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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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)
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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 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..832D 1993MNRAS.264..832D2
Note (4): Defined in Abraham et al., 1996, Cat. J/ApJS/107/1
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Acknowledgements: Pablo G. Perez Gonzalez
(End) Perez-Gonzalez P.G. [UCM], Patricia Bauer [CDS] 24-Nov-2000