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J/A+A/365/370       Photometry of UCM galaxies. II.      (Perez-Gonzalez+, 2001)

Optical photometry of the UCM Lists I and II. II. B band surface photometry and morphological discussion. Perez-Gonzalez P. G., Gallego J., Zamorano J., Gil de Paz A. <Astron. Astrophys. 365, 370 (2001)> =2001A&A...365..370P
ADC_Keywords: Galaxy catalogs ; Morphology ; Redshifts ; Photometry, surface Keywords: galaxies: photometry - galaxies: fundamental parameters - surveys - galaxies: spiral - galaxies: starburst - method: data analysis Description: We present Johnson B surface photometry for the UCM Survey galaxies. One-dimensional bulge-disk decomposition is attempted, discussing on fitting functions and computational procedures. The results from this decomposition, jointly with concentration indices and an asymmetry coefficient, are employed to study the morphological properties of these galaxies. We also compare our results with the previous morphological classification established using Gunn r imaging data and with other samples of galaxies. No major statistical differences in morphology are found between red and blue data, although some characteristics such as size and luminosity concentration vary. We find a correlation between luminosity and size. Several parameters are used to segregate the objects according to their morphological type. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 82 191 Bulge and disk parameters in the Johnson B band, bulge-to disk ratios, mean ellipticity and PA of the outer isophotes table3.dat 53 191 Concentration indices, isophote 24.5mag/arcsec2 data, effective surface brightness and asymmetry coefficient
See also: J/A+AS/141/409 : Photometry of UCM galaxies. I. (Perez-Gonzalez+, 2000) J/ApJS/95/387 : Universidad Complutense de Madrid list 1 (Zamorano+ 1994) J/ApJS/105/343 : Universidad Complutense de Madrid list 2 (Zamorano+ 1996) J/ApJS/122/415 : UCM list 3 (Alonso+, 1999) J/AJ/105/427 : IRAS fluxes of UCM galaxies (Rego+ 1993) J/A+AS/118/7 : Photometry + morphology of UCM galaxies (Vitores+, 1996) J/A+AS/120/323 : Long-slit spectroscopy of UCM galaxies (Gallego+ 1996) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- UCM UCM name 12- 16 F5.2 mag/arcsec2 mue ? Effective surface brightness of the bulge 18- 21 F4.2 mag/arcsec2 e_mue ? rms uncertainty on mue 23- 27 F5.2 arcsec re ? Effective radius of the bulge 29- 32 F4.2 arcsec e_re ? rms uncertainty on re 34- 38 F5.2 mag/arcsec2 mu0 ? Central surface brightness of the disk 40- 43 F4.2 mag/arcsec2 e_mu0 ? rms uncertainty on mu0 45- 49 F5.2 arcsec dL ? Disk scale 51- 54 F4.2 arcsec e_dL ? rms uncertainty on dL 56- 60 F5.2 --- B/D ? Bulge-to-disk ratio 62- 65 F4.2 --- e_B/D ? rms uncertainty on B/D 67- 70 F4.2 --- ell ? Mean ellipticity of the outer isophotes 72- 75 F4.2 --- e_ell ? rms uncertainty on ell 77- 79 I3 deg PA [-90/90]? Mean position angle of the outer isophotes 81- 82 I2 deg e_PA ? rms uncertainty on PA
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- UCM UCM name 12- 15 F4.2 --- c31 ? c31 concentration index. Mean error is 1% (1) 17- 20 F4.2 --- c42 ? c42 concentration index. Mean error is 2% (2) 22- 25 F4.2 --- cin ? cin concentration index. Mean error is 6% (3) 27- 31 F5.2 mag b24.5 ? B magnitude inside the 24.5mag/arcsec2 isophote. Mean error is 0.06mag 33- 36 F4.1 kpc r24.5 ? Radius of the 24.5 mag/arcsec2 isophote. Mean error is 11% 38- 42 F5.2 mag/arcsec2 mu24.5 ? Mean surface brightness inside the 24.5mag/arcsec2 isophote. Mean error is 0.06mag/arcsec2 44- 48 F5.2 mag/arcsec2 mue ? Mean effective surface brightness. Mean error is 0.02mag/arcsec2 50- 53 F4.2 % A ? Asymmetry coefficient. Mean error is 2% (4)
Note (1): Ratio between the radius containing 75% of the light of the galaxy and the radius with 25% of the galaxy luminosity .Defined in de Vaucouleurs, 1977, "Evolution of galaxies and stellar populations", eds. Larson & Tinsley Note (2): c42 = 5log(r80/r20), where r80 and r20 are the equivalent radii containing 80 and 20% of the total flux of the galaxy, respectively. Defined in Kent, 1985ApJS...59..115K Note (3): Cin(alpha)=({Int(0, alpha*r(muL)}rI(r)dr)/({Int(0, r(muL)}rI(r)dr) where muL is the detection threshold (set to 24.5,ag/arcsec2, mean valuer in our images) and α a parameter, 0<α<1, appropriately chosen (it was set to 0.3, optimal value). Defined in Doi et al., 1993MNRAS.264..832D2 Note (4): Defined in Abraham et al., 1996, Cat. J/ApJS/107/1
Acknowledgements: Pablo G. Perez Gonzalez
(End) Perez-Gonzalez P.G. [UCM], Patricia Bauer [CDS] 24-Nov-2000
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