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J/ApJ/549/172       X-ray-detected, poor groups galaxy populations (Tran+, 2001)
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The galaxy populations of X-ray-detected, poor groups.
    Tran K.-V.H., Simard L., Zabludoff A.I., Mulchaey J.S.
   <Astrophys. J. 549, 172 (2001)>
   =2001ApJ...549..172T
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ADC_Keywords: Clusters, galaxy ; Morphology ; Magnitudes
Keywords: galaxies: clusters: general - galaxies: evolution -
          galaxies: fundamental parameters - galaxies: structure

Abstract:
    We determine the quantitative morphology and star formation properties
    of galaxies in six nearby X-ray-detected, poor groups using multiobject
    spectroscopy and wide-field R imaging. The mean recessional velocities
    of the galaxy groups range from 2843 to 7558km/s. Each group has 1538
    confirmed members ranging in luminosity from dwarfs to giants
    (-13.7>=M_R_-5logh>=-21.9). We measure structural parameters for each
    galaxy by fitting a PSF-convolved, two-component model to their
    surface brightness profiles. To compare the samples directly, we fade,
    smooth, and rebin each galaxy image so that we effectively observe
    each galaxy at the same redshift (9000km/s) and physical resolution
    (0.87h^-1^kpc). The structural parameters are combined with [O II]
    measurements to test for correlations between morphological
    characteristics and current star formation in these galaxies. We
    compare results for the groups to a sample of field galaxies.


File Summary:
--------------------------------------------------------------------------------
 FileName      Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe            80        .   This file
table2.dat        80       18   Structural Parameters of Field Galaxies Measured
                                 at cz_0_ and cz=9000km/s
table3.dat        80      171   Structural Parameters of Group Galaxies Measured
                                 at cz_0_ and cz=9000km/s
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See also:

Table 1: Group Properties
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 Group        RA  (2000.0)  DE    N     HRV     sigma      D
                                       km/s      km/s
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 NGC 2563  20 24 24.    +21 05 46 36 4775+/-65 336+/-44  811
 NGC 3557  11 09 58.5   -37 23 03 15 2843+/-64 282+/-50  488
 NGC 4325  12 23 18.2   +10 37 19 23 7558+/-70 265+/-50 1272
 NGC 5129  13 24 28.1   +13 55 32 34 6998+/-51 304+/-43 1173
 HCG 42    10 00 13.1   -19 38 24 25 3830+/-47 266+/-37  654
 HCG 62    12 53 12.4   -09 12 12 38 4356+/-50 376+/-52  741
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 Notes:
   RA, DE, <v> and sigma are from Zabludoff & Mulchaey,
    1998. Cat. <J/ApJ/496/39>
   N: Total number of group members in the 1{deg}x1{deg} field
    (Zabludoff & Mulchaey, 1998, Cat. <J/ApJ/496/39>).
   D: Physical diameter subtended by 1{deg} at the group's
    mean recessional velocity (H_0_=100hkm/s/Mpc; q_0_=0.5)
--------------------------------------------------------------

Byte-by-byte Description of file: table2.dat table3.dat
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   Bytes Format Units   Label     Explanations
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   1-  5  A5    ---     Field     Field name (1)
   7- 10  I4    ---     Gal       Galaxy number in the field (1)
  12- 15  I4    km/s    cz        Redshift
  17- 19  I3    km/s  e_cz        Uncertainty in cz
  21- 25  F5.1  mag     RMag      Absolute R band magnitude (2)
  27- 30  F4.1  0.1nm   EW        The [O II] (3727{AA}) equivalent width
  32- 35  F4.1  0.1nm e_EW        Uncertainty in EW
  37- 40  F4.2  ---     B/T       Bulge fraction (3)
  42- 45  F4.2  kpc     Rad       Half-light radius (in kpc/h) (4)
  47- 51  F5.2  kpc     RatA      Asymmetry parameter (in kpc/h) (5)
  53- 57  F5.2  ---     RatT      ? Fraction of residual light (6)
  59- 62  F4.2  ---     B/T9      Bulge fraction at cz=9000
  64- 68  F5.2  kpc     Rad9      Half-light radius at cz=9000 (in kpc/h)
  70- 74  F5.2  kpc     RatA9     ? Asymmetry parameter at cz=9000 (in kpc/h)
  76- 80  F5.2  ---     RatT9     ? Fraction of residual light at cz=9000
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Note (1): In Simbad, object are identified as
      [TSZ2001] HCG NN NNN and [TSZ2001] NGC NNNN NNN
Note (2): RMag = M_R_ - 5*log(h) where H_0_ = 100 km/s/Mpc, q_0_ = 0.5, and a
     flat cosmology.
Note (3): Average error for B/T measurement is ~0.1 (Simard et al. 2001, in
      prep.), although B/T can change by as much as 0.59 when the original
     (cz) and degraded (cz=9000km/s) values are compared for the individual
     galaxies.
Note (4): Average error for Rad is ~10% (Simard et al. 2001, in prep.).
Note (5): Average random error for RatA is ~0.02 (Simard et al. 2001, in prep.;
     Im et al. 2001, ApJ, submitted), although RatA can change by as much
     as 0.16 when the original (cz) and degraded (cz=9000km/s) values are
     compared.
Note (6): Average random error for RatT is ~0.02 (Simard et al. 2001, in prep.;
     Im et al. 2001, ApJ, submitted), although RatT can change by as much
     as 0.30 when the original (cz) and degraded (cz=9000km/s) values are
     compared.
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History:
    From electronic version of the journal
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(End)                    Greg Schwarz [AAS], Patricia Bauer [CDS]    28-May-2001