of the extragalactic distance scale is discussed. Field galaxies, cluster distances relative to Virgo, and blue supernovae of type Ia yield H0 (cosmic) with increasing weight; they give consistently H0 = 57 ± 7 (external error). This value is supported by purely physical distance determinations (SZ effect, gravitational lenses, MWB fluctuations). Arguments for H0 > 70 are discussed and shown to be flawed.

scholarly journals The Virgo Cluster

2012 ◽  
Vol 8 (S289) ◽  
pp. 262-268
Author(s):  
Jeremy Mould
Keyword(s):  
Hubble Space Telescope ◽  
Hubble Constant ◽  
Virgo Cluster ◽  
Distance Scale ◽  
Wilkinson Microwave Anisotropy Probe ◽  
Traditional Role ◽  
Distance Measurements ◽  
Redshift Surveys ◽  
Extragalactic Distance Scale

AbstractIn the era of precision cosmology, the Virgo cluster takes on a new role in the cosmic distance scale. Its traditional role of testing the consistency of secondary distance indicators is replaced by an ensemble of distance measurements within the Local Supercluster, united by a velocity-field model obtained from a reconstruction based on redshift surveys. The Wilkinson Microwave Anisotropy Probe (WMAP) leads us to see the Hubble constant as one of six parameters in a standard model of cosmology with considerable covariance among parameters. Independent experiments, such as WMAP, the Hubble Space Telescope Key Project on the Extragalactic Distance Scale, and their successors constrain these parameters.

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
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