Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..503s&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 107, no. 2, p. 503-512
Astronomy and Astrophysics
Astronomy
18
Astrometry, Astronomical Models, Brightness, Dimensional Measurement, Distance, Galactic Bulge, Stellar Luminosity, Surface Properties, Variations, Virgo Galactic Cluster, Charge Coupled Devices, Image Processing
Scientific paper
The distances to NGC 4565 and NGC 4494 have been measured using the surface brightness fluctuation method in the V band. By adopting a fluctuation magnitude bar-MV = +1.0, we have determined a distance modulus of 30.88+0.31-0.26(d = 15.0+2.3-1.7Mpc) for NGC 4494, and a distance of 30.08 +/- 0.07 (10.4+0.4-0.3Mpc) for NGC 4565. Both NGC 4494 and the bulge of NGC 4565 possess very similar colors, so that it is unlikely that differences in stellar population strongly affect these distance measurements. Previous studies of these two galaxies had suggested that they are both members of the Coma I group. Our measurements are incompatible with this hypothesis, but are in good agreement with Virgocentric infall models, which demonstrate that the difference in distances for NGC 4494 and NGC 4565 is probably due to the 'triple-value ambiguity' in the Virgocentric infall pattern.
Pritchet Chris J.
Simard Luc
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