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For refcode 2001ApJ...550..503J:
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Copyright by American Astronomical Society. Reproduced by permission
2001ApJ...550..503J The Infrared Surface Brightness Fluctuation Hubble Constant Joseph B. Jensen Gemini Observatory, 670 North A'ohoku Place, Hilo, HI 96720; jjensen@gemini.edu John L. Tonry Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822; jt@avidya.ifa.hawaii.edu Rodger I. Thompson Steward Observatory, University of Arizona, Tucson, AZ 85721; rthompson@as.arizona.edu Edward A. Ajhar and Tod R. Lauer National Optical Astronomical Observatories, PO Box 26732, Tucson, AZ 85726; ajhar@noao.edu, lauer@noao.edu Marcia J. Rieke Steward Observatory, University of Arizona, Tucson, AZ 85721; mrieke@as.arizona.edu Marc Postman Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; postman@stsci.edu and Michael C. Liu Department of Astronomy, University of California, Berkeley, CA 94720; mliu@astro.berkeley.edu Received 2000 October 20; accepted 2000 November 10 ABSTRACT We measured infrared surface brightness fluctuation (SBF) distances to an isotropically distributed sample of 16 distant galaxies with redshifts reaching 10,000 km s^-1^ using the near-IR camera and multiobject spectrometer (NICMOS) on the Hubble Space Telescope (HST). The excellent spatial resolution, very low background, and brightness of the IR fluctuations yielded the most distant SBF measurements to date. Twelve nearby galaxies were also observed and used to calibrate the F160W (1.6 micron) SBF distance scale. Of these, three have Cepheid variable star distances measured with HST and eleven have optical I-band SBF distance measurements. A distance modulus of 18.5 mag to the Large Magellanic Cloud was adopted for this calibration. We present the F160W SBF Hubble diagram and find a Hubble constant H_0_ = 76 +/- 1.3 (1 {sigma} statistical) 16 (systematic) km s^-1^ Mpc^-1^. This result is insensitive to the velocity model used to correct for local bulk motions. Restricting the fit to the six most distant galaxies yields the smallest value of H_0_ = 72 +/- 2.3 km s^-1^ Mpc^-1^ that is consistent with the data. This 6% decrease in the Hubble constant is consistent with the hypothesis that the Local Group inhabits an underdense region of the universe, but is also consistent with the best-fit value of H_0_ = 76 km s^-1^ Mpc^-1^ at the 1.5 {sigma} level. Subject headings: cosmological parameters-distance scale-galaxies: distances and redshifts-large-scale structure of universe
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