Access to Astronomical Catalogues

← Click to display the menu
J/A+A/444/365       ESO Distant Cluster Survey, EDisCS            (White+, 2005)

EDisCS - the ESO Distant Cluster Survey. Sample Definition and Optical Photometry. White S.D.M., Clowe D.I., Simard L., Rudnick G., De Lucia G., Aragon-Salamanca A., Bender R., Best P., Bremer M., Charlot S., Dalcanton J., Dantel M., Desai V., Fort B., Halliday C., Jablonka P., Kauffmann G., Mellier Y., Milvang-Jense B., Pello R., Poggianti B., Poirier S., Rottgering H., Saglia R., Schneider P., Zaritsky D. <Astron. Astrophys. 444, 365 (2005)> =2005A&A...444..365W
ADC_Keywords: Clusters, galaxy ; Galaxies, optical ; Galaxies, photometry ; Galaxy catalogs Keywords: galaxies: clusters: general ; galaxies: evolution - Abstract: We present the ESO Distant Cluster Survey (EDisCS) a survey of 20 distant galaxy clusters with redshifts ranging from 0.4 to 0.8. Candidate clusters were chosen from among the brightest objects identified in the Las Campanas Distant Cluster Survey (LCDCS), half with estimated redshift zest∼0.5 and half with zest∼0.8. They were confirmed by identifying red sequences in moderately deep two colour data from VLT/FORS2. For confirmed candidates we have assembled deep three-band optical photometry using VLT/FORS2, deep near-infrared photometry in one or two bands using NTT/SOFI, deep optical spectroscopy using VLT/FORS2, wide field imaging in two or three bands using the ESO Wide Field Imager, and HST/ACS mosaic images for 10 of the most distant clusters. This first paper presents our sample and the VLT photometry we have obtained. We present images, colour magnitude diagrams and richness estimates for our clusters, as well as giving redshifts and positions for the brightest cluster members. Subsequent papers will present our infrared photometry, spectroscopy, HST and wide-field imaging, as well as a wealth of further analysis and science results. Our reduced data become publicly available as these papers are accepted. Description: Optical photometric parameters for galaxies in the twenty EDisCS cluster fields measured from our deep VLT/FORS2 imaging. Mid-z clusters were observed in BVI and high-z clusters were observed in VRI. The catalogs contain six types of magnitude (r=1",2",3" aperture magnitudes as well as isophotal, and total (MAG_AUTO and MAG_AUTO+correction). The catalogs also include SExtractor "stellarity" indices, half-light radii, ellipticities and position angles. SExtractor version 2.2.2 was used for the EDisCS photometry. The magnitude limits used for this catalog are mtotalI ≤ 24.0 for mid-z clusters and mtotalI ≤ 24.5 for high-z clusters. Zeropoint errors computed from rms dispersions in standard star measurements are 0.018 in B, 0.013 in V, 0.013 in R and 0.016 in I. These zeropoint errors are NOT included in the errors presented in this catalog, and they should therefore be added in quadrature to errors in catalog to obtain the full photometric errors. The FORS2 filters B, V and I are close approximations to the Bessel (1990PASP..102.1181B) photometric system while R filter is a special filter for FORS2 (see http://www.eso.org/instruments/fors/inst/Filters/curves.html ). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 498 40957 *Optical photometric parameters for galaxies on EDisCS VLT/FORS2 images
Note on catalog.dat: "***" fields mean that data were not acquired for these fields.
See also: J/ApJS/137/117 : Las Campanas Distant Cluster Survey (LCDCS) (Gonzales+, 2001) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [EDCSN] 6- 21 A16 --- EDCSN EDisCS Object ID (JHHMMSSs+DDMMSSs) 23- 32 F10.6 h RAhour Object Right Ascension (J2000) 34- 43 F10.6 deg DEdeg Object Declination (J2000) 45- 51 F7.3 mag Bmagr1 ?=* FORS2 B magnitude in r=1" aperture 53- 59 F7.3 mag e_Bmagr1 ?=* B magnitude error from empty aperture simulations in r=1" aperture (1) 61- 67 F7.3 mag Vmagr1 ?=* FORS2 V magnitude in r=1" aperture 69- 75 F7.3 mag e_Vmagr1 ?=* V magnitude error from empty aperture simulations in r=1" aperture (1) 77- 83 F7.3 mag Rmagr1 ?=* FORS2 R magnitude in r=1" aperture 85- 91 F7.3 mag e_Rmagr1 ?=* R magnitude error from empty aperture simulations in r=1" aperture (1) 93- 99 F7.3 mag Imagr1 ?=* FORS2 I magnitude in r=1" aperture 101-107 F7.3 mag e_Imagr1 ?=* I magnitude error from empty aperture simulations in r=1" aperture 109-115 F7.3 mag Bmagr2 ?=* FORS2 B magnitude in r=2" aperture 117-123 F7.3 mag e_Bmagr2 ?=* B magnitude error from empty aperture simulations in r=2" aperture (1) 125-131 F7.3 mag Vmagr2 ?=* FORS2 V magnitude in r=2" aperture 133-139 F7.3 mag e_Vmagr2 ?=* V magnitude error from empty aperture simulations in r=2" aperture (1) 141-147 F7.3 mag Rmagr2 ?=* FORS2 R magnitude in r=2" aperture 149-155 F7.3 mag e_Rmagr2 ?=* R magnitude error from empty aperture simulations in r=2" aperture (1) 157-163 F7.3 mag Imagr2 ?=* FORS2 I magnitude in r=2" aperture 165-171 F7.3 mag e_Imagr2 ?=* I magnitude error from empty aperture simulations in r=2" aperture (1) 173-179 F7.3 mag Bmagr3 ?=* FORS2 B magnitude in r=3" aperture (1) 181-187 F7.3 mag e_Bmagr3 ?=* B magnitude error from empty aperture simulations in r=3" aperture (1) 189-195 F7.3 mag Vmagr3 ?=* FORS2 V magnitude in r=3" aperture 197-203 F7.3 mag e_Vmagr3 ?=* V magnitude error from empty aperture simulations in r=3" aperture (1) 205-211 F7.3 mag Rmagr3 ?=* FORS2 R magnitude in r=3" aperture 213-219 F7.3 mag e_Rmagr3 ?=* R magnitude error from empty aperture simulations in r=3" aperture (1) 221-227 F7.3 mag Imagr3 ?=* FORS2 I magnitude in r=3" aperture 229-235 F7.3 mag e_Imagr3 ?=* I magnitude error from empty aperture simulations in r=3" aperture (1) 237-243 F7.3 mag Bmagiso ?=* FORS2 B isophotal magnitude 245-251 F7.3 mag e_Bmagiso ?=* B isophotal magnitude error from empty aperture simulations (1) 253-259 F7.3 mag Vmagiso ?=* FORS2 V isophotal magnitude 261-267 F7.3 mag e_Vmagiso ?=* V isophotal magnitude error from empty aperture simulations (1) 269-275 F7.3 mag Rmagiso ?=* R isophotal magnitude 277-283 F7.3 mag e_Rmagiso ?=* R isophotal magnitude error from empty aperture simulations (1) 285-291 F7.3 mag Imagiso ?=* FORS2 I isophotal magnitude 293-299 F7.3 mag e_Imagiso ?=* I isophotal magnitude error from empty aperture simulations 301-307 F7.3 mag Bmagauto ?=* FORS2 B auto magnitude 309-315 F7.3 mag e_Bmagauto ?=* B auto magnitude error from empty aperture simulations (1) 317-323 F7.3 mag Vmagauto ?=99.000 FORS2 V auto magnitude 325-331 F7.3 mag e_Vmagauto ?=* V auto magnitude error from empty aperture simulations (1) 333-339 F7.3 mag Rmagauto ?=* R auto magnitude 341-347 F7.3 mag e_Rmagauto ?=* R auto magnitude error from empty aperture simulations (1) 349-355 F7.3 mag Imagauto ?=* FORS2 I auto magnitude 357-363 F7.3 mag e_Imagauto ?=* I auto magnitude error from empty aperture simulations 365-371 F7.3 mag Iapcorrr Point source aperture corrections (2) 373-379 F7.3 mag Imagtot ?=* FORS2 I total magnitude (3) 381-387 F7.3 mag e_Imagtot ?=* I total magnitude error from empty aperture simulations 389-392 I4 --- Bflg ?=* B SExtractor object flag 394-397 I4 --- Vflg V SExtractor object flag 399-402 I4 --- Rflg ?=* R SExtractor object flag 404-407 I4 --- Iflg I SExtractor object flag 409-412 F4.2 --- Bst ?=* B SExtractor "Stellarity" index (1=star) 414-417 F4.2 --- Vst V SExtractor "Stellarity" index (1=star) 419-422 F4.2 --- Rst ?=* R SExtractor "Stellarity" index (1=star) 424-427 F4.2 --- Ist I SExtractor "Stellarity" index (1=star) 429-434 F6.2 arcsec Bhlr ?=* Object B SExtractor half-light radius (4) (1) 436-441 F6.2 arcsec Vhlr Object V SExtractor half-light radius (4) (1) 443-448 F6.2 arcsec Rhlr ?=* Object R SExtractor half-light radius (4) (1) 450-455 F6.2 arcsec Ihlr Object I SExtractor half-light radius (4) 457-460 F4.2 --- Iell I SExtractor object ellipticity (0=circular) 462-468 F7.2 deg Ipa I SExtractor object position angle (CCW from image x-axis) 470-475 F6.2 arcsec Ia I SExtractor object semi-major axis 477-482 F6.2 arcsec Ib I SExtractor object semi-minor axis 484-489 F6.2 arcsec Irkron I SExtractor object Kron radius 491-497 F7.2 arcsec2 IisoA I SExtractor object isophotal area (5)
Note (1): When the magnitude for an object given by SExtractor in a given band was fainter than the 1-sigma magnitude limit measured from the empty aperture simulations, this magnitude was replaced by the 1-sigma limit and the corresponding magnitude error was set to 99.000. All magnitudes with 99.000 error values are therefore 1-sigma limits. Note that if e_?magauto is 99.000, then the value given by SExtractor for the object half-light radius cannot be trusted. Therefore, the half-light radius was also set to 99.000 for these cases. Note (2): Used to convert auto magnitudes to the "total" magnitudes. These were derived on an image-by-image basis using the curves of growth of unsaturated and uncrowd ed stars. Note (3): Imagtot = Imagauto + Iapcorr Note (4): SExtractor "FLUX_RADIUS" parameter. Note (5): Minimum possible value was set to 0".70 (3.5 pixels) in SExtractor parameter configuration.
Acknowledgements: Luc Simard,
(End) Luc Simard [NRC-HIA], Patricia Vannier [CDS] 23-Aug-2005
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

catalogue service

© UDS/CNRS

Contact