5 papers
The ACS Virgo Cluster Survey V: SBF Calibration for Giant and Dwarf Early-type Galaxies
Simona Mei, John P. Blakeslee, John L. Tonry +7
As part of the Advanced Camera for Survey (ACS) Virgo Cluster Survey, we have measured Surface Brightness Fluctuations (SBF) in a sample of 100 early-type Virgo galaxies. Distances…
The Extragalactic Distance Scale
Joseph B. Jensen, John L. Tonry, John P. Blakeslee
Significant progress has been made during the last 10 years toward resolving the debate over the expansion rate of the Universe. The current value of the Hubble parameter, Ho, is n…
Comparing the SBF Survey Velocity Field with the Gravity Field from Redshift Surveys
J. P. Blakeslee, M. Davis, J. L. Tonry +2
We compare the predicted local peculiar velocity field from the IRAS 1.2 Jy flux-limited redshift survey and the Optical Redshift Survey (ORS) to the measured peculiar velocities f…
The Orthogonal Transfer CCD
John L. Tonry, Barry E. Burke, Paul L. Schechter
We have designed and built a new type of CCD that we call an orthogonal transfer CCD (OTCCD), which permits parallel clocking horizontally as well as vertically. The device has bee…
The Quadruple Gravitational Lens PG1115+080: Time Delays and Models
P. L. Schechter, C. D. Bailyn, R. Barr +24
Optical photometry is presented for the quadruple gravitational lens PG1115+080. A preliminary reduction of data taken from November 1995 to June 1996 gives component ``C'' leading…