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J/MNRAS/292/499     EFAR photometric data                    (Saglia+, 1997)

The peculiar motions of early-type galaxies in two distant regions - III. The photometric data. Saglia R.P., Burstein D., Baggley G., Bertschinger E., Colless M.M., Davies R.L., McMahan R.K.Jr, Wegner G. <Mon. Not. R. Astron. Soc. 292, 499 (1997)> =1997MNRAS.292..499S
ADC_Keywords: Galaxies, spectra ; Redshifts ; Velocity dispersion ; Photometry, CCD Keywords: galaxies: clusters: general - galaxies: distances and redshifts - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: photometry - large-scale structure of Universe Abstract: We present R-band CCD photometry for 776 galaxies observed in the EFAR (Elliptical FAR away) project. The photometry is compared with photoelectric data, showing that a common zero-point good to better than 1% and a precision of 0.03mag per zero-point have been achieved. We give the circularly averaged surface brightness profiles and the photometric parameters of the 762 program galaxies, D(n) diameters (at 20.5mag/arcsec2), half-luminosity radii Re, total magnitudes mT, and average effective surface brightnesses <SBe>. More than 80% of the profiles have a global S/N ratio larger than 300. The extrapolation needed to derive total magnitudes is less than 10% for 80% of the fits. More than 80% of the galaxies have mean effective surface brightness larger than the observed sky brightness. In 90% of the profiles the estimate of the contamination of the sky by the galaxy light is less than 1%. We derive total magnitudes and half-luminosity radii to better than 0.15mag and 25%, respectively, for 90% of our sample. In contrast, external comparisons show that data in the literature can be strongly affected by systematic errors due to large extrapolations, small radial range, sky subtraction errors, seeing effects, and the use of a simple R1/4 fit. The resulting errors can easily amount to more than 0.5mag in the total magnitudes and 50% in the half-luminosity radii. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table4.dat 183 762 Galaxy parameters notes.dat 79 27 Objects with problems
See also: J/ApJS/106/1 : EFAR cluster and galaxy selection (Wegner+, 1996) J/MNRAS/305/259 : EFAR galaxies redshifts + velocity dispersions (Wegner+ 1999) J/MNRAS/321/277 : EFAR peculiar velocities (Colless+, 2001) Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
2- 4 I3 --- GIN Galaxy Identification Number 6- 12 A7 --- Name Galaxy name 14- 16 A3 --- m_Name Multiplicity index on Name 18- 21 A4 --- Type Galaxy Type 23- 24 I2 --- Nimage Number of images 26 I1 ---- Nphot Number of photoelectric calibrations 28 I1 ---- Nccd Number of CCD calibrations 30- 31 I2 --- Nphoti Number of indirect photoelectric calibrations 33- 34 I2 --- Nccdi Number of indirect CCD calibrations 36- 37 I2 --- Nsecon Number of second order calibrations 39- 40 I2 --- Nthird Number of third order calibrations 42 I1 --- Nbad Number of bad calibrations 44 A1 --- n_Fit [*] Note on fit (1) 45- 48 A4 --- Fit Fit type (1) 50 I1 --- QE QE quality parameter of the fit 52 I1 --- QC Qχ2^_ quality parameter of the fit 54 I1 --- QR Qmax quality parameter of the fit 56 I1 --- QF QΓ quality parameter of the fit 58 I1 --- QN QS/N parameter quality parameter of the fit 60 I1 --- QS QδSky quality parameter of the fit 62 I1 --- QB QSky quality parameter of the fit 64 I1 --- Qtot Global quality of the fit (5) 66- 70 F5.2 arcsec Rap Radius of the aperture of the calibration magnitude Rmag 72- 76 F5.2 mag Rmag R-band calibration magnitude inside the aperture of radius Rap (kron-Cousins) 78- 82 F5.2 arcsec Dn Diameter of the galaxy 84- 87 F4.2 arcsec e_Dn ? Photometric calibration error on Dn 89- 93 F5.2 arcsec Re Half-luminosity radius 95- 99 F5.2 mag/arcsec+2 <SBe> Average effective surface brightness in Rmag/arcsec2 (2) 101-105 F5.2 mag BTot Total luminosity in R (3) 107-111 F5.2 mag/arcsec+2 SBe Effective surface brightness in Rmag/arcsec2 (2) 113-116 F4.2 mag/arcsec+2 e_SBe ? Photometric calibration error on SBe 118-122 F5.3 mag B-R ? B-R colour index from Colless et al. (1993MNRAS.262..475C) (4) 124-128 F5.3 mag AR R-band Galactic absorption 130-134 F5.3 mag KR R-band K correction 136-140 F5.3 mag KB B-band K correction 142-146 F5.3 --- KSB Cosmological surface brightness dimming correction 148 A1 --- note [*] *: no redshift is available 150-153 F4.2 --- h/Reb ? Ratio of Disk to Bulge scale-lengths 155-159 F5.2 --- D/B ? Disk to Bulge ratio of the fits 161-165 F5.2 arcsec ReB ? Half-luminosity radius of the Bulge component 167-171 F5.2 mag/arcsec2 mueB ? Surface brightness at ReB in Rmag/arcsec2 of the Bulge component (2) 173-177 F5.2 arcsec h ? Exponential scale-length of the Disk component 179-183 F5.2 mag/arcsec2 mu0 ? Central surface brightness in Rmag/arcsec2 of the Disk component (2)
Note (1): the fit type is indicated as follows: B = R1/4 law fit D = exponential fit BD = R1/4 plus exponential fit N = if also specified, the mean sky correction has been set to zero rather than using the algorithm sky correction * = marks the two-component fits where the fitted exponential component should not be interpreted as a physical disk Note (2): Galactic absorption corrections, KR corrections and corrections for cosmological dimming have been applied Note (3): Galactic absorption and KR corrections have been applied Note (4): B-R index including Galactic absorption and KR, KB corrections. The photoelectric magnitudes given in Colless et al. (1993MNRAS.262..475C) of GIN=117, 266, 687, 695, 697, 733 have been discarded because a star is in the aperture. Note (5): The Q parameter of the following galaxies has been downgraded: GIN=175, 182, 338, 527, 657
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 3 I3 --- GIN Galaxy Identification Number 5- 79 A75 --- Note Text of the note
Acknowledgements: Matthew Colless References: Wegner et al., Paper I 1996ApJS..106....1W, Cat. J/ApJS/106/1 Wegner et al., Paper II 1999MNRAS.305..259W, Cat. J/MNRAS/305/259 Saglia et al., Paper IV 1997ApJS..109...79S Colless et al., Paper V 1999MNRAS.303..813C Saglia et al., Paper VI 2001MNRAS.324..389S Colless et al., Paper VII 2001MNRAS.321..277C, Cat, J/MNRAS/321/277
(End) Patricia Bauer [CDS] 04-Oct-1999
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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