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VII/225B            The Canada-France Redshift Survey (CFRS)      (Lilly+, 1995)

The Canada-France Redshift Survey Lilly S.J., Le Fevre O., Crampton D., Hammer F., Tresse L. <Astrophys. J. 455, 50; 455, 60; 455, 75; 455, 88; 455, 96 (1995)> =1995ApJ...455...50L =1995ApJ...455...60L =1995ApJ...455...75L =1995ApJ...455...88H =1995ApJ...455...96C
ADC_Keywords: Galaxies, photometry ; Galaxies, spectra ; Redshifts Keywords: galaxies: distances and redshifts - techniques: spectroscopic Description: The Canada-France Redshift Survey (CFRS) is a collaboration between astronomers in Canada and France: Simon Lilly (University of Toronto), Olivier Le Fevre and Francois Hammer (Observatoire de Paris Meudon), David Crampton (Dominion Astrophysical Observatory, Victoria), Laurence Tresse (Cambridge University), and David Schade and Dan Hudon (University of Toronto). The survey is based primarily on observations with the 3.6m Canada-France-Hawaii Telescope (CFHT) on Mauna Kea, Hawaii. The CFRS consists of spectra of over 1000 faint objects selected to have 17.5 < I(AB) < 22.5 in five regions of sky. The survey is providing the first systematic study of normal galaxies at redshifts z > 0.5, corresponding to look-back times of greater than 50% of the age of the Universe. Observations of CFRS galaxies have also been made with the Hubble Space Telescope and the survey will form the basis of future studies with a number of other ground-based and space facilities. We have written a lay-persons guide to the CFRS and the main scientific results that are emerging from it. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 124 1010 The Canada-France Redshift Survey catalogue
See also: : The CFRS Home Page J/ApJ/464/79 : CFRS XI: High-redshift field galaxies morphology (Schade+ 1996) J/ApJ/481/49 : CFRS XIV. Field galaxies up to z=1 (Hammer+ 1997) J/ApJ/517/148 : ISO observations of the CFRS field (Flores+, 1999) J/AJ/122/621 : Galaxy morphology in the CFRS (van den Bergh, 2001) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 7 A7 --- CFRS CFRS identification number (6) 8 A1 --- f_CFRS [*] when the galaxy appears in the parts XI/XIV (catalogs J/ApJ/464/79 or J/ApJ/481/49) 10- 11 I2 h RAh Right ascension (J2000) (1) 13- 14 I2 min RAm Right ascension (J2000) 16- 20 F5.2 s RAs Right ascension (J2000) 22 A1 --- DE- Declination sign (J2000) 23- 24 I2 deg DEd Declination (J2000) 26- 27 I2 arcmin DEm Declination (J2000) 29- 32 F4.1 arcsec DEs Declination (J2000) 35- 39 F5.2 mag Imag Isophotal IAB (see CFRS-I, 1995ApJ...455...50L) 42- 46 F5.2 mag V-I ?=99.99 (V-I)AB colour in 3 arcsec aperture (see CFRS-I, 1995ApJ...455...50L) 49- 53 F5.2 --- Q Image compactness parameter Q (1 = star) (see CFRS-I, 1995ApJ...455...50L) (2) 56- 61 F6.4 --- z ?=9.999 Redshift (0.000=star) (3) 64- 65 I2 --- Class Confidence class of spectroscopic identification (4) 68- 71 I4 0.1nm Lam1 ? Spectroscopic feature (5) 72 A1 --- Cont1 [12Ca?]? Spectroscopic feature (5) 73- 76 I4 0.1nm Lam2 ? Spectroscopic feature (5) 77 A1 --- Cont2 [1Cb?]? Spectroscopic feature (5) 78- 81 I4 0.1nm Lam3 ? Spectroscopic feature (5) 82 I1 --- Cont3 [1]? Spectroscopic feature (5) 83- 86 I4 0.1nm Lam4 ? Spectroscopic feature (5) 87 A1 --- Cont4 [1a?]? Spectroscopic feature (5) 88- 91 I4 0.1nm Lam5 ? Spectroscopic feature (5) 92- 93 A2 --- Cont5 [1a? ]? Spectroscopic feature (5) 94- 97 I4 0.1nm Lam6 ? Spectroscopic feature (5) 98 A1 --- Cont6 [1] Spectroscopic feature (5) 99-102 I4 0.1nm Lam7 ? Spectroscopic feature (5) 104-107 I4 0.1nm Lam8 ? Spectroscopic feature (5) 109-124 A16 --- Com Comments
Note (1): These should be accurate to about 1 arcsec or better (see CFRS-I, 1995ApJ...455...50L) Note (2): The Q parameter (Le Fevre et al., 1986A&A...154...92L) represents the inverse of the ratio of central surface brightness of the object in question and a star of the same isophotal magnitude. Note (3): The r.m.s. redshift uncertainty is 0.0013 (see CFRS-III, 1995ApJ...455...75L) Note (4): This is quite involved but is essential for the successful use of the catalogue. Nearly all the CFRS spectra were reduced and identified independently by three individuals before a final identification was made. The Confidence Class represents the consensus confidence of these three individuals in the correctness of the final identification (see CFRS-II, 1995ApJ...455...60L) Classes 0-4 represent normal stars and galaxies, with increasing levels of confidence in the identification: 1: probability of 50% that the measurement was correct 2: probability of more than 75% that the measurement was correct 3: measurement at least 95% secure 4: unquestionably correct identification Class 8 represents a single line redshift in which the continuum shape around the line supports its identification with [OII] 3727 (see CFRS-III, 1995ApJ...455...75L) Class 9 represents a single line redshift in which the continuum test could not be done, or (rarely) where it gave ambiguous results. The line is assumed to be [OII] 3727. One of the above notations plus 10 (e.g. 14) indicates that the object had broad emission lines and is thus presumably a QSO or broad-line AGN. One of the above notations plus 90 (e.g. 94) indicates that the object is in the "supplementary" catalogue. Objects went in to the supplementary catalogue if a redshift had been measured but the spectrum would otherwise have been rejected for one of a number of objective (and quantified) observational reasons (see CFRS-II, 1995ApJ...455...60L): (a) Spectrum on CCD defect. (b) Object too near the end of slit. (c) Object displaced off of slit. (d) Reexamination of photometry resulted in magnitude below survey limit. Objects in the supplementary catalogue are liable to be biased towards "easy" objects. No such bias should be present in the remaining "statistically complete" catalogue. Repeated observations of objects (independently reduced and identified) confirmed our a priori assent of probabilities that individual spectroscopic identifications were CORRECT (see CFRS-III, 1995ApJ...455...75L) ------------------------------------------------------------ Class fraction confirmation of sample rate ------------------------------------------------------------ Class 4 35% 100% Class 8 3% 100% (the line was always confirmed) Class 9 3% 100% (the line was always confirmed) Class 3 33% 97% Class 2 10% 80% ---------------- Class 1 5% 50% Class 0 10% - ------------------------------------------------------------ In all the CFRS science analyses, the Class 1 unreliable "identifications" have been treated as being "unidentified" Note (5): Features noted in the spectra. These are largely self-explanatory, Note (5): Features noted in the spectra. These are largely self-explanatory, except that a "1" indicates that the continuum shape supported the identification in cases in which the number of distinct features was small and a "2" indicates the multiple features of an M star. C indicates continuum b indicates break a for 4863a line ? for uncertainty It should be noted that the listed features were "seen" at the indicated redshift. They are not necessarily all of such strength as to significantly confirm the redshift. Note (6): the CFRS identification is of the form HH.NNNN, where HH represents the field hour: 00 for the field at 0000-00 (1995ApJ...455...60L, 90 sources) 03 for the field at 0300+00 (1995ApJ...455...88H, 272 sources) 10 for the field at 1000+25 (1995ApJ...455...60L, 210 sources) 14 for the field at 1415+52 (1995ApJ...455...75L, 239 sources) 22 for the field at 2215+00 (1995ApJ...455...75L, 199 sources)
History: Copied at * 13-Aug-2002: Added the '*' for galaxies also studied in papers XI and XIV. * 30-May-2008: Added the files "astro.dat" and "photo.dat" from References: Lilly S.J. et al., Paper I =1995ApJ...455...50L Le Fevre O. et al.. Paper II =1995ApJ...455...60L, Cat. J/ApJ/455/60 Lilly et al., Paper III =1995ApJ...455...75L, Cat. J/ApJ/455/75 Hammer F. et al., Paper IV =1995ApJ...455...88H, Cat. J/ApJ/455/88 Crampton D. et al., Paper V =1995ApJ...455...96C Lilly S. J. et al., Paper VI =1995ApJ...455..108L Hammer F. et al., Paper VII =1995MNRAS.276.1085H Le Fevre O. et al., Paper VIII =1996ApJ...461..534L Schade D. et al., Paper IX =1995ApJ...451L...1S Schade D. et al., Paper X =1996MNRAS.278...95S Schade D. et al., Paper XI =1996ApJ...464...79S, Cat. J/ApJ/464/79 Tresse L. et al., Paper XII =1996MNRAS.281..847T Le Fevre et al., Paper XIII =1996BCFHT..34...10L Hammer et al., Paper XIV =1997ApJ...481...49H, Cat. J/ApJ/481/49
(End) Francois Ochsenbein [CDS] 13-Nov-2001
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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