J/AJ/116/584 Cl J0023+0423 and Cl J1604+4304 morphology (Lubin+ 1998)
A study of nine high-redshift clusters of galaxies. III. Hubble space telescope morphology of clusters 0023+0423 and 1604+4304. Lubin L.M., Postman M., Oke J.B., Ratnatunga K.U., Gunn J.E., Hoessel J.G., Schneider D.P. <Astron. J. 116, 584 (1998)> =1998AJ....116..584L (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Morphology ; Photometry, UBVRI ; Redshifts Keywords: cosmology: observations - galaxies: clusters: general - galaxy: evolution Abstract: We present a detailed morphological analysis of the galaxy populations in the first two clusters to be completed in an extensive observational study of nine high-redshift clusters of galaxies. These two clusters, Cl 0023+0423 and Cl 1604+4304, are at redshifts of z=0.84 and z=0.90, respectively. The morphological studies are based on high angular resolution imagery taken with Wide Field Planetary Camera 2 aboard the Hubble Space Telescope. These data are combined with deep, ground-based BVRI photometry and spectra taken with the Keck 10m telescopes. The morphological classifications presented in this paper consist of two parts. First, we provide a quantitative description of the structural properties of ∼600 galaxies per cluster field using the Medium Deep Survey automated data reduction and object classification software. This analysis includes the galaxy position, photometry, and best-fit bulge+disk model. Second, for the brightest subsample of ∼200 galaxies per cluster field, we provide a more detailed morphological description through a visual classification based on the revised Hubble classification scheme. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 00 23 52. +04 23 06 GHO 002118+040630 = Cl J0023+0423 16 04 25.2 +43 04 52 GHO 160244+431254 = Cl J1604+4303 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1a.dat 150 674 Cl J0023+0423 field MDS parameters from the automated galaxy classifications table1b.dat 150 559 Cl J1604+4304 field MDS parameters from the automated galaxy classifications table2a.dat 122 209 Cl J0023+0423 field visually classified galaxies table2b.dat 122 205 Cl J1604+4304 field visually classified galaxies table4a.dat 52 209 Cl J0023+0423 field photometry of the visually classified galaxies table4b.dat 52 205 Cl J1604+4304 field photometry of the visually classified galaxies
See also: J/AJ/116/560 : Cl J0023+0423 and Cl J1604+4304 spectroscopy (Postman+ 1998) J/AJ/122/1125 : BVRI photometry in 3 high-z clusters (Postman+, 2001) http://archive.stsci.edu/mds/mds.cgi : HST Medium Deep Survey WFPC2 catalog Byte-by-byte Description of file: table1a.dat table1b.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [OPL98] *MDS identification number 5 I1 --- Nmod *Model number 7- 10 I4 --- Ntot *Total number of pixels in selected region 12- 15 I4 --- Npix *Total number of pixels in selected region above 1σ 17- 18 I2 --- Nfit *Number of parameters in MLE model 20 I1 --- Chip *WFPC2 CCD number 22- 28 F7.3 pix Xpos *X position of centroid of MLE model 30- 36 F7.3 pix Ypos *Y position of centroid of MLE model 38- 43 F6.3 mag Sky *MLE model Sky magnitude 45- 50 F6.3 mag mtot *Total MLE model magnitude 52- 56 F5.3 mag e_mtot rms uncertainty on mtot 58- 63 F6.3 [arcsec] logR1/2 *Logarithmic half-light radius of MLE model 65- 69 F5.3 [arcsec] e_logR1/2 rms uncertainty on logR1/2 71- 76 F6.3 rad P.A. *[-1.57/1.57] Orientation of MLE model 78- 82 F5.3 rad e_P.A. rms uncertainty on P.A. 84- 88 F5.3 --- b/aD *Disk axis ratio of MLE model 90- 94 F5.3 --- e_b/aD rms uncertainty on e_b/aD 96-100 F5.3 --- b/aB *Bulge axis ratio of MLE model 102-106 F5.3 --- e_b/aB rms uncertainty on e_b/aB 108-112 F5.3 --- B/(B+D) *Bulge-to-(disk+bulge) luminosity ratio 114-118 F5.3 --- e_B/(B+D) rms uncertainty on B/(B+D) 120-125 F6.3 --- log(B/D)R1/2 log ratio of bulge/disk half-light radius of MLE model 127-131 F5.3 --- e_log(B/D)R1/2 rms uncertainty on (B/D)R1/2 133-136 F4.2 --- SNRIL log integrated signal-to-noise ratio 138-143 A6 --- Class *Name of MLE classification 145-150 F6.4 --- Asymm ?=99.99 Asymmetry parameter
Note on [OPL98]: Original identification number from the MDS reduction pipeline. Those numbers that are excluded indicate detected objects that were classified as stars or which did not reach the required signal-to-noise ratio. [OPL98] MDS J0023+0423 NNN in Simbad for table1a.dat [OPL98] MDS J1604+4304 NNN in Simbad for table1b.dat Note on Nmod: MDS model number: 1, disk; 2, bulge; 3, disk+bulge Note on Ntot, Npix: Ntot is the total number of usable pixels in the selected 64 or 128 pixel square region around each object; Npix is the number of Ntot pixels that are more than 1σ above the estimated sky background. Note on Nfit: The number of parameters in the fit that actually vary. A maximum of 12 parameters are fit, though in most cases one or more parameters are held fixed. Note on Chip: CCD chip number: PC=1; WFC=2,3,4 Note on Xpos, Ypos: The mean error between the model centroid and the actual centroid of the object image is 0.2 pixels. Coordinates are relative to each individual chip. Note on Sky: A maximum likelihood estimate for the local sky background is determined simultaneously with the other model parameters. Sufficient pixels are used to ensure that the sky level is determined to an accuracy of 0.5%. The sky background is assumed to be flat over the small region selected for analysis. Note on mtot: Small differences between the analytic total magnitude and the true total magnitude may arise because the true galaxy is not smooth, and the model may not average properly over bright regions of star formation. Note on logR1/2: The radius within which half of the light of the unconvolved model would be contained if it were radially symmetric (an axis ratio of unity). Lower and upper limits of 0.1 pixel and one-half of the maximum radius of the region selected for analysis have been imposed. The half-light radius of the individual components can be derived used the bulge/disk half-radius ratio. Note on P.A.: The adopted position angle (measured east from north) is that of the axis of symmetry of the model. It is set equal to zero when the source is assumed to be azimuthally symmetric with an axis ratio of unity. For disk+bulge models, the orientation is assumed to be the same for both components. Note on b/aD, b/aB: The ratio of the minor axis half-light ratio to that of the major axis. For disk+bulge models it is defined independently for each component. If the axis is not significantly different from unity, it is fixed at 1. A ratio of zero indicates that this component was not fitted to the data. Note on B/(B+D): The luminosity of the individual component can be derived from this parameter and the total magnitude mtot. Note on Class: Object classification: object, galaxy, disk, bulge or disk+bulge.
Byte-by-byte Description of file: table2a.dat table2b.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [OPL98] *MDS object identifier 5- 9 F5.2 mag mtot *Analytic total magnitude 11- 17 A7 --- Class *Hubble class 19 I1 --- D *Disturbance index 21- 26 A6 --- n_D *Interpretation of the disturbance 28-122 A95 --- Comm *Description of object morphology
Note on [OPL98]: [OPL98] MDS J0023+0423 NNN in Simbad for table2a.dat [OPL98] MDS J1604+4304 NNN in Simbad for table2b.dat Note on mtot: Total magnitude of best-fit analytic model in either R702 (Cl 0023+0423) or I814 (Cl 1604+4304) as given in table 1. Note on Class: The standard Hubble classification scheme (e.g. E, S0, Sa, Sab, Sb) with the addition of the following: E/S0 or S0/E, cannot distinguish between E or S0; X, compact object (likely nonstellar, but too compact to see structure); , peculiar or unclassifiable. Note on D: 0, normal; 1, moderate asymmetry; 2, strong asymmetric; 3, moderate distortion; 4, strong distortion. Note on n_D: M, merger; I, tidal interaction with neighbor; T, tidal feature; C, chaotic. Note on Comm: Here, comp. is short for "companion"; @ indicates position relative to the galaxy going clockwise, e.g. @7 = "at 7 o'clock".
Byte-by-byte Description of file: table4a.dat table4b.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [OPL98] *MDS identification number 5- 8 I4 --- Keck *Keck Number 10- 14 F5.2 mag Bmag *B magnitude 16- 20 F5.2 mag Vmag *V magnitude 22- 26 F5.2 mag Rmag *R magnitude 28- 32 F5.2 mag Imag *I magnitude 34- 39 F6.4 --- z ? Redshift 41 A1 --- l_Age limit flag on Age 42- 45 F4.2 Gyr Age *? Galaxy age 47- 50 F4.2 Gyr e_Age ? rms uncertainty on Age
Note on [OPL98]: [OPL98] MDS J0023+0423 NNN in Simbad for table4a.dat [OPL98] MDS J1604+4304 NNN in Simbad for table4b.dat Note on Keck: Corresponding number from the Keck photometry tables (see Paper II, Cat. J/AJ/116/560). Because of the better resolution of the HST observations, an individual galaxy in the Keck image may be associated with more than one galaxy in the corresponding HST image. Therefore, these HST galaxies have the same Keck number. Note on Bmag, Vmag, Rmag, Imag: Keck BVRI aperture photometry. A value of -1.00 indicates no detection in that band Note on Age: Galaxy age determined from a comparison between the τ=0.6Gyr Bruzual & Charlot (1993ApJ...405..538B) population synthesis model and the broadband AB magnitudes derived from the Keck photometry. Upper limits are indicated as values with no errors.
History: From AJ electronic version References: Oke et al., Paper I 1998AJ....116..549O Postman et al., Paper II 1998AJ....116..560P, Cat. J/AJ/116/560 Postman et al., Paper IV 2001AJ....122.1125P, Cat. J/AJ/122/1125
(End) James Marcout, Patricia Bauer [CDS] 09-Nov-1998
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