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J/ApJ/554/L129    X-ray luminosity-velocity dispersion relation (Mahdavi+, 2001)
The LX-σ relation for galaxies and clusters of galaxies.
    Mahdavi A., Geller M.J.
   <Astrophys. J. 554, L129 (2001)>
   =2001ApJ...554L.129M
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Velocity dispersion

Keywords: galaxies: clusters: general - X-rays: galaxies


Abstract:
    We demonstrate that individual elliptical galaxies and clusters of
    galaxies form a continuous X-ray luminosity-velocity dispersion
    (LX-σ) relation. Our samples of 280 clusters and 57 galaxies
    have LX ∝σ4.4 and LX∝σ10,
    respectively. This unified LX-σ relation spans 8 orders of
    magnitude in LX and is fully consistent with the observed and
    theoretical luminosity-temperature scaling laws. Our results support
    the notion that galaxies and clusters of galaxies are the luminous
    tracers of similar dark matter halos.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
galaxy.dat        90       84   Catalog of galaxies
system.dat        90      280   Catalog of clusters and groups


See also:
   J/ApJS/97/141 : Einstein sample multiparametric analysis. I. (Eskridge+ 1995)
   J/ApJ/518/69  : Deep Optical Catalog of galaxy systems (Mahdavi+, 1999)
   J/ApJ/534/114 : RASSCALS: X-ray and optical study (Mahdavi+, 2000)


Byte-by-byte Description of file: galaxy.dat system.dat

   Bytes Format Units     Label     Explanations

   1- 18  A18   ---       Name      Object name conforming to NED standard
  19- 20  I2    h         RAh       Righ ascension (J2000)
  22- 23  I2    min       RAm       Righ ascension (J2000)
  25- 28  F4.1  s         RAs       Righ ascension (J2000)
      30  A1    ---       DE-       Declination sign (J2000)
  31- 32  I2    deg       DEd       Declination (J2000)
  34- 35  I2    arcmin    DEm       Declination (J2000)
  37- 38  I2    arcsec    DEs       Declination (J2000)
  40- 45  F6.3  ---       z         redshift
  47- 50  F4.2  [km/s]    logsigma  log of velocity dispersion
  52- 55  F4.2  [km/s]  e_logsigma  rms uncertainty on logsigma
  57- 61  F5.2  [solLum]  logLXbol  log of bolometric X-ray luminosity
                                     (H0=50km/s/Mpc)
  63- 66  F4.2  [solLum] e_logLXbol  rms uncertainty on logLXbol
  68- 69  A2    ---     r_logLXbol  [BFHR ] Reference for LXbol and sigma (1)
  71- 90  A20   ---       Com       Other identifications / Comments (2)

Note (1): bolometric X-ray luminosity reference:
    F: X-ray luminosity is from Eskridge, Fabbiano, & Kim
        (1995, Cat. J/ApJS/97/141)
    B: X-ray luminosity is from Beuing et al. (1999MNRAS.302..209B)
    H: X-ray luminosity is from Helsdon & Ponman (2000MNRAS.315..356H)
    R: X-ray luminosity is from Mahdavi et al.
        (2000, Cat. J/ApJ/534/114);
       velocity dispersion is from ongoing survey described in Mahdavi
       et al. (1999, Cat. J/ApJ/518/69).
   HR: Luminosity is from Helsdon & Ponman (2000MNRAS.315..356H);
       velocity dispersion is from Mahdavi et al. (1999, Cat. J/ApJ/518/69)
Note (2): Comments:
    AGN: Galaxy contains an active galactic nucleus (rejected)
     GR: Galaxy X-ray emission is continuous with larger group or
         cluster emission (rejected)


History:
    Copied at http://tdc-www.harvard.edu/lxsigma
(End)                         James Marcout, Patricia Bauer [CDS]    25-Sep-2001