Construction of a Self-consistent Reference Dataset
Spanning 8th to 18th mag.
Christopher Ke-shih Young
, PASA, 18 (2), in press.
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Title/Abstract Page: Total Magnitudes of Virgo
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Intermediate galaxy sample (14th-12th mag.)
Designation | VCC type/ | Ut | U25-Ut | (U-B) |
| aperture | (U-B) | Bt |
VPC/other | membership | (mag.) | (mag.) | (mag.) | (mag.) | (arcsec) | source | (mag.) |
178/NGCÒš4305 | Sa/M | 13.54 | 0.61 | 0.30 | 0.1 | 142.7 | SV96 | 13.24 |
328/NGCÒš4352 | S0/M | 13.87 | 0.37 | 0.39 | 0.03 | 34.5 | RC3e | 13.48 |
Òš | Òš | Òš | Òš | 0.40 | 0.06 | RC3T | Òš | |
532/NGCÒš4431 | dS0/M | 14.43 | 0.33 | 0.43 | 0.07 | RC3T | 14.00 | |
544/NGCÒš4436 | dE-dS0/M | 14.49 | 0.38 | 0.30 | 0.05 | 40.6 | RC3e | 14.19 |
Òš | Òš | Òš | Òš | 0.29 | 0.07 | RC3T | Òš | |
665/NGCÒš4468 | S0-Sa/M | 14.16 | 0.40 | 0.33 | 0.1 | 89.3 | SV96 | 13.83 |
Òš | Òš | Òš | Òš | 0.34 | 0.02 | 54.7 | RC3e | Òš |
Òš | Òš | Òš | Òš | 0.33 | 0.03 | RC3T | Òš | |
778/NGCÒš4491 | SBa | 13.89 | 0.19 | 0.25 | 0.1 | 89.3 | SV96 | 13.64 |
820/NGCÒš4497 | SB0-SBa/M | 13.79 | 0.23 | 0.34 | 0.1 | 89.3 | SV96 | Òš |
Òš | Òš | Òš | Òš | 0.29 | 0.06 | 62.8 | RC3e | 13.50 |
Òš | Òš | Òš | Òš | 0.25 | 0.06 | RC3T | Òš | |
838/ICÒš797 | SBc/M | 13.83 | 0.11 | -0.05 | 0.1 | 89.3 | SV96 | 13.88 |
855/NGCÒš4506 | S(pec)/M | 13.94 | 0.42 | 0.23 | 0.1 | 142.7 | SV96 | 13.71 |
865/ICÒš3470 | dE/M | 15.18 | 0.21 | 0.36 | 0.1 | 32.0 | WT73 | 14.82 |
885/ICÒš3481 | E(pec)/B | 14.54 | 0.86 | 0.55 | 0.04 | 25.6 | RC3e | 13.99 |
Òš | Òš | Òš | Òš | 0.51 | 0.04 | RC3T | Òš | |
918/ICÒš3499 | E-S0/M | 14.74 | 0.17 | 0.25 | 0.05 | RC3T | 14.49 | |
948/NGCÒš4531 | Sa(pec)/M | 12.90 | 0.26 | 0.32 | 0.1 | 142.7 | SV96 | 12.58 |
- Notes: (1) Membership assignments are based on radial velocities: M (for member) if less than 3500 km ; otherwise B (for background). (2) The sources of (U-B) measurements are: WT73 for Tifft (1973); RC3 for de Vaucouleurs et al. (1991) (e for effective colour, T for total colour); and SV96 for SchrÓÆder & Visvanathan (1996). When the (U-B) values listed are simply those corresponding to the largest aperture quoted by a particular source,
has been arbitrarily set to 0.1 mag. (3) The quantity `aperture' is strictly only applicable to the SV96 and WT73 measurements. In the case of the RC3e measurements, the quoted values are the effective diameters (Ae/arcsec in the notation of the RC3). Although the RC3T measurements are based on extrapolations to infinite radial distances, they may suffer from systematic errors as demonstrated by Young et al. (1998). The new Bt values are therefore only based on RC3T measurements when alternative measurements are unavailable. (4) In order to minimise possible errors due to colour gradients not being taken into account, the new Bt value for NGCÒš4468 was based on the aperture measurement made with the largest aperture. In the case of NGCÒš4497 however, owing to considerable scatter in the published (U-B) measurements, a median (U-B) value was adopted instead.
In the light of the high level of consistency found between Bt values derived from the VPC's U and BJ-band photometry for faint objects, another literature search was conducted for (U-B) colours for those 48 objects with unsaturated U-band but saturated BJ-band photometry. The apparent brightnesses of these galaxies lie within the range
mag. Those 13 objects for which colours could be found are listed in TableÒš2, together with newly derived Bt estimates for them.
Next Section: Bright galaxy sample (14th-8th
Title/Abstract Page: Total Magnitudes of Virgo
Previous Section: Faint galaxy sample (18th-14th
Ò? Copyright Astronomical Society of Australia 1997