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Observations of surface-brightness fluctuations in Virgo
- Source :
- Astronomical Journal. 100
- Publication Year :
- 1990
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1990.
-
Abstract
- VRI photometric observations of surface-brightness fluctuation in 13 Virgo Cluster galaxies, M32, and NGC 3379, obtained using an 800 x 800 CCD array on the 4-m telescope at KPNO during March 1989, are reported. The data-reduction techniques are described in detail, and the results are presented in tables and graphs. Particular attention is given to distance estimates derived from the I-band fluctuations: it is shown that NGC 4365 is behind the cluster, while NGC 4468 and NGC 4489 are in the foreground. The average distance to the cluster is found to be 17 + or - 1 Mpc, with H0 = 78 + or - 6 km/sec Mpc; the corresponding values from a direct isochrone calibration are 21 Mpc and 64 + or - 5 km/sec Mpc.
- Subjects :
- Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00046256
- Volume :
- 100
- Database :
- NASA Technical Reports
- Journal :
- Astronomical Journal
- Notes :
- NSG-7643, , NSF AST-83-18504, , NSF AST-89-58065
- Publication Type :
- Report
- Accession number :
- edsnas.19910029655
- Document Type :
- Report
- Full Text :
- https://doi.org/10.1086/115606