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J/AJ/116/560 Cl J0023+0423 and Cl J1604+4304 spectroscopy (Postman+ 1998)
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A study of nine high-redshift clusters of galaxies.
II. Photometry, spectra, and ages of clusters 0023+0423 and 1604+4304.
Postman M., Lubin L.M., Oke J.B.
<Astron. J. 116, 560 (1998)>
=1998AJ....116..560P (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, galaxy ; Photometry, UBVRI ; Spectroscopy ; Redshifts
Keywords: galaxies: clusters: individual: Cl 0023+0423, Cl 1604+4304
Abstract:
We present an extensive photometric and spectroscopic study of two
high-redshift clusters of galaxies based on data obtained from the
Keck 10m telescopes and the Hubble Space Telescope. The clusters Cl
0023+0423 (z=0.84) and Cl 1604+4304 (z=0.90) are part of a
multiwavelength program of Oke, Postman & Lubin (1998AJ....116..549O,
Paper I) to study nine candidate clusters at z>~0.6. Based on these
observations, we study in detail both the field and cluster
populations. From the confirmed cluster members, we find that
Cl 0023+0423 actually consists of two components separated by
~2900km/s. A kinematic analysis indicates that the two components are
a poor cluster with ~3x10^14^M_{sun}_ and a less massive group with
~10^13^M_{sun}_. Cl 1604+4304 is a centrally concentrated, rich
cluster at z=0.8967 with a velocity dispersion of 1226km/s and a mass
of ~3x10^15^M_{sun}_.
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
table2.dat 91 127 Objects with spectra in the Cl J0023+0423 field
table3.dat 91 127 Objects with spectra in the Cl J1604+4303 field
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See also:
J/AJ/116/584 : Cl J0023+0423 and Cl J1604+4304 morphology (Lubin+ 1998)
http://archive.stsci.edu/mds/mds.cgi : HST Medium Deep Survey WFPC2 catalog
Byte-by-byte Description of file: table2.dat, table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [OPL98] Star designation (1)
6- 10 F5.2 mag Bmag ? AB_B_ magnitude
12- 16 F5.2 mag Vmag ? AB_V_ magnitude
18- 22 F5.2 mag Rmag ? AB_R_ magnitude
24- 28 F5.2 mag Imag ? AB_I_ magnitude
30- 35 F6.4 --- z ?=9.0000 Redshift
37 I1 --- q_z ? [1/4] Quality on z (2)
39- 40 A2 --- l_Age [>=] Limit flag on Age
41- 43 F3.1 Gyr Age ? Color age
45- 47 F3.1 Gyr e_Age ? rms uncertainty on Age
49- 54 F6.1 0.1nm EW[OII] ? [O II] {lambda}3727 equivalent width (3)
56- 61 F6.1 0.1nm EWHbeta ? H{beta} equivalent width
63- 68 F6.1 0.1nm EW[OIII] ? [O III] {lambda}5007 equivalent width (3)
70- 74 F5.2 --- Jump ? Balmer jump index (4)
76- 79 I4 0.1nm lambdaJ ? Transition wavelength
81- 84 F4.2 --- D(4000) ? 4000{AA} break (5)
86- 91 F6.2 mag BMAG ? Absolute AB_B_ magnitude
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Note (1): table2.dat: [OPL98] Keck J0023+0423 NNNN in Simbad database
table3.dat: [OPL98] Keck J1604+4304 NNNN in Simbad database
Note (2): 1: redshift possible
2: redshift probably correct
3: redshift almost certainly correct
4: redshift is certain
Note (3): The equivalent widths are positive if the line is in absorption,
and negative if the line is in emission.
Note (4): The break amplitude is based on the flux between 3400{AA} and
4280{AA}. Two continuum bands, one from 3400-3700{AA} and the other
from 4050-4280{AA}, are defined. The flux in each band is fitted and
the ratio of two fits evaluated at 3850{AA} defines the jump
Note (5): Ratio of the integrated flux per unit wavelength in the rest band
4050-4250{AA} to that in the rest band 3750-3950{AA}
(Bruzual, 1983ApJ...273..105B).
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Table 5: Spectrum features bands
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Continuum band Line band Identification
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3699-3711
3712-3742 [O II]
3749-3761
3799-3821
3819-3845 CN, H9, etc.
3849-3871
3879-3899 H8
3899-3921
3923-3943 Ca II K
3959-3981 Ca II H, H{epsilon}
3985-4011
4065-4085
4089-4111 H{delta
4115-4135
4239-4281
4280-4320 G band
4329-4351 H{gamma}
4355-4375
4789-4829
4839-4879 H{beta}
4899-4939
4987-5027 [O III] 5007
5029-5069
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History: From AJ electronic version
References:
Oke et al., Paper I 1998AJ....116..549O
Lubin et al., Paper III 1998AJ....116..584L, Cat. <J/AJ/116/584>
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(End) James Marcout, Patricia Bauer [CDS] 09-Nov-1998