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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
ac118.dat 167 1206 Catalog in the cluster field
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Byte-by-byte Description of file: ac118.dat
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Bytes Format Units Label Explanations
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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)
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Note (1): Magnitudes are corrected for galactic extinction according to
Schlegel et al. (1998ApJ...500..525S 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.
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Acknowledgements: Giovanni Busarello
(End) Giovanni Busarello [INAF, OAC Italy] 15-Jul-2002