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Date and Time of the Query: 2019-05-21 T07:44:52 PDT
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For refcode 2001A&A...376..793M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2001A&A...376..793M High K-band surface brightness fluctuations in NGC 1427 and NGC 720 S. Mei, M. Kissler-Patig, D. R. Silva and P. J. Quinn Observatoiren Midi-Pyrenees, 14 Av. E. Belin, 31400 Toulouse, France European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany Received 31 October 2000/Accepted 6 July 2001 Abstract. We have observed K-band Surface Brightness Fluctuations (SBF) in NGC 1427 and NGC 720. We combine our measurements with distance measurements based on I-band SBF distance moduli and distance moduli derived by other distance indicators. When using distances from I-band SBF, we obtain M^bar^_K_ = -6.55 +/- 0.27 for NGC 1427 and M^bar^_K_ = -6.43 +/- 0.18 for NGC 720. When using an average of direct distance measurements, we obtain M^bar^_K_ = -6.17 +/- 0.23 for NGC 1427 and M^bar^_K_ = -6.14 +/- 0.24 for NGC 720. For both galaxies, M^bar^_K_ lies well above the average value used as a calibration for distance indication ( M^bar^_K = -5.61 +/- 0.12 Jensen et al. 1998). In NGC 720 the high K-band SBF are most probably due to an intermediate-age population. However, there is no hint from current data for any anomaly in the stellar population of NGC 1427. These large variations of M^bar^_K_ in several galaxies underline once more the need for a better understanding of M^bar^_K_ as a function of stellar population properties (Mei et al. 2001b; Liu et al. 2001), especially with respect to the potential presence of intermediate-age populations. Key words: galaxies: distances - individual: NGC 1427, NGC 720
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