Integrated column densities vs shock ageJ/ApJ/729/82ivo://CDS.VizieR/J/ApJ/729/82doi:10.26093/cds/vizier.17290082CDSGnat O.2018-01-16T14:50:05Z2012-11-27T15:51:31ZCDS support teamCDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, Francecds-question@unistra.fratomic-physicschemical-abundancesinterstellar-mediumI 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.2011ApJ...729...82Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/729/82CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/199/8 : A compilation of interstellar column densities (Gudennavar+,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+https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/729/82https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/729/82http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/729/82https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/729/82https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/729/82http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/729/82GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefault
J/ApJ/729/82/setsSet of the age-dependent post-shock and precursor parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTsShock temperatureKphys.temperaturefloatZGas metallicity (relative to solar)Sunphys.abund.ZfloatBMagnetic field (strong-B (isochoric) or B=0)meta.notecharFile1Post-shock filename in subdirectory datameta.id;meta.filecharFile2Precursor filename in subdirectory datameta.id;meta.filechar