J/MNRAS/425/477   Dark matter annihilation in galaxy clusters    (Nezri+, 2012)
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{gamma}-rays from annihilating dark matter in galaxy clusters:
stacking versus single source analysis.
    Nezri E., White R., Combet C., Hinton J.A., Maurin D., Pointecouteau E.
   <Mon. Not. R. Astron. Soc., 425, 477-489 (2012)>
   =2012MNRAS.425..477N
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ADC_Keywords: Clusters, galaxy ; Gamma rays ; Models
Keywords: astroparticle physics - dark matter - gamma-rays: galaxies: clusters

Abstract:
    Clusters of galaxies are potentially important targets for indirect
    searches for dark matter (DM) annihilation. Here we reassess the
    detection prospects for annihilation in massive haloes, based on a
    statistical investigation of 1743 clusters in the new Meta-Catalogue
    of X-ray Clusters (MCXC). We derive a new limit for the extragalactic
    DM annihilation background of at least 20 per cent of that
    originating from the Galaxy for an integration angle of 0.1{deg}.

File Summary:
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 FileName   Lrecl  Records   Explanations
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ReadMe         80        .   This file
tablec1.dat    91     1743   J-values for the 1743 MCXC catalogue objects
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See also:
  J/A+A/534/A109 : MCXC Meta-Catalogue X-ray galaxy Clusters (Piffaretti+, 2011)

Byte-by-byte Description of file: tablec1.dat
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   Bytes Format Units       Label     Explanations
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   1- 18  A18   ---         Name      Cluster name (from MCXC)
  20- 23  I4    ---         MCXC      Indice of the cluster row in MCXC catalog,
                                      (recno of Piffaretti et al., 2011,
                                      Cat. J/A+A/534/109 mcxc file)
  25- 30  F6.2  deg         GLON      Galactic longitude in degree (from MCXC)
  32- 37  F6.2  deg         GLAT      Galactic latitude in degree (from MCXC)
  39- 46  E8.3  kpc         d         Distance (from MCXC)
  48- 55  E8.3  deg         alphas    smooth halo dimension {alpha}_s_ (1)
  57- 64  E8.3 Msun+2/kpc+5 Jsm(0.1)  Astrophysical annihilation term (for a
                                      smooth halo) for {alpha}_int_=0.1{deg} (1)
  66- 73  E8.3 Msun+2/kpc+5 Jsub(0.1) Astrophysical annihilation term (for a 
                                      halo with substructures) 
                                      for {alpha}_int_=0.1{deg} (1)
  75- 82  E8.2  deg         alpha.8   Angle {alpha}_.8_ containing 80% of 
                                      the total J
  84- 91  E8.2  ---         J80       Value of annihilation signal for
                                      {alpha}_int_={alpha}_.8_
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Note (1): Parameters listed:
  * the J-factor corresponds to the integral of the squared dark matter
    density {rho} over the line of sight (l) and the solid angle ({Omega)}:
      J={int}{int}{rho}^2^(l,{Omega}).dl.d{Omega}
  * the integration angle {alpha}_int_ is defined with
      {Omega}=2{pi}(1-cos{alpha}_int_) 
  * a smooth dark matter halo is defined with a density profile
       {rho}(r)={rho}_s_.(r/r_s_)^-1^.(1+r/r_s_)^-2^
    where r_s_ is the scale radius of the cluster
  * the smooth halo dimension is defined with {alpha}_s_=atan(r_s_/d) 
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History:
    From electronic version of the journal

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(End)                                      Patricia Vannier [CDS]    27-May-2013