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J/AJ/116/584 Cl J0023+0423 and Cl J1604+4304 morphology (Lubin+ 1998)
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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)
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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:
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RA (2000) DE Designation(s)
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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
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File Summary:
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FileName Lrecl Records Explanations
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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 119 205 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
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See also:
J/AJ/116/560 : Cl J0023+0423 and Cl J1604+4304 spectroscopy (Postman+ 1998)
http://archive.stsci.edu/mds/mds.cgi : HST Medium Deep Survey WFPC2 catalog
Byte-by-byte Description of file: table1a.dat, table1b.dat
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Bytes Format Units Label Explanations
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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 1{sigma}
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
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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 1{sigma} 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.
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Byte-by-byte Description of file: table2a.dat, table2b.dat
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Bytes Format Units Label Explanations
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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
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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 R_702_ (Cl 0023+0423)
or I_814_ (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".
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Byte-by-byte Description of file: table4a.dat, table4b.dat
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Bytes Format Units Label Explanations
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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
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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 {tau}=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.
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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>
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(End) James Marcout, Patricia Bauer [CDS] 09-Nov-1998