A Reliable Calibration of H ii Galaxies Hubble Diagram with Cosmic Chronometers and Artificial Neural Network

The L – σ relation of H ii galaxies (HIIGx) calibrated by a distance indicator is a reliable standard candle for measuring the Hubble constant H 0 . The most straightforward calibration technique anchors them with the first tier of distance ladders from the same galaxies. Recently another promising...

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Bibliographic Details
Published in:The Astrophysical journal 2022-09, Vol.936 (1), p.21
Main Authors: Zhang, Jian-Chen, Jiao, Kang, Zhang, Tingting, Zhang, Tong-Jie, Yu, Bo
Format: Article
Language:English
Subjects:
Artificial neural networks
Astronomical models
Astronomy data analysis
Astrophysics
Calibration
Chronometers
Cosmology
Galaxies
H II regions
Hubble constant
Hubble diagram
Ladders
Measuring instruments
Neural networks
Standard candles
Stars & galaxies
Supernovae
Type Ia supernovae
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Summary:The L – σ relation of H ii galaxies (HIIGx) calibrated by a distance indicator is a reliable standard candle for measuring the Hubble constant H 0 . The most straightforward calibration technique anchors them with the first tier of distance ladders from the same galaxies. Recently another promising method that uses the cosmological model–independent cosmic chronometers as a calibrator has been proposed. We promote this technique by removing the assumptions about the cosmic flatness and using a nonparametric artificial neural network for the data reconstruction process. We observe a correlation between the cosmic curvature density parameter and the slope of the L – σ relation, thereby improving the reliability of the calibration. Using the calibrated HIIGx Hubble diagram, we obtain a Type Ia supernovae Hubble diagram free of the conventional assumption about H 0 . Finally we get a value of H 0 = 65.9 − 2.9 + 3.0 km s − 1 Mpc − 1 , which is compatible with the latest Planck 18 measurement.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac85aa