2009A&A...508.1173P


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET03:11:16

2009A&A...508.1173P - Astronomy and Astrophysics, volume 508, 1173-1191 (2009/12-4)

Photometric redshifts and cluster tomography in the ESO distant cluster survey.

PELLO R., RUDNICK G., DE LUCIA G., SIMARD L., CLOWE D.I., JABLONKA P., MILVANG-JENSEN B., SAGLIA R.P., WHITE S.D.M., ARAGON-SALAMANCA A., HALLIDAY C., POGGIANTI B., BEST P., DALCANTON J., DANTEL-FORT M., FORT B., VON DER LINDEN A., MELLIER Y., ROTTGERING H. and ZARITSKY D.

Abstract (from CDS):

This paper reports the results obtained on the photometric redshifts measurement and accuracy, and cluster tomography in the ESO Distant Cluster Survey (EDisCS) fields. We present the methods used to determine photometric redshifts to discriminate between member and non-member galaxies and reduce the contamination by faint stars in subsequent spectroscopic studies. Photometric redshifts were computed using two independent codes both based on standard spectral energy distribution (SED) fitting methods (Hyperz and Rudnick's code). Simulations were used to determine the redshift regions for which a reliable determination of photometric redshifts was expected. The accuracy of the photometric redshifts was assessed by comparing our estimates with the spectroscopic redshifts of ∼1400 galaxies in the 0.3≤z≤1.0 domain. The accuracy expected for galaxies fainter than the spectroscopic control sample was estimated using a degraded version of the photometric catalog for the spectroscopic sample. The accuracy of photometric redshifts is typically σ(Δ z/(1+z))∼0.05±0.01, depending on the field, the filter set, and the spectral type of the galaxies. The quality of the photometric redshifts degrades by a factor of two in σ(Δz/(1+z)) between the brightest (I≲22) and the faintest (I∼24-24.5) galaxies in the EDisCS sample. The photometric determination of cluster redshifts in the EDisCS fields using a simple algorithm based on zphot is in excellent agreement with the spectroscopic values, such that δz∼0.03-0.04 in the high-z sample and δz∼0.05 in the low-z sample, i.e. the zphot cluster redshifts are at least a factor ~(1+z) more accurate than the measurements of zphot for individual galaxies. We also developed a method that uses both photometric redshift codes jointly to reject interlopers at magnitudes fainter than the spectroscopic limit. When applied to the spectroscopic sample, this method rejects ∼50-90% of all spectroscopically confirmed non-members, while retaining >90% of all confirmed members. Photometric redshifts are found to be particularly useful for the identification and study of clusters of galaxies in large surveys. They enable efficient and complete pre-selection of cluster members for spectroscopy, allow accurate determinations of the cluster redshifts based on photometry alone, and provide a means of determining cluster membership, especially for bright sources.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: distances and redshifts - galaxies: photometry - galaxies: evolution

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 ClG J1018-1211 ClG 10 18 46.45 -12 11 52.8     20.35     ~ 30 0
2 ClG J1037-1243 ClG 10 37 52.6 -12 43 44           ~ 39 0
3 ClG J1040-1155 ClG 10 40 41.6 -11 55 51           ~ 55 0
4 ClG J1054-1146 ClG 10 54 24.2 -11 46 18           ~ 50 0
5 ClG J1054-1245 ClG 10 54 43.5 -12 45 50           ~ 54 0
6 ClG J1059-1253 ClG 10 59 09.5 -12 53 15           ~ 27 0
7 ClG J1103-1244 ClG 11 03 36.5 -12 44 22           ~ 18 0
8 ClG J1103-1245 ClG 11 03 42.9 -12 45 18           ~ 16 1
9 ClG J1119-1129 ClG 11 19 16.5 -11 29 33           ~ 20 0
10 ClG J1122-1136 ClG 11 22 51.7 -11 36 30           ~ 12 0
11 ClG J1138-1133 ClG 11 38 10.3 -11 33 59           ~ 44 0
12 ClG J1202-1224 ClG 12 02 43.1 -12 24 31           ~ 26 0
13 ClG J1216-1201 ClG 12 16 45.10 -12 01 17.3           ~ 66 0
14 ClG J1227-1138 ClG 12 27 53.9 -11 38 20           ~ 45 0
15 ClG J1232-1250 ClG 12 32 30.5 -12 50 33           ~ 48 0
16 ClG J1238-1144 ClG 12 38 33.5 -11 44 28           ~ 14 0
17 ClG J1301-1139 ClG 13 01.7 -11 39           ~ 12 0
18 ClG J1353-1137 ClG 13 53 01.0 -11 37 31           ~ 27 0
19 ClG J1354-1230 ClG 13 54 09.5 -12 30 59           ~ 45 0
20 ClG J1411-1148 ClG 14 11 03.9 -11 48 22           ~ 27 0
21 ClG J1420-1236 ClG 14 20 19.4 -12 36 36           ~ 25 0

    Equat.    Gal    SGal    Ecl

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