J/ApJ/729/82 Integrated column densities vs shock age (Gnat, 2011)
Partially cooled shocks: detectable precursors in the warm/hot intergalactic
medium.
Gnat O.
<Astrophys. J., 729, 82 (2011)>
=2011ApJ...729...82G 2011ApJ...729...82G
ADC_Keywords: Atomic physics ; Abundances ; Interstellar medium
Keywords: atomic processes - intergalactic medium - ISM: general - plasmas -
quasars: absorption lines - shock waves
Abstract:
I present computations of the integrated column densities produced in
the post-shock cooling layers and in the radiative precursors of
partially cooled fast shocks as a function of the shock age. The
results are applicable to the shock-heated warm/hot intergalactic
medium which is expected to be a major baryonic reservoir and contain
a large fraction of the so-called missing baryons. My computations
indicate that readily observable amounts of intermediate and high
ions, such as CIV, NV, and OVI, are created in the precursors of young
shocks, for which the shocked gas remains hot and difficult to
observe. I suggest that such precursors may provide a way to identify
and estimate the "missing" baryonic mass associated with the shocks.
The absorption-line signatures predicted here may be used to construct
ion-ratio diagrams, which will serve as diagnostics for the
photoionized gas in the precursors. In my numerical models, the time
evolution of the shock structure, self-radiation, and associated
metal-ion column densities are computed by a series of quasi-static
models, each appropriate for a different shock age. The shock code
used in this work calculates the non-equilibrium ionization and
cooling, follows the radiative transfer of the shock self-radiation
through the post-shock cooling layers, takes into account the
resulting photoionization and heating rates, follows the dynamics of
the cooling gas, and self-consistently computes the photoionization
states in the precursor gas. I present a complete set of the
age-dependent post-shock and precursor columns for all ionization
states of the elements H, He, C, N, O, Ne, Mg, Si, S, and Fe as
functions of the shock velocity, gas metallicity, and magnetic field.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sets.dat 47 20 Set of the age-dependent post-shock and
precursor parameters
data/* . 40 Individual set files
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See also:
J/ApJS/199/8 : A compilation of interstellar column densities (Gudennavar+,
2012)
J/ApJ/720/259 : CO column densities in dark clouds (Whittet+, 2010)
J/ApJ/710/613 : Broad HI absorbers (Danforth+, 2010)
J/ApJ/702/1472 : Column densities for HI, AlIII, SiIV, CIV, OVI (Savage+, 2009)
J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 2008)
J/ApJS/168/213 : Ionization states and cooling efficiencies (Gnat+, 2007)
J/ApJS/163/282 : Molecular hydrogen column densities (Wakker+, 2006)
J/A+A/414/949 : Interstellar bands and H2, CH, CO column densities (Weselak+
2004)
Byte-by-byte Description of file: sets.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [T_s=]
5- 7 E3.1 K Ts Shock temperature
9- 10 A2 --- --- [Z=]
11- 14 E4.1 Sun Z Gas metallicity (relative to solar)
16- 23 A8 --- B Magnetic field (strong-B (isochoric) or B=0)
25- 35 A11 --- File1 Post-shock filename in subdirectory data
37- 47 A11 --- File2 Precursor filename in subdirectory data
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Byte-by-byte Description of file: data/*
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 E12.2 cm-3.s n0*t Post-shock H density * Time (column 1)
14- 20 E7.2 cm-2 N(HI) N(HI) Column Density
22- 28 E7.2 cm-2 N(HII) N(HII) Column Density
30- 36 E7.2 cm-2 N(HeI) N(HeI) Column Density
38- 44 E7.2 cm-2 N(HeII) N(HeII) Column Density
46- 52 E7.2 cm-2 N(HeIII) N(HeIII) Column Density
54- 60 E7.2 cm-2 N(CI) N(CI) Column Density
62- 68 E7.2 cm-2 N(CII) N(CII) Column Density
70- 76 E7.2 cm-2 N(CIII) N(CIII) Column Density
78- 84 E7.2 cm-2 N(CIV) N(CIV) Column Density
86- 92 E7.2 cm-2 N(CV) N(CV) Column Density
94-100 E7.2 cm-2 N(CVI) N(CVI) Column Density
102-108 E7.2 cm-2 N(CVII) N(CVII) Column Density
110-116 E7.2 cm-2 N(NI) N(NI) Column Density
118-124 E7.2 cm-2 N(NII) N(NII) Column Density
126-132 E7.2 cm-2 N(NIII) N(NIII) Column Density
134-140 E7.2 cm-2 N(NIV) N(NIV) Column Density
142-148 E7.2 cm-2 N(NV) N(NV) Column Density
150-156 E7.2 cm-2 N(NVI) N(NVI) Column Density
158-164 E7.2 cm-2 N(NVII) N(NVII) Column Density
166-172 E7.2 cm-2 N(NVIII) N(NVIII) Column Density
174-180 E7.2 cm-2 N(OI) N(OI) Column Density
182-188 E7.2 cm-2 N(OII) N(OII) Column Density
190-196 E7.2 cm-2 N(OIII) N(OIII) Column Density
198-204 E7.2 cm-2 N(OIV) N(OIV) Column Density
206-212 E7.2 cm-2 N(OV) N(OV) Column Density
214-220 E7.2 cm-2 N(OVI) N(OVI) Column Density
222-228 E7.2 cm-2 N(OVII) N(OVII) Column Density
230-236 E7.2 cm-2 N(OVIII) N(OVIII) Column Density
238-244 E7.2 cm-2 N(OIX) N(OIX) Column Density
246-252 E7.2 cm-2 N(NeI) N(NeI) Column Density
254-260 E7.2 cm-2 N(NeII) N(NeII) Column Density
262-268 E7.2 cm-2 N(NeIII) N(NeIII) Column Density
270-276 E7.2 cm-2 N(NeIV) N(NeIV) Column Density
278-284 E7.2 cm-2 N(NeV) N(NeV) Column Density
286-292 E7.2 cm-2 N(NeVI) N(NeVI) Column Density
294-300 E7.2 cm-2 N(NeVII) N(NeVII) Column Density
302-308 E7.2 cm-2 N(NeVIII) N(NeVIII) Column Density
310-316 E7.2 cm-2 N(NeIX) N(NeIX) Column Density
318-324 E7.2 cm-2 N(NeX) N(NeX) Column Density
326-332 E7.2 cm-2 N(NeXI) N(NeXI) Column Density
334-340 E7.2 cm-2 N(MgI) N(MgI) Column Density
342-348 E7.2 cm-2 N(MgII) N(MgII) Column Density
350-356 E7.2 cm-2 N(MgIII) N(MgIII) Column Density
358-364 E7.2 cm-2 N(MgIV) N(MgIV) Column Density
366-372 E7.2 cm-2 N(MgV) N(MgV) Column Density
374-380 E7.2 cm-2 N(MgVI) N(MgVI) Column Density
382-388 E7.2 cm-2 N(MgVII) N(MgVII) Column Density
390-396 E7.2 cm-2 N(MgVIII) N(MgVIII) Column Density
398-404 E7.2 cm-2 N(MgIX) N(MgIX) Column Density
406-412 E7.2 cm-2 N(MgX) N(MgX) Column Density
414-420 E7.2 cm-2 N(MgXI) N(MgXI) Column Density
422-428 E7.2 cm-2 N(MgXII) N(MgXII) Column Density
430-436 E7.2 cm-2 N(MgXIII) N(MgXIII) Column Density
438-444 E7.2 cm-2 N(SiI) N(SiI) Column Density
446-452 E7.2 cm-2 N(SiII) N(SiII) Column Density
454-460 E7.2 cm-2 N(SiIII) N(SiIII) Column Density
462-468 E7.2 cm-2 N(SiIV) N(SiIV) Column Density
470-476 E7.2 cm-2 N(SiV) N(SiV) Column Density
478-484 E7.2 cm-2 N(SiVI) N(SiVI) Column Density
486-492 E7.2 cm-2 N(SiVII) N(SiVII) Column Density
494-500 E7.2 cm-2 N(SiVIII) N(SiVIII) Column Density
502-508 E7.2 cm-2 N(SiIX) N(SiIX) Column Density
510-516 E7.2 cm-2 N(SiX) N(SiX) Column Density
518-524 E7.2 cm-2 N(SiXI) N(SiXI) Column Density
526-532 E7.2 cm-2 N(SiXII) N(SiXII) Column Density
534-540 E7.2 cm-2 N(SiXIII) N(SiXIII) Column Density
542-548 E7.2 cm-2 N(SiXIV) N(SiXIV) Column Density
550-556 E7.2 cm-2 N(SiXV) N(SiXV) Column Density
558-564 E7.2 cm-2 N(SI) N(SI) Column Density
566-572 E7.2 cm-2 N(SII) N(SII) Column Density
574-580 E7.2 cm-2 N(SIII) N(SIII) Column Density
582-588 E7.2 cm-2 N(SIV) N(SIV) Column Density
590-596 E7.2 cm-2 N(SV) N(SV) Column Density
598-604 E7.2 cm-2 N(SVI) N(SVI) Column Density
606-612 E7.2 cm-2 N(SVII) N(SVII) Column Density
614-620 E7.2 cm-2 N(SVIII) N(SVIII) Column Density
622-628 E7.2 cm-2 N(SIX) N(SIX) Column Density
630-636 E7.2 cm-2 N(SX) N(SX) Column Density
638-644 E7.2 cm-2 N(SXI) N(SXI) Column Density
646-652 E7.2 cm-2 N(SXII) N(SXII) Column Density
654-660 E7.2 cm-2 N(SXIII) N(SXIII) Column Density
662-668 E7.2 cm-2 N(SXIV) N(SXIV) Column Density
670-676 E7.2 cm-2 N(SXV) N(SXV) Column Density
678-684 E7.2 cm-2 N(SXVI) N(SXVI) Column Density
686-692 E7.2 cm-2 N(SXVII) N(SXVII) Column Density
694-700 E7.2 cm-2 N(FeI) N(FeI) Column Density
702-708 E7.2 cm-2 N(FeII) N(FeII) Column Density
710-716 E7.2 cm-2 N(FeIII) N(FeIII) Column Density
718-724 E7.2 cm-2 N(FeIV) N(FeIV) Column Density
726-732 E7.2 cm-2 N(FeV) N(FeV) Column Density
734-740 E7.2 cm-2 N(FeVI) N(FeVI) Column Density
742-748 E7.2 cm-2 N(FeVII) N(FeVII) Column Density
750-756 E7.2 cm-2 N(FeVIII) N(FeVIII) Column Density
758-764 E7.2 cm-2 N(FeIX) N(FeIX) Column Density
766-772 E7.2 cm-2 N(FeX) N(FeX) Column Density
774-780 E7.2 cm-2 N(FeXI) N(FeXI) Column Density
782-788 E7.2 cm-2 N(FeXII) N(FeXII) Column Density
790-796 E7.2 cm-2 N(FeXIII) N(FeXIII) Column Density
798-804 E7.2 cm-2 N(FeXIV) N(FeXIV) Column Density
806-812 E7.2 cm-2 N(FeXV) N(FeXV) Column Density
814-820 E7.2 cm-2 N(FeXVI) N(FeXVI) Column Density
822-828 E7.2 cm-2 N(FeXVII) N(FeXVII) Column Density
830-836 E7.2 cm-2 N(FeXVIII) N(FeXVIII) Column Density
838-844 E7.2 cm-2 N(FeXIX) N(FeXIX) Column Density
846-852 E7.2 cm-2 N(FeXX) N(FeXX) Column Density
854-860 E7.2 cm-2 N(FeXXI) N(FeXXI) Column Density
862-868 E7.2 cm-2 N(FeXXII) N(FeXXII) Column Density
870-876 E7.2 cm-2 N(FeXXIII) N(FeXXIII) Column Density
878-884 E7.2 cm-2 N(FeXXIV) N(FeXXIV) Column Density
886-892 E7.2 cm-2 N(FeXXV) N(FeXXV) Column Density
894-900 E7.2 cm-2 N(FeXXVI) N(FeXXVI) Column Density
902-908 E7.2 cm-2 N(FeXXVII) N(FeXXVII) Column Density (column 113)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Sep-2012