Author:
Jimenez Raul,Moresco Michele,Verde Licia,Wandelt Benjamin D.
Abstract
Abstract
We present a proof-of-principle determination of the Hubble parameter H(z) from
photometric data, obtaining a determination at an effective redshift of z = 0.75 (0.65 < z < 0.85)
of H(0.75) = 105.0±7.9(stat)±7.3(sys) km s-1 Mpc-1, with 7.5% statistical and
7% systematic (10% with statistical and systematics combined in quadrature) accuracy. This is
obtained in a cosmology model-independent fashion, but assuming a linear age-redshift relation in
the relevant redshift range, as such, it can be used to constrain arbitrary cosmologies as long as
H(z) can be considered slowly varying over redshift. In particular, we have applied a neural
network, trained on a well-studied spectroscopic sample of 140 objects, to the COSMOS2015
survey to construct a set of 19 thousand near-passively evolving galaxies and build an
age-redshift relation. The Hubble parameter is given by the derivative of the red envelope of the
age-redshift relation. This is the first time the Hubble parameter is determined from photometry
at ≲ 10% accuracy. Accurate H(z) determinations could help shed light on the Hubble
tension; this study shows that photometry, with a reduction of only a factor of two in the
uncertainty, could provide a new perspective on the tension.
Subject
Astronomy and Astrophysics
Cited by
5 articles.
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