J/MNRAS/506/4389ivo://CDS.VizieR/J/MNRAS/506/4389doi:10.26093/cds/vizier.75064389CDSGaikwad P.Srianand R.Haehnelt M.G.Choudhury T.R.2024-11-06T20:34:15Z2024-07-23T14:12:05ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frquasarsintergalactic-mediumvisible-astronomyinfrared-astronomyspectroscopyredshiftedWe characterize the thermal state of the intergalactic medium (IGM) in 10 redshift bins in the range 2 <= z <= 4 with a sample of 103 high-resolution, high S/N Ly{alpha} forest spectra using four different flux distribution statistics. Our measurements are calibrated with mock spectra from a large suite of hydrodynamical simulations post-processed with our thermal IGM evolution code cite, finely sampling amplitude, and slope of the expected temperature-density relation. The thermal parameters inferred from our measurements of the flux power spectrum, Doppler parameter distribution, as well as wavelet and curvature statistics agree well within their respective errors and all clearly show the peak in temperature and minimum in slope of the temperature density relation expected from He II reionization. Combining our measurements from the different flux statistics gives T_0_ = (14750 +/- 1322) K for the peak temperature at mean density and a corresponding minimum slope {gamma} = 1.225 +/- 0.120. The peak in the temperature evolution occurs around z =~ 3, in agreement with previous measurements that had suggested the presence of such a peak, albeit with a large scatter. Using CITE, we also calculate the thermal state of the IGM predicted by five widely used (spatially homogeneous) UV-background models. The rather rapid thermal evolution inferred by our measurements is well reproduced by two of the models, if we assume (physically well motivated) non-equilibrium evolution with photoheating rates that are reduced by a moderate factor of ~0.7-0.8. The other three models predict He II reionization to be more extended with a higher temperature peak occurring somewhat earlier than our measurements suggest.2021MNRAS.506.4389Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/506/4389CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/150/111 : KODIAQ DR1 (O'Meara+, 2015)J/AJ/154/114 : KODIAQ DR2 (O'Meara+, 2017)J/MNRAS/482/3458 : UVES Spectral Quasar Absorption Database DR1 (Murphy+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/506/4389https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/506/4389http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/506/4389https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/506/4389https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/506/4389http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/506/4389GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/506/4389/tableqso (The 104 QSOs sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/506/4389/tableqso?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/506/4389/tableqso?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/506/4389/tableqso?GETtext/xml+votable180.050000true348.35189280.57905110.0055555555555555566/6 8 592 993 2172 2247 2611 4027 4259 4950 5051 5563 5952 6010 6030 6205 6219 6853 7309 7500 7964 8345 8552 8912 9114 9272 9412 9759 9806 10074 10140 10405 10752 10843 10994 11040 11107 11339 11529 11581 11596 16500 16652 16654 17244 17404 17510 17735 17749 17772 17778 17805 18030 18060 18101 18271 18521 18582 18642 18858 18880 19087 19416 19680 19734 20032 20202 21180 22576 22578 22594 22715 22917 23203 23210 25285 26269 26479 27416 27549 27578 27654 27846 28042 28532 28611 28648 30029 31622 35585 35772 35916 36417 36495 36784 40274 43903 47001 48567 48610https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/506/4389?format=asciiOpticalInfrareddefaultJ/MNRAS/506/4389/tableqsoThe 104 QSOs sampleSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintQSOQSOs name (JHHMMSS+DDMMSSA) as in KODIAQ database (1)meta.id;meta.maincharz[2.083/4.558] Ly-alpha emission line derived redshift (1)src.redshiftfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/506/4389/tablefps*Observed Ly-alpha forest FPS statistics extracted from KODIAQ-DR2 SamplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzMean Redshift of the statistics [zmin,zmax] = [zmean-0.1, zmean+0.1] (z) (1)src.redshiftfloatkFourier mode k of the velocity v in km/s (k)s/kmstat.fit.paramdoubleFPS1D Dimensionless flux power spectrum (k*P_F_k/pi) (2)meta.notedoublee_FPSMean uncertainty 1{sigma} of P (e_k*P_F_k/pi)stat.errordoubleJ/MNRAS/506/4389/tablews*Observed Ly-alpha forest WS Statistics extracted from KODIAQ-DR2 SamplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzMean Redshift of the statistics [zmin,zmax] = [zmean-0.1, zmean+0.1] (1)src.redshiftfloatwsWavelet Scale related to the velocity (s_n_) (2)km/sarith.factorfloatlogAsnLogarithm of the wavelet amplitude (logA_Sn_) (3)src.var.amplitudedoublePDFNormalized probability distribution function of log-wavelet amplitude (dP/logA_Sn_)stat.fit.goodnessdoublee_PDFMean uncertainty 1{sigma} of PDF (e_dP/logAsn)stat.errordoubleJ/MNRAS/506/4389/tablecs*Observed Ly-alpha forest CS Statistics extracted from KODIAQ-DR2 SamplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzMean Redshift of the statistics [zmin,zmax] = [zmean-0.1, zmean+0.1] (1)src.redshiftfloatkappaLogarithm of the curvature measure {kappa} ({kappa}) (2)stat.fit.paramdoublePDFNormalized probability distribution function of log-curvature (dP/dlogk)stat.fit.goodnessdoublee_PDFMean uncertainty 1{sigma} of PDF (e_dP/dlogk)stat.errordoubleJ/MNRAS/506/4389/tableb*Observed Ly-alpha forest b-parameter Statistics extracted from KODIAQ-DR2 SamplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintzMean Redshift of the statistics [zmin,zmax] = [zmean-0.1, zmean+0.1] (z) (1)src.redshiftfloatlogNHIl[12.8/14.4] Logarithm of the lower value of H I column density N_HI_ bin (logNHI_lower)log(cm**-2)phys.columnDensityfloatlogNHIh[13/14.6] Logarithm of higher value of H I column density N_HI_ bin (logNHI_higher)log(cm**-2)phys.columnDensityfloatlogbLogarithm of the doppler b parameter (logb)log(km.s**-1)spect.dopplerParamdoublePDFNormalized probability distribution function of log-b parameter (dP/dlogb)stat.fit.goodnessdoublee_PDFMean uncertainty 1{sigma} of PDF (e_dP/dlogb)stat.errordouble