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 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 2010MNRAS.404.1281P.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 197 250000 *Sample paired spectra for fiducial simulation at z=2
tablea2.dat 197 250000 *Sample paired spectra for H4 simulation at z=2
tablea3.dat 197 250000 *Sample paired spectra for fiducial simulation at z=2.5
tablea4.dat 197 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 196 250000 *Sample paired spectra for fiducial simulation at z=4
tablea8.dat 196 250000 *Sample paired spectra for H4 simulation at z=4
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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.
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Byte-by-byte Description of file: tablea?.dat
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Bytes Format Units Label Explanations
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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)
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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.
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History:
From electronic version of the journal
References:
Peeples et al., Paper I 2010MNRAS.404.1281P 2010MNRAS.404.1281P
(End) Patricia Vannier [CDS] 17-Nov-2010