Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4918w&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #49.18; Bulletin of the American Astronomical Society, Vol. 24, p.811
Other
Scientific paper
Preliminary results of a surface brightness fluctuation analysis using CCD images obtained in the Washington (CMT_1T_2) photometric system will be presented. The Washington system was designed to provide efficient and accurate measurements of abundances and temperatures for G and K giants. These are expected to be the dominant source of brightness fluctuations in ellipticals and spiral bulges. Deep CCD images of NGC 1379 (E0), NGC 6861 (S0), and NGC 6868 (E2), obtained at CTIO as part of another research project, have been used as the data for this investigation. Images were taken using C (lambda_ {eff} = 3910 Angstroms), M (lambda_ {eff} = 5080 Angstroms), and T_1 (lambda_ {eff} = 6330 Angstroms) filters. Preliminary results for NGC 6861 with the T_1 images show significant obscuration extending out to about 1 arcmin ( ~ 10 kpc using H_o = 75 km\ s(-1) Mpc(-1) ) from the galaxy center, which effectively prevents any useful brightness fluctuation information being obtained from this galaxy. Neither NGC 1379 nor NGC 6868 shows any indications of dust, however, and the analysis is proceeding for these two remaining galaxies. Both show a relatively smooth surface brightness distribution which is necessary for this type of analysis. Distance estimates will be presented for both NGC 1379 and NGC 6868 based on the T_1 and M images, and possibly on the C images. In addition, a discussion of the dust distribution in the inner 1 arcmin of NGC 6861 will be given.
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