| Title | Optical Surface Brightness Fluctuations of Shell Galaxies toward 100 Mpc |
| Authors | Biscardi, I.; Raimondo, G.; Cantiello, M.; Brocato, E. |
| Bibcode | 2008ApJ...678..168B Search ADS ↗ |
| Abstract | We measure F814W surface brightness fluctuations (SBFs) for a sample of distant shell galaxies with radial velocities ranging from 4000 to 8000 km s-1. The distance at galaxies is then evaluated by using the SBF method. For this purpose, theoretical SBF magnitudes for the HST ACS filters are computed for single-burst stellar populations covering a wide range of ages (t = 1.5-14 Gyr) and metallicities (Z = 0.008-0.04). Using these stellar population models, we provide the first bar MF814W versus (F 475W - F 814W)0 calibration and we extend the previous M1 versus (B - I)0 color relation to colors (B - I)0 <= 2.0 mag. Coupling our SBF measurements with the theoretical calibration we derive distances with a statistical uncertainty of ~8%, and systematic error of ~6%. The procedure developed to analyze data ensures that the indetermination due to possible unmasked residual shells is well below ~12%. The results suggest that optical SBFs can be measured at d >= 100 Mpc with HST ACS imaging. SBF-based distances coupled with recession velocities corrected for peculiar motion, allow us obtain H0 = 76 +/- 6 (statistical) ±5 (systematic) km s-1 Mpc-1. |
| Objects | 10 Objects Search NED ↙ |
