The Extragalactic Distance Scale Key Project. III. The Discovery of Cepheids and a New Distance to M101 Using the Hubble Space Telescope

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.

Download Full-text

The H0 Key Project: Cepheids in NGC925, M101 and M100

International Astronomical Union Colloquium ◽

10.1017/s0252921100037076 ◽

1995 ◽

Vol 155 ◽

pp. 258-259

Author(s):

S. M. G. Hughes

Keyword(s):

Standard Model ◽

Hubble Space Telescope ◽

Big Bang ◽

Distance Scale ◽

Space Telescope ◽

The Standard Model ◽

Age Of The Universe ◽

Extragalactic Distance Scale ◽

The Big Bang ◽

The Universe

AbstractAs part of the Extragalactic Distance Scale Key Project, the Hubble Space Telescope has been used to identify Cepheids in M100, M101 and NGC925, and to measure distances derived from the Cepheid PL relation. For M100, the distance of 17.1 ± 1.8 Mpc has been used to infer a preliminary value for H0 of ~ 80 km/s/Mpc, which brings the age of the Universe derived from the standard model of the Big Bang into conflict with the ages of the oldest stars.

Download Full-text

Variable Stars and the Cosmic Distance Scale

International Astronomical Union Colloquium ◽

10.1017/s0252921100011507 ◽

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.

Download Full-text

The Hubble Space Telescope Key Project on the Extragalactic Distance Scale. VI. The Cepheids in NGC 925

The Astrophysical Journal ◽

10.1086/177845 ◽

1996 ◽

Vol 470 ◽

pp. 1 ◽

Cited By ~ 69

Author(s):

N. A. Silbermann ◽

Paul Harding ◽

Barry F. Madore ◽

Robert C., Jr. Kennicutt ◽

Abhijit Saha ◽

...

Keyword(s):

Hubble Space Telescope ◽

Distance Scale ◽

Space Telescope ◽

Extragalactic Distance Scale

Download Full-text

MEASURING THE HUBBLE CONSTANT WITH THE HUBBLE SPACE TELESCOPE

Proceedings of the International Astronomical Union ◽

10.1017/s1743921310008148 ◽

2009 ◽

Vol 5 (H15) ◽

pp. 1-16 ◽

Cited By ~ 1

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.

Download Full-text

The Hubble Space Telescope Extragalactic Distance Scale Key Project. 1: The discovery of Cepheids and a new distance to M81

The Astrophysical Journal ◽

10.1086/174172 ◽

1994 ◽

Vol 427 ◽

pp. 628 ◽

Cited By ~ 396

Author(s):

Wendy L. Freedman ◽

Shaun M. Hughes ◽

Barry F. Madore ◽

Jeremy R. Mould ◽

Myung Gyoon Lee ◽

...

Keyword(s):

Hubble Space Telescope ◽

Distance Scale ◽

Space Telescope ◽

Extragalactic Distance Scale

Download Full-text

The Extragalactic Distance Scale Key Project. IV. The Discovery of Cepheids and a New Distance to M100 Using the Hubble Space Telescope

The Astrophysical Journal ◽

10.1086/177347 ◽

1996 ◽

Vol 464 ◽

pp. 568 ◽

Cited By ~ 146

Author(s):

Laura Ferrarese ◽

Wendy L. Freedman ◽

Robert J. Hill ◽

Abhijit Saha ◽

Barry F. Madore ◽

...

Keyword(s):

Hubble Space Telescope ◽

Distance Scale ◽

Space Telescope ◽

Extragalactic Distance Scale

Download Full-text

Discovery of Cepheids in M100 and M101

Symposium - International Astronomical Union ◽

10.1017/s0074180900109465 ◽

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.

Download Full-text