Tip of the Red Giant Branch Distances to NGC 4214, UGC 685, and UGC 5456
نویسندگان
چکیده
منابع مشابه
Tip of the Red Giant Branch Distances to NGC 4214 , UGC 685 , and UGC 5456 1
We have used WFPC2 V RI observations to calculate the distances to three nearby galaxies, NGC 4214, UGC 685, and UGC 5456 using the tip of the red giant branch method. Our values for NGC 4214 (2.94 ± 0.18 Mpc) and UGC 685 (4.79 ± 0.30 Mpc) are the most precise measurementes of the distances to these objects ever made. For UGC 5456 the data do not allow us to reach a decisive conclusion since th...
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We have determined the distance to NGC 4258 using observations made with the Hubble Space Telescope (HST) and the Wide Field, Advanced Camera for Surveys (ACS/WFC). We apply a modified technique that fully accounts for metallicity effects on the use of the luminosity of the tip of the red giant branch (TRGB) to determine one of the most precise TRGB distance moduli to date: μ(TRGB) = 29.28± 0.0...
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The accurate determination of galaxy relative distances is extremely important for the empirical calibration of the uncertain metallicity dependence of some standard candles like Cepheid stars, or for studying the galaxy space distribution and peculiar velocities. Here we have investigated the reliability of the widely used I-band Tip of the Red Giant Branch (TRGB) relative distances for a samp...
متن کاملTip of the Red Giant Branch Distances. I. Optimization of a Maximum Likelihood Algorithm
Accurate distances to galaxies can be determined from the luminosities of stars at the Tip of the Red Giant Branch (TRGB). We use a Maximum Likelihood algorithm to locate the TRGB in galaxy color-magnitude diagrams. The algorithm is optimized by introducing reliable photometric errors and a completeness characterization determined with artificial star experiments. The program is extensively tes...
متن کاملDistance , structure and bright stellar content of the dwarf irregular galaxy UGC 685
B and R CCD images and J NICMOS3 frames taken with the Calar Alto 3.5m telescope of the dwarf irregular galaxy UGC 685 are presented. The brightest part of the stellar population is resolved in B and R, very few also in J. The stellar color-magnitude diagram is discussed. An estimate of the distance to UGC 685 of 5.5 Mpc is derived based on the brightest blue supergiant stars. Most of the resol...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2002
ISSN: 0004-6256,1538-3881
DOI: 10.1086/338853