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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 183 762 Galaxy parameters
notes.dat 78 27 Objects with problems
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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
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Bytes Format Units Label Explanations
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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 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)
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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 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
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- GIN Galaxy Identification Number
5- 79 A75 --- Note Text of the note
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Acknowledgements: Matthew Colless
References:
Wegner et al., Paper I 1996ApJS..106....1W 1996ApJS..106....1W, Cat. J/ApJS/106/1
Wegner et al., Paper II 1999MNRAS.305..259W 1999MNRAS.305..259W, Cat. J/MNRAS/305/259
Saglia et al., Paper IV 1997ApJS..109...79S 1997ApJS..109...79S
Colless et al., Paper V 1999MNRAS.303..813C 1999MNRAS.303..813C
Saglia et al., Paper VI 2001MNRAS.324..389S 2001MNRAS.324..389S
Colless et al., Paper VII 2001MNRAS.321..277C 2001MNRAS.321..277C, Cat, J/MNRAS/321/277
(End) Patricia Bauer [CDS] 04-Oct-1999