Constraints on galaxy formation from the cosmic-far-infrared-background - optical-imaging cross-correlation using Herschel and UNIONS
Monthly Notices of the Royal Astronomical Society(2022)
Abstract
Using Herschel-SPIRE imaging and the Canada-France Imaging Survey
(CFIS) Low Surface Brightness data products from the Ultraviolet Near-Infrared
Optical Northern Survey (UNIONS), we present a cross-correlation between the
cosmic far-infrared background and cosmic optical background fluctuations. The
cross-spectrum is measured for two cases: all galaxies are kept in the images;
or all individually-detected galaxies are masked to produce `background' maps.
We report the detection of the cross-correlation signal at ≳ 18 σ
(≳ 14 σ for the background map). The part of the optical
brightness variations that are correlated with the submm emission translates to
an rms brightness of ≃ 32.5 mag arcsec^-2 in the r
band, a level normally unreachable for individual sources. A critical issue is
determining what fraction of the cross-power spectrum might be caused by
emission from Galactic cirrus. For one of the fields, the Galactic
contamination is 10 times higher than the extragalactic signal; however, for
the other fields, the contamination is around 20 per cent. An additional
discriminant is that the cross-power spectrum is of the approximate form
P(k)∝ 1/k, much shallower than that of Galactic cirrus. We interpret
the results in a halo-model framework, which shows good agreement with
independent measurements for the scalings of star-formation rates in galaxies.
The approach presented in this study holds great promise for future surveys
such as FYST/CCAT-prime combined with Euclid or the Vera Rubin
Observatory (LSST), which will enable a detailed exploration of the evolution
of star formation in galaxies.
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