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 Hubble Space Telescope Key Project to Measure the Hubble Constant

1999 ◽  
Vol 183 ◽  
pp. 17-30 ◽  
Author(s):  
Wendy L. Freedman ◽  
Jeremy R. Mould ◽  
Robert C. Kennicutt ◽  
Barry F. Madore
Keyword(s):  
Hubble Space Telescope ◽  
Hubble Constant ◽  
Distance Scale ◽  
General Assembly ◽  
Host Galaxies ◽  
Space Telescope ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Extragalactic Distance Scale

A Joint Discussion on the extragalactic distance scale and the Hubble constant took place fifteen years ago, at the 1982 XVIIIth General Assembly of the IAU, held in Patras, Greece. At that time, the newest applications of infrared photometers to Tully-Fisher measurements (Aaronson 1983) and Cepheid distances (Madore 1983) were reported. CCDs were just coming into use and had not yet been applied to extragalactic distance determinations; all of the extragalactic Cepheid distances were based on photographic Argelander (eye-estimated) photometry (Tammann and Sandage 1983 and references therein). No Cepheid distances to type Ia supernova-host galaxies were available.

scholarly journals Allan Sandage and the distance scale

2012 ◽  
Vol 8 (S289) ◽  
pp. 13-25 ◽  
Author(s):  
G. A. Tammann ◽  
B. Reindl
Keyword(s):  
Large Scale ◽  
Hubble Space Telescope ◽  
Hubble Constant ◽  
Distance Scale ◽  
Type Ia ◽  
The Mean ◽  
Red Giant ◽  
Ia Supernovae ◽  
Distance Indicators ◽  
Local Value

AbstractAllan Sandage returned to the distance scale and the calibration of the Hubble constant again and again during his active life, experimenting with different distance indicators. In 1952 his proof of the high luminosity of Cepheids confirmed Baade's revision of the distance scale (H0 ~ 250 km s−1 Mpc−1). During the next 25 years, he lowered the value to 75 and 55. Upon the arrival of the Hubble Space Telescope, he observed Cepheids to calibrate the mean luminosity of nearby Type Ia supernovae (SNe Ia) which, used as standard candles, led to the cosmic value of H0 = 62.3 ± 1.3 ± 5.0 km s−1 Mpc−1. Eventually he turned to the tip of the red giant branch (TRGB) as a very powerful distance indicator. A compilation of 176 TRGB distances yielded a mean, very local value of H0 = 62.9 ± 1.6 km s−1 Mpc−1 and shed light on the streaming velocities in the Local Supercluster. Moreover, TRGB distances are now available for six SNe Ia; if their mean luminosity is applied to distant SNe Ia, one obtains H0 = 64.6 ± 1.6 ± 2.0 km s−1 Mpc−1. The weighted mean of the two independent large-scale calibrations yields H0 = 64.1 km s−1 Mpc−1 within 3.6%.

scholarly journals TheHubble Space TelescopeKey Project on the Extragalactic Distance Scale. XXV. A Recalibration of Cepheid Distances to Type Ia Supernovae and the Value of the Hubble Constant

2000 ◽  
Vol 529 (2) ◽  
pp. 723-744 ◽  
Author(s):  
Brad K. Gibson ◽  
Peter B. Stetson ◽  
Wendy L. Freedman ◽  
Jeremy R. Mould ◽  
Robert C. Kennicutt, Jr. ◽  
...  
Keyword(s):  
Hubble Constant ◽  
Distance Scale ◽  
Type Ia Supernovae ◽  
Type Ia ◽  
Ia Supernovae ◽  
Extragalactic Distance Scale

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 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.

The Extragalactic Distance Scale and the Hubble Constant

1983 ◽  
pp. 203-317
Author(s):  
P. W. Hodge ◽  
J. A. Graham ◽  
Barry F. Madore ◽  
S. V. M. Clube ◽  
David A. Hanes ◽  
...  
Keyword(s):  
Hubble Constant ◽  
Distance Scale ◽  
Extragalactic Distance Scale

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

2000 ◽  
Vol 545 (1) ◽  
pp. 547-547 ◽  
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 Variable Stars and the Cosmic Distance Scale

1989 ◽  
Vol 111 ◽  
pp. 169-176
Author(s):  
Jeremy Mould
Keyword(s):  
Hubble Space Telescope ◽  
Hubble Constant ◽  
Variable Stars ◽  
Virgo Cluster ◽  
Distance Scale ◽  
Stellar Structure ◽  
Space Telescope ◽  
Pulsating Variable Stars ◽  
Extragalactic Distance Scale ◽  
Detector Technology

For three quarters of a century pulsating variable stars have lain at the foundation of the extragalactic distance scale. The construction of larger telescopes, advances in detector technology, hard work by observers, and our understanding of stellar structure have all contributed to the expansion of the realm of the Cepheids to the distance of M101. Now, with the advent of Hubble Space Telescope (HST), we can look forward to the detection of Cepheids in the Virgo cluster and the removal of much of the remaining uncertainty in the Hubble constant.

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