Astronomy and Astrophysics – Astronomy
Scientific paper
May 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19513703m&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #137.03; Bulletin of the American Astronomical Society, Vol. 32, p.885
Astronomy and Astrophysics
Astronomy
Scientific paper
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. We have re-observed NGC 4489, obtaining high signal-to-noise data at the KPNO 2.1m and the ESO/La Silla 3.5m NTT telescopes. Adopting the I-band SBF distance modulus determined by Tonry et al. (1990) and Tonry et al. (1997), we derive /line{M} KPNOK =-6.11+/- 0.24 and /line{M} KESO=-6.13+/- 0.13. Relative to the average /line{M} K derived for giant ellipticals by Jensen et al. 1998 (/line{M} K=-5.61+/- 0.2), we confirm the detection of an anomalous K-band SBF in NGC 4489 at the two sigma level. Such anomalous fluctuations could be caused by either intermediate-age AGB stars above the tip of the first-ascent giant branch or high-metallicity first-ascent giants. This result raises questions about the accuracy of K-band SBF distance measurements for elliptical galaxies with unknown stellar composition.
Mei Shan
Quinn Peter J.
Silva Ronaldo Da
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