J/A+A/433/43 C-T1 phot. of NGC 4636 globular cluster system (Dirsch+, 2005) ================================================================================ A wide-field photometric study of the globular cluster system of NGC 4636. Dirsch B., Schuberth Y., Richtler T. =2005A&A...433...43D ================================================================================ ADC_Keywords: Clusters, globular ; Photometry, CMT1T2V Keywords: galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 4636 - galaxies: star clusters - galaxies: stellar content - galaxies: structure Abstract: Previous smaller-scale studies of the globular cluster system of NGC 4636, an elliptical galaxy in the southern part of the Virgo cluster, have revealed an unusually rich globular cluster system. We re-investigate the cluster system of NGC 4636 with wide-field Washington photometry. Description: The data set consists of Washington wide-field images obtained with the MOSAIC camera mounted at the prime focus of the CTIO 4-m Blanco telescope during 4 and 5 April 2002. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file tablea1.dat 34 16277 Point source positions, colors and magnitudes tablea2.dat 35 20 Color distribution of the globular cluster system of NGC 4636 tablea3.dat 85 22 Radial distribution of the globular cluster system of NGC 4636 tablea4.dat 56 34 Light profile and the dependence of position angle and ellipticity of NGC 4636 tablea5.dat 51 26 Power-law fits to the radial globular cluster distributions of elliptical galaxies tablea6.dat 53 17 Power-law fits to the luminosity profiles of selected galaxies -------------------------------------------------------------------------------- See also: J/AJ/127/2114 : Globular clusters around NGC 1399 (Dirsch+, 2004) Byte-by-byte Description of file: tablea1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 h RAh Right ascension (J2000.0) 4- 5 I2 min RAm Right ascension (J2000.0) 7- 11 F5.2 s RAs Right ascension (J2000.0) 13 A1 --- DE- Declination sign (J2000.0) 14 I1 deg DEd Declination (J2000.0) 16- 17 I2 arcmin DEm Declination (J2000.0) 19- 22 F4.1 arcsec DEs Declination (J2000.0) 24- 28 F5.2 mag C-T1 C-T1 colour index 30- 34 F5.2 mag T1mag T1 magnitude -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 F4.2 mag C-T1 Center of the color bin 9- 12 F4.1 --- N1 Number of clusters in a color bin with a width of 0.07mag within a radial distance of 3.6'-8.1' 15- 18 F4.1 --- e_N1 Statistical uncertainty of N1 22- 25 F4.1 --- N2 Number of clusters in a color bin with a width of 0.07mag within a radial distance of 8.1'-13.5' (1) 28- 31 F4.1 --- e_N2 Statistical uncertainty of N2 -------------------------------------------------------------------------------- Note (1): The negative values in N2 arose from the performed background correction. -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 F5.2 arcmin r Center of the radial distance bin in which the clusters are counted 9- 13 F5.2 arcmin-2 n1 Point sources density for objects with a color 0.9<(C-T1)<2.1 15- 18 F4.2 arcmin-2 e_n1 Statistical uncertainty of n1 22- 26 F5.2 arcmin-2 n2 Cluster sources density for objects with a color 0.9<(C-T1)<2.1 (n1 background corrected) 28- 31 F4.2 arcmin-2 e_n2 Statistical uncertainty of n2 35- 39 F5.2 arcmin-2 n3 Point sources density for objects with a color 0.9<(C-T1)<1.55 41- 44 F4.2 arcmin-2 e_n3 Statistical uncertainty of n3 48- 52 F5.2 arcmin-2 n4 Cluster sources density for objects with a color 0.9<(C-T1)<1.55 (n3 background corrected) 54- 57 F4.2 arcmin-2 e_n4 Statistical uncertainty of n4 61- 65 F5.2 arcmin-2 n5 Point sources density for objects with a color 1.55<(C-T1)<2.1 67- 70 F4.2 arcmin-2 e_n5 Statistical uncertainty of n5 74- 78 F5.2 arcmin-2 n6 Cluster sources density for objects with a color 1.55<(C-T1)<2.1 (n5 background corrected) 80- 83 F4.2 arcmin-2 e_n6 Statistical uncertainty of n6 -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 F4.2 arcmin r Radial distance 9- 13 F5.2 mag/arcsec2 t1 T1 surface brightness 16- 19 F4.2 mag/arcsec2 e_t1 Uncertainty of the T1 surface brightness 24- 27 F4.2 mag C-T1 ? C-T1 color of the galaxy 30- 33 F4.2 mag e_C-T1 ? Uncertainty of the C-T1 color 37- 39 I3 deg PA Position angle of the galaxy 41- 42 I2 deg e_PA Uncertainty of the position angle 47- 50 F4.2 --- eps Ellipticity of the galaxy 53- 56 F4.2 --- e_eps Uncertainty of the ellipticity -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 A7 --- Name Galaxy identifier 11- 16 F6.2 mag VMAG Absolute V-Luminosity 19- 22 F4.2 mag e_VMAG ? Uncertainty of the absolute V-Luminosity 27- 31 F5.2 --- alpha Power-law exponent of the cluster radial density distribution, n(r){prop.to}r^alpha^ 34- 37 F4.2 --- e_alpha Uncertainty of the power-law exponent 42- 51 A10 --- r_alpha Literature Source (1) -------------------------------------------------------------------------------- Note (1): Literature sources are coded as follows: KP97: Kissler-Patig, 1997A&A...319...83K KP97b: Kissler-Patig et al., 1997A&A...327..503K KP96: Kissler-Patig et al., 1996A&A...308..704K RZ01: Rhode & Zepf, 2001AJ....121..210R RZ03: Rhode & Zepf, 2004AJ....127..302R Fea91: Forte et al., 2001AJ....121.1992F Dea03a: Dirsch et al., 2003AJ....125.1908D Dea03b: Dirsch et al., 2003A&A...408..929D Gea01: Gomez et al., 2001A&A...371..875G Bea00: Brown et al., 2000MNRAS.317..406B OH02: Okon & Harris, 2002ApJ...567..294O -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea6.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 9 A9 --- Name Galaxy identifier 13- 18 F6.2 mag VMAG Absolute V-Luminosity 21- 24 F4.2 mag e_VMAG Uncertainty of the absolute V-Luminosity 29- 33 F5.2 --- alpha Power-law exponent of the fitted galaxy light profile 36- 39 F4.2 --- e_alpha Uncertainty on alpha 44- 47 F4.2 --- Dalpha ? Difference between the power-law exponent of the cluster radial distribution and the galaxy light profile 49- 52 F4.2 --- e_Dalpha ? Uncertainty on Dalpha -------------------------------------------------------------------------------- Acknowledgements: Boris Dirsch, borischacabuco(at)yahoo.co.uk ================================================================================ (End) Patricia Vannier [CDS] 16-Feb-2005