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J/MNRAS/404/1295 Impact of gas pressure on transverse structure (Peeples+, 2010)
Pressure support versus thermal broadening in the Lymanα forest.
II. Effects of the equation of state on transverse structure.
    Peeples M.S., Weinberg D.H., Dave R., Fardal M.A., Katz N.
   <Mon. Not. R. Astron. Soc., 404, 1295-1305 (2010)>
   =2010MNRAS.404.1295P
ADC_Keywords: Interstellar medium ; Models ; Redshifts

Keywords: methods: numerical - intergalactic medium - cosmology: miscellaneous


Abstract:
    We examine the impact of gas pressure on the transverse coherence of
    high-redshift (2≥z≥4) Lymanα (Lyalpha) forest absorption along
    neighbouring lines of sight that probe the gas Jeans scale (projected
    separation Δrp≤500h-1kpc comoving, angular separation
    Δθ≤30arcsec). We compare predictions from two smoothed
    particle hydrodynamics simulations that have different photoionization
    heating rates and thus different temperature-density relations in the
    intergalactic medium (IGM). We also compare spectra computed from the
    gas distributions to those computed from the pressureless dark matter.

Description:
    We use the same 2x2883 particle 12.5h-1Mpc comoving smoothed
    particle hydrodynamics (SPH) simulations that evolved with Gadget-2
    (Springel 2005) as in Paper I, Peeples et al., 2010MNRAS.404.1281P.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
tablea1.dat      198   250000  *Sample paired spectra for fiducial simulation at z=2
tablea2.dat      198   250000  *Sample paired spectra for H4 simulation at z=2
tablea3.dat      198   250000  *Sample paired spectra for fiducial simulation at z=2.5
tablea4.dat      198   250000  *Sample paired spectra for H4 simulation at z=2.5
tablea5.dat      198   250000  *Sample paired spectra for fiducial simulation at z=3
tablea6.dat      198   250000  *Sample paired spectra for H4 simulation at z=3
tablea7.dat      198   250000  *Sample paired spectra for fiducial simulation at z=4
tablea8.dat      198   250000  *Sample paired spectra for H4 simulation at z=4

Note on table*.dat: the "H4" simulation has the same initial conditions as
     the fiducial one, but the heating rate from photoionization by the UV
     background is 4 times higher than in the fiducial simulation.


Byte-by-byte Description of file: tablea?.dat

   Bytes Format Units   Label     Explanations

   1- 11  F11.6 km/s    Vel       Velocity (1)
  13- 28  F16.9 ---     t0        HI optical depth at transverse separation   0kpc (2)
  30- 45  E16.9 ---     t50       HI optical depth at transverse separation  50kpc (2)
  47- 62  E16.9 ---     t100      HI optical depth at transverse separation 100kpc (2)
  64- 79  E16.9 ---     t125      HI optical depth at transverse separation 125kpc (2)
  81- 96  E16.9 ---     t150      HI optical depth at transverse separation 150kpc (2)
  98-113  F16.9 ---     t175      HI optical depth at transverse separation 175kpc (2)
 115-130  F16.9 ---     t200      HI optical depth at transverse separation 200kpc (2)
 132-147  F16.9 ---     t250      HI optical depth at transverse separation 250kpc (2)
 149-164  F16.9 ---     t300      HI optical depth at transverse separation 300kpc (2)
 166-181  F16.9 ---     t400      HI optical depth at transverse separation 400kpc (2)
 183-198  E16.9 ---     t500      HI optical depth at transverse separation 500kpc (2)

Note (1): Each set of 1250 lines corresponds to an independent sightline
     and its pairs, i.e. 200 lines of sight with paired sightlines separated
     by 11 values of Δr between 0 and 500h-1kpc.
Note (2): Transverse separation Δr in h-1kpc comoving.



History:
    From electronic version of the journal

References:
   Peeples et al., Paper I       2010MNRAS.404.1281P
(End)                                      Patricia Vannier [CDS]    17-Nov-2010