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J/AJ/116/560        Cl J0023+0423 and Cl J1604+4304 spectroscopy (Postman+ 1998)
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)
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 ∼3x1014M☉ and a less massive group with
    ∼1013M☉. Cl 1604+4304 is a centrally concentrated, rich
    cluster at z=0.8967 with a velocity dispersion of 1226km/s and a mass
    of ∼3x1015M☉.
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
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


See also:
   J/AJ/116/584  : Cl J0023+0423 and Cl J1604+4304 morphology (Lubin+ 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: table2.dat table3.dat

   Bytes Format Units   Label     Explanations

   1-  4  I4    ---     [OPL98]   Star designation (1)
   6- 10  F5.2  mag     Bmag      ? ABB magnitude
  12- 16  F5.2  mag     Vmag      ? ABV magnitude
  18- 22  F5.2  mag     Rmag      ? ABR magnitude
  24- 28  F5.2  mag     Imag      ? ABI 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] λ3727 equivalent width (3)
  56- 61  F6.1  0.1nm   EWHbeta   ? Hβ equivalent width
  63- 68  F6.1  0.1nm   EW[OIII]  ? [O III] λ5007  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)   ? 4000Å break (5)
  86- 91  F6.2  mag     BMAG      ? Absolute ABB magnitude

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 3400Å and
           4280Å. Two continuum bands, one from 3400-3700Å and the other
           from 4050-4280Å, are defined. The flux in each band is fitted and
           the ratio of two fits evaluated at 3850Å defines the jump
Note (5): Ratio of the integrated flux per unit wavelength in the rest band
           4050-4250Å to that in the rest band 3750-3950Å
           (Bruzual, 1983ApJ...273..105B).


Table 5: Spectrum features bands
-------------------------------------------------------
 Continuum band  Line band  Identification
-------------------------------------------------------
    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, Hε
    3985-4011
    4065-4085
                 4089-4111  H{delta
    4115-4135
    4239-4281
                 4280-4320  G band
                 4329-4351  Hγ
    4355-4375
    4789-4829
                 4839-4879  Hβ
    4899-4939
                 4987-5027  [O III] 5007
    5029-5069

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
   Postman et al., Paper IV   2001AJ....122.1125P, Cat. J/AJ/122/1125
(End)                           James Marcout, Patricia Bauer [CDS]  09-Nov-1998