Table 4.
Main properties for NGC 3640 and NGC 3641.
| Quantity | Galaxy | Note | |
|---|---|---|---|
| (units) | NGC 3640 | NGC 3641 | |
| RA (deg) | 170.278542 | 170.286725 | (1) |
| Dec. (deg) | 3.234833 | 3.194593 | (2) |
| Morphology | E3 | E | (3) |
| vhel (km s−1) | 1296 ± 5 | 1789 ± 5 | (4) |
| D (Mpc) | 27 ± 2 | 27 ± 3 | (5) |
| Re (arcsec) | 30.9 | 9.33 | (6) |
| mV (mag) | 10.4 ± 0.1 | 13.2 ± 0.2 | (7) |
| mz (mag) | 9.787 ± 0.002 | 12.499 ± 0.002 | (8) |
| MV (mag) | −21.7 ± 0.2 | −19 ± 0.3 | (9) |
| Mz (mag) | −22.4 ± 0.2 | −19.7 ± 0.3 | (10) |
 (mag) |
1.14 ± 0.2 | 0.9 ± 0.3 | (11) |
 (mag) |
1.12 ± 0.2 | 0.9 ± 0.3 | (12) |
Notes: (1)-(2) coordinates taken from NASA/IPAC Extragalactic Database (NED); (3) morphological type taken from de Vaucouleurs (1991); (4) heliocentric velocity taken from Cappellari et al. (2011); (5) distance of the two galaxies obtained from the SBF measurements reported in Tully et al. (2009, 2023); (6) effective radii taken from Cappellari et al. (2011); (7) apparent magnitude in the V-band taken from Gil de Paz et al. (2007); (8) apparent magnitude in the z-band taken from the Sloan Digital Sky Survey (Abazajian et al. 2009); (9)-(10) absolute magnitudes in the V- and z-bands assuming the apparent magnitudes in (7)-(8) and distances in (5); (11)-(12) expected widths of the luminosity function in the g- and z-bands, estimated using Eqs. (4) and (5) in Villegas et al. (2010).
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