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J/MNRAS/370/1223 Dynamical properties of 15 nearby galaxy groups (Brough+, 2006)
Southern GEMS groups. I. Dynamical properties.
    Brough S., Forbes D.A., Kilborn V.A., Couch W.
   <Mon. Not. R. Astron. Soc. 370, 1223 (2006)>
   =2006MNRAS.370.1223B
ADC_Keywords: Clusters, galaxy ; Galaxies, nearby ; Radial velocities ;
              Velocity dispersion
Keywords: surveys - galaxies: evolution - galaxies: formation -
          galaxies: fundamental parameters

Abstract:
    Here, we present an investigation of the properties of 15 nearby
    galaxy groups and their constituent galaxies. The groups are selected
    from the Group Evolution Multiwavelength Study (GEMS) and all have
    X-ray as well as wide-field neutral hydrogen (HI) observations. Group
    membership is determined using a friends-of-friends algorithm on the
    positions and velocities from the 6-degree Field Galaxy Survey and
    NASA/IPAC Extragalactic Database. For each group we derive their
    physical properties using this membership, including: velocity
    dispersions (sigmav), virial masses (MV), total K-band
    luminosities [LK(Tot)] and early-type fractions (fearly) and
    present these data for the individual groups.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       123       15   Dynamical parameters of groups derived using
                              FOF (friends-of-friends) membership and distances
tablea1.dat      107      249   Details of the galaxies in each group


See also:
       VII/86  : Groups of Galaxies. I. Nearby Groups (Huchra+ 1982)
       VII/145 : Nearby Galaxies Catalogue (NBG) (Tully 1988)
       VII/161 : Nearby Galaxies (Schmidt+ 1993)
 J/A+AS/139/97 : HI properties of nearby galaxies (Karachentsev+, 1999)
 J/ApJ/543/178 : Nearby Optical Galaxy (NOG) sample (Giuricin+, 2000)


Byte-by-byte Description of file: table3.dat

   Bytes Format Units         Label     Explanations

   1-  8  A8    ---           Group     Group name
  10- 11  I2    ---           Nm        Number of members in each group as
                                         defined by the FOF algorithm
  13- 14  I2    ---           NmK       Number of members with MK<=20 (1)
  16- 17  I2    h             RAh       Right ascension (J2000)
  19- 20  I2    min           RAm       Right ascension (J2000)
  22- 26  F5.2  s             RAs       Right ascension (J2000)
      28  A1    ---           DE-       Declination sign (J2000)
  29- 30  I2    deg           DEd       Declination (J2000)
  32- 33  I2    arcmin        DEm       Declination (J2000)
  35- 39  F5.2  arcsec        DEs       Declination (J2000)
  41- 44  I4    km/s          <vel>     Mean group velocity
  46- 47  I2    km/s          e_<vel>   sigma/sqrt(N) error on <vel>
  49- 51  I3    km/s          sigma     Velocity dispersion
  53- 54  I2    km/s          e_sigma   1sigma error on sigma
  56- 59  F4.2  Mpc           r500      r500 radius, calculated from the
                                         velocity dispersion
  61- 64  F4.2  Mpc           e_r500    1sigma error on r500
  66- 68  F3.1  10+13solMass  Mvir      Virial mass
  70- 72  F3.1  10+13solMass  e_Mvir    1sigma error on Mvir
  74- 77  F4.2  ---           tc        Crossing time (in units of 1/H0)
  79- 83  F5.3  ---           e_tc      1sigma error on tc
  85- 88  F4.2  10+11solLum   LK        Total K-band luminosity
  90- 93  F4.2  10+11solLum   e_LK      1sigma error on LK
  95- 97  I3    Sun           MV/LK     Mass-to-light ratio
  99-100  I2    Sun           e_MV/LK   1sigma error on MV/LK
 102-105  F4.2  ---           f(early)  Early-type galaxies fraction
 107-110  F4.2  ---         e_f(early)  Poissonian error on f(early)
 112-115  F4.2  Mpc           Extent    Maximum projected radial extent
 117-120  F4.1  Mpc           Dist      Distance used for the dynamical
                                         parameter determination
 122-123  A2    ---           r_Dist    Reference for Dist (2)

Note (1): The magnitude limit of 2MASS at the distance of our furthest group,
          NGC 3557.
Note (2): Distances from Tonry et al., 2001ApJ...546..681T, corrected following:
     TJ = Jensen et al., 2003ApJ...583..712J
      O = Osmond & Ponman, 2004MNRAS.350.1511O
      F = Forbes et al., 2006, Cat. J/MNRAS/366/1230


Byte-by-byte Description of file: tablea1.dat

   Bytes Format Units   Label     Explanations

   1-  8  A8    ---     Group     Group designation
  10- 34  A25   ---     Name      Galaxy name (1)
  36- 38  A3    ---     ---       [6dF]
  40- 54  A15   ---     6dF       6dF designation (JHHMMSSs-DDMMSS)
  56- 57  I2    h       RAh       Right ascension (J2000)
  59- 60  I2    min     RAm       Right ascension (J2000)
  62- 66  F5.2  s       RAs       Right ascension (J2000)
      68  A1    ---     DE-       Declination sign (J2000)
  69- 70  I2    deg     DEd       Declination (J2000)
  72- 73  I2    arcmin  DEm       Declination (J2000)
  75- 79  F5.2  arcsec  DEs       Declination (J2000)
  81- 84  I4    km/s    <vel>     Mean velocity
  86- 90  F5.2  mag     Kmag      K magnitude
  92- 96  F5.3  mag     e_Kmag    rms uncertainty on Kmag
  98-102  F5.3  Mpc     Rgc       Group-centric radius from the centre
                                   calculated by the FOF algorithm
 104-107  F4.1  ---     TType     ?=99.9 Morphological T-type

Note (1): New galaxies found in HI are named GEMS-groupname-number.



History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    13-Nov-2006