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Date and Time of the Query: 2019-04-23 T19:16:14 PDT
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For refcode 2009ApJ...694..556B:
Retrieve 134 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2009ApJ...694..556B The ACS Fornax Cluster Survey. V. Measurement and Recalibration of Surface Brightness Fluctuations and a Precise Value of the Fornax-Virgo Relative Distance Blakeslee, John P.; Jordan, Andres; Mei, Simona; Cote, Patrick; Ferrarese, Laura; Infante, Leopoldo; Peng, Eric W.; Tonry, John L.; West, Michael J. Abstract. We present (g_475_ - z_850_) color and z_850_-band surface brightness fluctuations (SBFs) measurements for 43 early-type galaxies in the Fornax cluster imaged with the Hubble Space Telescope Advanced Camera for Surveys. These are combined with our earlier measurements for Virgo cluster galaxies to derive a revised, nonlinear calibration of the z_850_-band SBF absolute magnitude ^bar^M_z as a function of (g_475_ - z_850_) color, valid for the AB color range 0.8 < (g_475_ - z_850_) < 1.6. In all, we tabulate recalibrated SBF distances for 134 galaxies in Virgo, Fornax, the Virgo W' group, and NGC 4697 in the Virgo Southern Extension. The calibration procedure yields a highly precise relative distance modulus for Fornax with respect to Virgo of {DELTA}(m - M)_ FV_ = 0.42 +/- 0.03 mag, or a distance ratio d_F_ /d_V_ = 1.214 +/- 0.017. The resulting Fornax distance modulus is (m - M)_For_ = 31.51 +/- 0.03 +/- 0.15 mag, corresponding to d_F_ = 20.0 +/- 0.3 +/- 1.4 Mpc, where the second set of error bars reflects the total systematic uncertainty from our assumed Virgo distance of 16.5 Mpc. The rms distance scatter for the early-type Fornax cluster galaxies is {sigma}_ d_ = 0.49^+0.11^_-0.15_ Mpc, or a total line-of-sight depth of 2.0^+0.4^_-0.6_ Mpc, consistent with its compact appearance on the sky. This translates to a depth scatter smaller than the intrinsic, or "cosmic," scatter {sigma}_cos_ in the SBF calibration, unlike the case for the larger Virgo cluster. As a result, we are able to place the first tight constraints on the value of {sigma}_cos_. We find {sigma}_cos_ = 0.06 +/- 0.01 mag, with a firm upper limit of {sigma}_cos_ < 0.08 mag, for the subsample of galaxies with (g_475_ - z_850_)>1.02, but it is about twice as large for bluer galaxies. We also present an alternative SBF calibration based on the "fluctuation count" parameter ^bar^N= ^bar^m- m_tot, a proxy for galaxy mass. This gives a consistent relative distance but with larger intrinsic scatter, and we adopt the result from the calibration on (g_475_ - z_850_) because of its basis in stellar population properties alone. Finally, we find no evidence for systematic trends of the galaxy distances with position or velocity (e.g., no current infall); the Fornax cluster appears both compact and well virialized. Key words: galaxies: clusters: individual: Fornax Virgo, galaxies: distances and redshifts, galaxies: elliptical and lenticular, cD, large-scale structure of universe
Retrieve 134 NED objects in this reference.
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