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J/A+A/389/787     VRI Photometry of Galaxies in AC118 Field   (Busarello+, 2002)

Optical (VRI) Photometry in the Field of the Galaxy Cluster AC118 at z=0.31. Busarello G., Merluzzi P., La Barbera F., Massarotti M., Capaccioli M. <Astron. Astrophys. 389, 787 (2002)> =2002A&A...389..787B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, CCD Keywords: galaxies: clusters: individual: AC118 - galaxies: photometry - galaxies: fundamental parameters (magnitudes, colors) - galaxies: luminosity function Abstract: We present new photometric V-, R- and I-band data for the rich galaxy cluster AC118 at z=0.31. The new photometry covers an area of 8.6x8.6arcmin2, corresponding to 2.9x2.9Mpc2 (H0=50km/s/Mpc, q0=0.5 and Lambda=0). The data have been collected for a project aimed at studying galaxy evolution through the color-magnitude relation and the fundamental plane. We provide a catalogue including all the sources (N=1206) detected in the cluster field. The galaxy sample is complete to V=22.8mag (N_gal=574), R=22.3mag (N_gal=649) and I=20.8mag (N_gal=419). We give aperture magnitudes within a fixed aperture of 4.4arcsec and Kron magnitudes. We also give photometric redshifts for 459 sources for which additional U- and K-band photometry is available. We derive and discuss the V- and R-band luminosity functions. The catalogue is intended as a tool for studies in galaxy evolution. Description: Photometric parameters (VRI aperture and Kron magnitudes, Kron radii and photometric redshifts) for 1206 galaxies in the field of the cluster AC118. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file ac118.dat 167 1206 Catalog in the cluster field
Byte-by-byte Description of file: ac118.dat
Bytes Format Units Label Explanations
2- 5 I4 --- Seq Running number in this catalogue 7- 8 I2 h RAh Right Ascension J2000 (hours) 10- 11 I2 min RAm Right Ascension J2000 (minutes) 13- 18 F6.3 s RAs Right Ascension J2000 (seconds) 21 A1 --- DE- Declination J2000 (sign) 22- 23 I2 deg DEd Declination J2000 (degrees) 25- 26 I2 arcmin DEm Declination J2000 (minutes) 28- 32 F5.2 arcsec DEs Declination J2000 (seconds) 35- 40 F6.3 mag Vmag ?=0.000 V magnitude inside 4.4" aperture (1) 43- 47 F5.3 mag e_Vmag ?=0.000 uncertainty on V magnitude 50- 55 F6.3 mag Rmag ?=0.000 R magnitude inside 4.4" aperture (1) 58- 62 F5.3 mag e_Rmag ?=0.000 uncertainty on R magnitude 65- 70 F6.3 mag Imag ?=0.000 I magnitude inside 4.4" aperture (1) 73- 77 F5.3 mag e_Imag ?=0.000 uncertainty on I magnitude 80- 85 F6.3 mag VKron ?=0.000 Kron V magnitude (1) 88- 92 F5.3 mag e_VKron ?=0.000 uncertainty on Kron V magnitude 95-100 F6.3 mag RKron ?=0.000 Kron R magnitude (1) 103-107 F5.3 mag e_RKron ?=0.000 uncertainty on Kron R magnitude 110-115 F6.3 mag IKron ?=0.000 Kron I magnitude (1) 118-122 F5.3 mag e_IKron ?=0.000 uncertainty on Kron I magnitude 125-129 F5.3 arcsec VKrad ?=0.000 Kron radius in V band (2) 132-136 F5.3 arcsec RKrad ?=0.000 Kron radius in R band (2) 139-143 F5.3 arcsec IKrad ?=0.000 Kron radius in I band (2) 146-149 F4.2 --- S/G ?=0.00 Stellar index, 0 = galaxy, 1 = star (3) 152-155 F4.2 --- zphot ?=0.00 photometric redshift 158-161 F4.2 --- zmin ?=0.00 lower limit of the 68% percentile interval (4) 164-167 F4.2 --- zmax ?=0.00 upper limit of the 68% percentile interval (4)
Note (1): Magnitudes are corrected for galactic extinction according to Schlegel et al. (1998ApJ...500..525S) Note (2): When the Kron radius is smaller than 3.5 pixels, an aperture with this diameter, that corresponds to about 1", is adopted Note (3): We identify as galaxies the objects with stellar index value smaller than 0.9. When available for more than one image, we report the value relative to the image with the best seeing. Note (4): The 68% percentile intervals for photometric redshifts are calculated as explicated in Sect. 4.3 of the paper.
Acknowledgements: Giovanni Busarello
(End) Giovanni Busarello [INAF, OAC Italy] 15-Jul-2002
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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