NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-23 T18:56:46 PDT
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For refcode 2001A&A...366...54M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2001A&A...366...54M Anomalous surface brightness fluctuations in NGC 4489. MEI S., SILVA D.R., QUINN P.J. Received 18 February 2000/Accepted 30 October 2000 Abstract. Anomalously high K-band surface brightness fluctuations (SBF) have been reported in NGC 4489 by Pahre & Mould (1994), Jensen et al. (1996) and Jensen et al. (1998). However, these conclusions were uncertain because of relatively low signal-to-noise data. New high signal-to-noise data for NGC 4489 have been obtained at the NOAO/KPNO 2.1 m and the ESO/La Silla 3.5 m NTT telescopes. Adopting the I-band SBF distance modulus determined by Tonry et al. (2000b) and the <M>_I_ versus (V-I) calibration of Tonry et al. (2000a), a value of <M>_K_ =- 6.29+/-0.10 mag was derived. Relative to the average empirical <M>_K_ derived for giant ellipticals by Jensen et al. (1998) (<M>_K_=-5.6+/-10.12 mag), the detection of an anomalous K-band SBF in NGC 4489 is confirmed at the two sigma level. Such anomalous fluctuations could be caused by an extended giant branch, consisting of either intermediate-age AGB stars above the tip of the first- ascent giant branch or high-metallicity first-ascent giants, or by lack of a full understanding of the K-band SBF calibration. This result raises questions about the accuracy of K-band SBF distance measurements for elliptical galaxies with unknown stellar composition and underscores the need for <M>_K_ measurements over a larger range of color and luminosity. Key words: galaxies: distances and redshift - individual: NGC 4489
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