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J/A+A/369/812   UVKs photometry of globular clusters in NGC 5128 (Rejkuba, 2001)

Deep VLT search for globular clusters in NGC 5128 : Color-magnitude diagrams and globular cluster luminosity function. Rejkuba M. <Astron. Astrophys. 369, 812 (2001)> =2001A&A...369..812R
ADC_Keywords: Clusters, globular ; Photometry Keywords: galaxies: star clusters - galaxies: formation - galaxies: individual: NGC 5128 Abstract: At the distance of NGC 5128 (3.6±0.2Mpc) it is possible to resolve globular clusters with high resolution imaging from the ground, thus allowing the globular cluster candidate selection primarily through their morphological properties. I report the discovery of 71 globular clusters in NGC 5128 on VLT UT1+FORS1 images, including the faintest members (MV~-5) known to date in this galaxy as well as in 5 previously-known clusters. U- and V-band photometry has been measured for all the candidates and the luminosity function, spanning -10.1<MV←4.9 and -9.3<MU←3.3, constructed. These are the deepest globular cluster luminosity functions in an elliptical galaxy determined so far. The Kolmogorov-Smirnov statistics show that the difference between the globular cluster luminosity functions of NGC 5128 and the Milky Way is not larger than the difference between the ones of M 31 and the Milky Way. The (U-V)0 color histogram shows a bimodal distribution. For 23 globular clusters I obtained K-band images with SOFI at the NTT in La Silla. Their positions in the (U-V) vs. (V-K) color-color diagram indicate that they are indeed old globular clusters. Assuming that the globular clusters in NGC 5128 span a similar age range as the ones in the Milky Way and adopting a linear fit between the metallicity and (U-V)0 color, the metal-rich clusters peak at [Fe/H]=-0.6dex and the metal-poor ones peak at [Fe/H]=-1.7dex. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 108 78 Coordinates, photometry, FWHM (fV and fU), ellipticities (ellV and ellU) and projected galactocentric distance of globular cluster candidates table4.dat 102 53 Same as table3, but for other extended objects, some of which might well be globular clusters
Table 2: Comparison with the data from literature -------------------------------------------------------------------------------- ID1 ID2 Bpg Vpg VWash VWFI (U-V) [R2001b] [VHH81] -------------------------------------------------------------------------------- f1.GC-13 C36 19.04 18.24 18.27 18.39 0.91 f1.GC-16 C37 19.24 18.17 18.46 18.47 1.33 f1.GC-23 C38 19.00 18.40 1.16 f2.GC-26 C15 19.76 18.62 18.58 1.40 f2.GC-81 C12 18.82 17.74 17.79 18.01 1.47 -------------------------------------------------------------------------------- Notes: ID2: numbering from Hesser et al., 1984ApJ...276..491H and 1986ApJ...303L..51H, [VHH81] NN in Simbad Bpg and Vpg: photographic plate measurements of five clusters in Hesser et al. (1986ApJ...303L..51H, 1984ApJ...276..491H) VWash: Washington photometry in Harris et al. (1992AJ....104..613H) VWFI and (U-V): This work measurements (WFI = Wide Field Imager). Byte-by-byte Description of file: table3.dat table4.dat
Bytes Format Units Label Explanations
1- 8 A8 --- [R2001b] Object name 10- 11 I2 h RAh Right ascension (J2000) 12 A1 --- --- [:] 13- 14 I2 min RAm Right ascension (J2000) 15 A1 --- --- [:] 16- 20 F5.2 s RAs Right ascension (J2000) 22 A1 --- DE- Declination sign (J2000) 23- 24 I2 deg DEd Declination (J2000) 25 A1 --- --- [:] 26- 27 I2 arcmin DEm Declination (J2000) 28 A1 --- --- [:] 29- 32 F4.1 arcsec DEs Declination (J2000) 34- 38 F5.2 mag Vmag Bessel V magnitude 40- 43 F4.2 mag e_Vmag rms uncertainty on Vmag 45- 49 F5.2 mag Umag Bessel U magnitude 50 A1 --- u_Umag Uncertainty flag on Umag 52- 55 F4.2 mag e_Umag rms uncertainty on Umag 56 A1 --- ueUmag Uncertainty flag on e_Umag 57- 61 F5.2 mag Ksmag ? Ks magnitude 63- 66 F4.2 mag e_Ksmag ? rms uncertainty on Ksmag 68- 71 F4.2 pix FWMHV ? V-band FWHM (1 pix = 0.2") 73- 76 F4.2 pix FWMHU ? U-band FWHM (1 pix = 0.2") 77 A1 --- u_FWMHU Uncertainty flag on FWMHU 79- 82 F4.2 --- ellV ? Ellipticity in V 84- 87 F4.2 --- ellU ? Ellipticity in U 88 A1 --- u_ellU Uncertainty flag on eU 90- 94 F5.2 kpc R Projected galactocentric distance 96-102 A7 --- Note Note (1)
Note (1): Comments: b = near bright (saturated) star e = near edge of the field u = marginal or no detection v = object saturated in V; V mag from WFI data n = object does not satisfy all the criteria for globular cluster classification
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 10-Sep-2001
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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