Pré-Publication, Document De Travail Année : 2022

Constraints on galaxy formation from the cosmic-infrared-backgroundoptical-imaging cross-correlation using Herschel and UNIONS

Seunghwan Lim
  • Fonction : Auteur
Ryley Hill
  • Fonction : Auteur
Douglas Scott
Ludovic van Waerbeke
  • Fonction : Auteur
Raymond G. Carlberg
  • Fonction : Auteur
Nora Elisa Chisari
  • Fonction : Auteur
Andrej Dvornik
  • Fonction : Auteur
Thomas Erben
  • Fonction : Auteur
Stephen Gwyn
Alan W. Mcconnachie
  • Fonction : Auteur
Angus H. Wright
  • Fonction : Auteur

Résumé

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 infrared background and cosmic optical background fluctuations. With a combined sky area of 91deg2 and a minimum resolved scale of 18arcsec, 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 22σ (18σ for the background map). The part of the optical brightness variations that are correlated with the submm emission translates to an rms brightness of 32.5magarcsec2 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 approximately a factor of 10 higher than the extragalactic signal, with the contamination being estimated using a linear regression from several external survey maps; however, for the other fields, the contamination is typically 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.

Dates et versions

hal-03644399 , version 1 (19-04-2022)

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Seunghwan Lim, Ryley Hill, Douglas Scott, Ludovic van Waerbeke, Jean-Charles Cuillandre, et al.. Constraints on galaxy formation from the cosmic-infrared-backgroundoptical-imaging cross-correlation using Herschel and UNIONS. 2022. ⟨hal-03644399⟩
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