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J/AJ/127/2484       Early-type galaxies color evolution      (Holden+, 2004)

Evolution in the color-magnitude relation of early-type galaxies in clusters of galaxies at z≃1. Holden B.P., Stanford S.A., Eisenhardt P., Dickinson M. <Astron. J., 127, 2484-2510 (2004)> =2004AJ....127.2484H
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry Keywords: galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: fundamental parameters - galaxies: photometry Abstract: We present a study of the color evolution of elliptical and S0 galaxies in six clusters of galaxies inside the redshift range 0.78<z<1.27. For each cluster, we used imaging from the Hubble Space Telescope (HST) to determine morphological types of the galaxies. These types were determined both by an automated technique and from visual inspection. We performed simulations to determine the accuracy of the automated classifications and found a success rate of ∼75% at m(L*) or brighter magnitudes for most of our HST imaging data with the fraction of late-type galaxies identified as early-type galaxies to be ∼10% at m(L*) to ∼20% at m(L*+2). From ground-based optical and near-infrared imaging, we measured the zero point and scatter in the color-magnitude relation of the elliptical and S0 galaxy populations, which we combine with the sample of Stanford et al. (1998ApJ...492..461S), yielding a sample of cluster early-type galaxies that span a look-back time of almost 9Gyr from the present. Description: We obtained optical and near-IR images of the clusters using CCD and HgCdTe array cameras on NOAO telescopes at Kitt Peak in 1993-1996. Our imaging provides multiwavelength photometric data of uniform quality through a standard set of filters, and we used well-understood photometric systems. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file clusters.dat 36 8 List of the clusters studied here tables.dat 80 476 Imaging Data for 8 clusters (tables 4 to 13 of the paper)
See also: J/ApJS/142/153 : Distant galaxy clusters photometry (Stanford+, 2002) Byte-by-byte Description of file: clusters.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Cluster Cluster designation 17- 18 I2 h RAh Right Ascension J2000 (hours) (1) 20- 21 I2 min RAm Right Ascension J2000 (minutes) (1) 23- 26 F4.1 s RAs Right Ascension J2000 (seconds) (1) 28 A1 --- DE- Declination J2000 (sign) (1) 29- 30 I2 deg DEd Declination J2000 (degrees) (1) 32- 33 I2 arcmin DEm Declination J2000 (minutes) (1) 35- 36 I2 arcsec DEs Declination J2000 (seconds) (1)
Note (1): position from Stanford et al., Cat. J/ApJS/142/153
Byte-by-byte Description of file: tables.dat
Bytes Format Units Label Explanations
1- 14 A14 --- Cluster Cluster designation, as in "clusters.dat" 16- 18 I3 --- [SED2002] Stanford et al. (2002, J/ApJS/142/153) identification number (1) 19 A1 --- f_[SED2002] Indicates two HST objects but a blend in ground-based images 20- 30 A11 ---- Inst Intrument as in the original title of the table (HST, HST NICMOS, HST WFPC2, NICMOS C3) 32- 36 F5.1 arcsec oRA Right ascension offset from central galaxy 38- 42 F5.1 arcsec oDE Declination offset from central galaxy 44- 46 I3 --- MType Morphological class (2) 48- 52 F5.2 --- B/T Bulge-to-total ratio (4) 54- 60 F7.2 --- Res Total galaxy light fraction in the residuals (4) (3) 62- 67 F6.3 arcsec R-h Half-light radius (4) 69- 71 A3 --- HST HST instrument identification (5) 73- 75 I3 pix Xpix X pixel coordinate in HST 77- 79 I3 pix Ypix Y pixel coordinate in HST
Note (1): The galaxies are identified in Simbad as [SED2002] Cluster NNN, i.e. [SED2002] GHO 0229+0035 2 for "GHO 0229+0035 2". Note (2): Morphological types are T-types (de Vaucouleurs et al., 1991, Cat. VII/155), where an early-type galaxy is classified as -5 through -1, with 0 being classified as S0/Sa and not included as an early-type galaxy for this paper. Values smaller than -5 are classified as stars. For 3C 210 and RDCS 0848+4453, classification scheme from Stanford et al. (2002, J/ApJS/142/153) as: 0 = Star 1 = E/S0 2 = Sa/Sb 3 = Sc/Sd 4 = Irr 5 = Merger and/or disturbed Note (3): For some objects, the fraction of galaxy light is strongly negative, such as -199.98. This comes from bright stars where the cores have been removed by the cosmic-ray rejection algorithm. Note (4): For GHO 0021+0406 17 and GHO 0021+0406 88, "MType, B/T, Res" = "-1. -1. -1.", galaxy was too close to the edge of the WFPC2 frame for GIM2D to fit a model, but we could determine visual classifications. Note (5): For 3C 210 (HST NICMOS) and RDCS 0848+4453 (NICMOS C3), NICMOS pointing number
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jul-2004
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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