Table 4
Galaxy distances from this work and from the literature.
| NGC 4621 | NGC 4374 | |||||
| Filter | Colour | Ref. Colour/Data |
|
m − M |
|
m − M |
|
|
||||||
| SBF from literature | ||||||
|
|
||||||
| I | V − I | [1] | 29.67 ± 0.18 | 31.16 ± 0.20 | 29.77 ± 0.09 | 31.16 ± 0.11 |
| z | g − z | [2] | 29.12a ± 0.01 | 30.86 ± 0.07 | 29.53a ± 0.01 | 31.34 ± 0.07 |
| K | ... | [3] | 25.46 ± 0.16 | ... | 25.43 ± 0.22 | ... |
| Our measurements | ||||||
| Empirical calibrationsb | ||||||
|
|
||||||
| V | V − I | [4] | 31.84 ± 0.06 | 30.91 ± 0.21 | 32.11 ± 0.04 | 31.08 ± 0.20 |
| R | B − R | [5] | 30.94 ± 0.08 | 31.05 ± 0.21 | 31.40 ± 0.08 | 31.25 ± 0.22 |
| Theoretical calibrations-SSPb | ||||||
|
|
||||||
| B | B − R | [6] | 32.83 ± 0.10 | 30.2 | 33.31 ± 0.08 | 30.5 |
| V | B − R | [6] | 31.84 ± 0.06 | 30.76 ± 0.21 | 32.11 ± 0.04 | 30.91 ± 0.20 |
| R | B − R | [6] | 30.94 ± 0.08 | 30.93 ± 0.21 | 31.40 ± 0.08 | 31.27 ± 0.22 |
| Theoretical calibrations-CSPb | ||||||
|
|
||||||
| V | V − I | [7] | 31.84 ± 0.06 | 30.99 ± 0.21 | 32.11 ± 0.04 | 31.17 ± 0.20 |
| R | V − I | [7] | 30.94 ± 0.08 | 31.04 ± 0.21 | 31.40 ± 0.08 | 31.41 ± 0.22 |
| Median m − M | ||||||
|
|
||||||
| NGC 4621 | NGC 4374 | |||||
| This work | 30.96 ± 0.11 | 31.21 ± 0.17 | ||||
| all SBFs | 31.08 ± 0.19 | 31.21 ± 0.14 | ||||
| No SBFs | 30.97 ± 0.21 | 31.17 ± 0.18 | ||||
| All available m − M | 30.98 ± 0.17 | 31.22 ± 0.16 | ||||
Notes.
Blakeslee et al. (2009) data are given in the AB-mag system.
We adopted ~0.2 mag as safe calibration error for i) distance moduli given in the literature with no calibration uncertainty; and ii) distances based on theoretical calibrations (see text).
References. [1] Tonry et al. (2001); [2] Blakeslee et al. (2009); [3] Pahre & Mould (1994); [4] Cantiello et al. (2007a); [5] Jerjen et al. (2004); [6] this work; [7] Blakeslee et al. (2001).
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