High K-band surface brightness fluctuations in NGC 1427 and NGC 720

Details High K-band surface brightness fluctuations in NGC 1427 and NGC 720 High K-band surface brightness fluctuations in NGC 1427 and NGC 720

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...376..793m&link_type=abstract

Astronomy and Astrophysics, v.376, p.793-802 (2001)

Astronomy and Astrophysics

Astrophysics

5

Galaxies: Distances, Individual: Ngc 1427, Ngc 720

Scientific paper

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 MK = -6.55 +/- 0.27 for NGC 1427 and MK = -6.43 +/- 0.18 for NGC 720. When using an average of direct distance measurements, we obtain MK = -6.17 +/- 0.23 for NGC 1427 and MK = -6.14 +/- 0.24 for NGC 720. For both galaxies, MK lies well above the average value used as a calibration for distance indication (MK = -5.61 +/- 0.12 Jensen et al. \cite{jen98}). 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 MK in several galaxies underline once more the need for a better understanding of MK as a function of stellar population properties (Mei et al. \cite{mei01b}; Liu et al. \cite{liu01}), especially with respect to the potential presence of intermediate-age populations. Based on observations performed at the European Southern Observatory, La Silla, Chile; ESO program No. 62.N-0568.

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