TDCOSMO

dc.contributor.authorMotta, Verónica
dc.date.accessioned2021-11-22T13:32:48Z
dc.date.available2021-11-22T13:32:48Z
dc.date.issued2020
dc.description.abstractTime-delay cosmography of lensed quasars has achieved 2.4% precision on the measurement of the Hubble constant, H0. As part of an ongoing effort to uncover and control systematic uncertainties, we investigate three potential sources: 1- stellar kinematics, 2- line-of-sight effects, and 3- the deflector mass model. To meet this goal in a quantitative way, we reproduced the H0LiCOW/SHARP/STRIDES (hereafter TDCOSMO) procedures on a set of real and simulated data, and we find the following. First, stellar kinematics cannot be a dominant source of error or bias since we find that a systematic change of 10% of measured velocity dispersion leads to only a 0.7% shift on H0 from the seven lenses analyzed by TDCOSMO. Second, we find no bias to arise from incorrect estimation of the line-of-sight effects. Third, we show that elliptical composite (stars + dark matter halo), power-law, and cored power-law mass profiles have the flexibility to yield a broad range in H0 values. However, the TDCOSMO procedures that model the data with both composite and power-law mass profiles are informative. If the models agree, as we observe in real systems owing to the “bulge-halo” conspiracy, H0 is recovered precisely and accurately by both models. If the two models disagree, as in the case of some pathological models illustrated here, the TDCOSMO procedure either discriminates between them through the goodness of fit, or it accounts for the discrepancy in the final error bars provided by the analysis. This conclusion is consistent with a reanalysis of six of the TDCOSMO (real) lenses: the composite model yields H0 = 74.0−1.8+1.7 km s−1 Mpc−1, while the power-law model yields 74.2−1.6+1.6 km s−1 Mpc−1. In conclusion, we find no evidence of bias or errors larger than the current statistical uncertainties reported by TDCOSMO.en_ES
dc.facultadFacultad de Cienciasen_ES
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201937351
dc.identifier.urihttp://repositoriobibliotecas.uv.cl/handle/uvscl/2697
dc.language.isoenen_ES
dc.publisherEuropean Southern Observatoryen_ES
dc.sourceAstronomy & Astrophysicsen_ES
dc.subjectGRAVITATIONAL LENSING: STRONGen_ES
dc.subjectMETHODS: DATA ANALYSISen_ES
dc.titleTDCOSMOen_ES
dc.title.alternativeI. An exploration of systematic uncertainties in the inference of H0 from time-delay cosmographyen_ES
dc.typeArticuloen_ES
uv.catalogadorRCR DIBRAen_ES
uv.departamentoInstituto de Fisica y Astronomiaen_ES
uv.notageneralVarios autoresen_ES

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