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J/A+A/497/667   WINGS: Deep optical phot. of 77 nearby clusters (Varela+, 2009)

WINGS: A WIde-field Nearby Galaxy-cluster Survey. II. Deep optical photometry of 77 nearby clusters. Varela J., D'Onofrio M., Marmo C., Fasano G., Bettoni D., Cava A., Couch W. J., Dressler A., Kjaergaard P., Moles M., Pignatelli E., Poggianti B. M., Valentinuzzi T. <Astron. Astrophys. 497, 667 (2009)> =2009A&A...497..667V
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry Keywords: galaxies: clusters: general - catalogs Abstract: This is the second paper of a series devoted to the WIde Field Nearby Galaxy-cluster Survey (WINGS). WINGS is a long term project which is gathering wide-field, multi-band imaging and spectroscopy of galaxies in a complete sample of 77 X-ray selected, nearby clusters (0.04<z<0.07) located far from the galactic plane (|b|>200deg). The main goal of this project is to establish a local reference for evolutionary studies of galaxies and galaxy clusters. This paper presents the optical (B,V) photometric catalogs of the WINGS sample and describes the procedures followed to construct them. We have paid special care to correctly treat the large extended galaxies (which includes the brightest cluster galaxies) and the reduction of the influence of the bright halos of very bright stars. We have constructed photometric catalogs based on wide-field images in B and V bands using SExtractor. Photometry has been performed on images in which large galaxies and halos of bright stars were removed after modeling them with elliptical isophotes. We publish deep optical photometric catalogs (90% complete at V21.7, which translates to ∼ MV* + 6 at mean redshift), giving positions, geometrical parameters, and several total and aperture magnitudes for all the objects detected. For each field we have produced three catalogs containing galaxies, stars and objects of "unknown" classification (∼16%). From simulations we found that the uncertainty of our photometry is quite dependent of the light profile of the objects with stars having the most robust photometry and de Vaucouleurs profiles showing higher uncertainties and also an additional bias of ~-0.2m. The star/galaxy classification of the bright objects (V<20) was checked visually making negligible the fraction of misclassified objects. For fainter objects, we found that simulations do not provide reliable estimates of the possible misclassification and therefore we have compared our data with that from deep counts of galaxies and star counts from models of our Galaxy. Both sets turned out to be consistent with our data within ∼5% (in the ratio galaxies/total) up to V∼24. Finally, we remark that the application of our special procedure to remove large halos improves the photometry of the large galaxies in our sample with respect to the use of blind automatic procedures and increases (∼16%) the detection rate of objects projected onto them. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tabled3.dat 52 77 Coordinates of the emission peak of the brightest cluster galaxies (BCG) gal/* 234 77 Datafiles for galaxies in the field of each Cluster (files named Cluster_G.dat) star/* 234 77 Datafiles for stars in the field of each Cluster (files named Cluster_S.dat) unkno/* 234 77 Datafiles for objects of unknown type in each field of the Cluster (files named Cluster_U.dat)
See also: J/A+A/495/707 : WINGS spectroscopy of 48 galaxy clusters (Cava+, 2009) Byte-by-byte Description of file: tabled3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- Cluster Cluster name 9- 10 I2 h RAh Brightest galaxy right ascension (J2000.0) 12- 13 I2 min RAm Brightest galaxy right ascension (J2000.0) 15- 18 F4.1 s RAs Brightest galaxy right ascension (J2000.0) 21 A1 --- DE- Brightest galaxy declination sign (J2000.0) 22- 23 I2 deg DEd Brightest galaxy declination (J2000.0) 25- 26 I2 arcmin DEm Brightest galaxy declination (J2000.0) 28- 31 F4.1 arcsec DEs Brightest galaxy declination (J2000.0) 34- 52 A19 --- SName Simbad name of the cluster
Byte-by-byte Description of file: gal/* star/* unkno/*
Bytes Format Units Label Explanations
1- 5 A5 --- --- [WINGS] 6- 25 A20 --- WINGS Object identification, (1) 27- 35 F9.5 deg RAdeg Right Ascention J2000.0, Barycentre 37- 45 F9.5 deg DEdeg Declination J2000.0, Barycentre 47- 55 F9.5 deg RApdeg Right Ascention J2000.0, Emission peak 57- 65 F9.5 deg DEpdeg Declination J2000.0, Emission peak 67- 74 F8.2 arcsec+2 Area Isophotal area 76- 81 F6.2 arcsec KronRad Kron radius 83- 88 F6.2 arcsec FWHM Full width at half maximum 90- 93 F4.2 -- b/a Ratio between minor axis and major axis 95- 97 I3 deg PA [-90/90] Position angle (North=0, Eastwards) 99-101 I3 -- Flag SExtractor's flags (2) 103-106 F4.2 -- SI [0/1] SExtractor's Stellarity Index (0=galaxy; 1=star) 108-113 F6.3 -- Conc Concentration parameter (3) 115-120 F6.3 -- Contr Contrast parameter (4) 122-126 F5.2 mag/arcsec2 mumax Surface brightness of the emission peak 128-132 F5.2 mag Viso ?=99 SExtractor's MAG_ISO in V band (5) 134-138 F5.2 mag Visoc ?=99 SExtractor's MAG_ISOCOR in V band (5) 140-144 F5.2 mag Vauto ?=99 SExtractor's MAG_AUTO in V band (5) 146-150 F5.2 mag V2kpc ?=99 V magnitude in aperture of r=2kpc (5)(6) 152-156 F5.2 mag V5kpc ?=99 V magnitude in aperture of r=5kpc (5)(6) 158-162 F5.2 mag V10kpc ?=99 V magnitude in aperture of r=10kpc(5)(6) 164-168 F5.2 mag Vfib1 ?=99 V magnitude in aperture of r=1.6" (5) 170-174 F5.2 mag Vfib2 ?=99 V magnitude in aperture of r=2.0" (5) 176-180 F5.2 mag Vfib3 ?=99 V magnitude in aperture of r=2.16"(5) 182-186 F5.2 mag Biso ?=99 SExtractor's MAG_ISO in B band (5) 188-192 F5.2 mag Bisoc ?=99 SExtractor's MAG_ISOCOR in B band (5) 194-198 F5.2 mag Bauto ?=99 SExtractor's MAG_AUTO in B band (5) 200-204 F5.2 mag B2kpc ?=99 B magnitude in aperture of r=2kpc (5)(6) 206-210 F5.2 mag B5kpc ?=99 B magnitude in aperture of r=5kpc (5)(6) 212-216 F5.2 mag B10kpc ?=99 B magnitude in aperture of r=10kpc(5)(6) 218-222 F5.2 mag Bfib1 ?=99 B magnitude in aperture of r=1.6" (5) 224-228 F5.2 mag Bfib2 ?=99 B magnitude in aperture of r=2.0" (5) 230-234 F5.2 mag Bfib3 ?=99 B magnitude in aperture of r=2.16"(5)
Note (1): The object identification contains the coordinates of the most probable centre. For objects brighter than V=17 the peak of emission has been chosen while for fainter objects the barycentre position was chosen. Note (2): SExtractor's flags meaning from SExtractor User's Manual 2.4. FLAGS contains, coded in decimal, all the extraction flags as a sum of powers of 2: 1 = The object has neighbours, bright and close enough to significantly bias the MAG AUTO photometry, or bad pixels (more than 10% of the integrated area affected), 2 = The object was originally blended with another one, 4 = At least one pixel of the ob ject is saturated (or very close to), 8 = The object is truncated (too close to an image boundary), 16 = Object's aperture data are incomplete or corrupted, 32 = Object's isophotal data are incomplete or corrupted, 64 = A memory overflow occurred during deblending, 128 = A memory overflow occurred during extraction. For example, an object close to an image border may have FLAGS=16, and perhaps FLAGS=8+16+32 = 56. Note (3): The concentration given is the ratio between the flux of the 9% central pixels and the total flux, Note (4): The contrast given is the ratio between the flux of the 30% brightest pixels and the total flux. Note (5): Magnitudes are not corrected by galactic extinction. Note (6): The radius in kpc are computed at the distance of the target cluster.
Acknowledgements: Jesus Varela, jesus.varela.lopez(at) References: Fasano et al., Paper I. 2006A&A...445..805F Varela et al., Paper II. 2009A&A...497..667V Valentnuzzi et al., Paper III. 2009arXiv0902.0954V Cava el al., Spectroscopy 2009A&A...495..707C
(End) Patricia Vannier [CDS] 14-May-2009
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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