Constraints on galaxy formation from the cosmic-infrared-background$\,-\,$optical-imaging cross-correlation using $\boldsymbol{Herschel}$ and UNIONS - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2022

Constraints on galaxy formation from the cosmic-infrared-background$\,-\,$optical-imaging cross-correlation using $\boldsymbol{Herschel}$ 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 $\it{Herschel}$-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 $91\,{\rm deg}^2$ and a minimum resolved scale of $18\,$arcsec, 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 $\gtrsim 22\,\sigma$ ($\gtrsim 18\,\sigma$ for the background map). The part of the optical brightness variations that are correlated with the submm emission translates to an rms brightness of $\simeq 32.5\,{\rm mag}\,{\rm arcsec}^{-2}$ 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 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 $P(k)\propto 1/k$, 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 ${\it Euclid}$ 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)

Identifiants

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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-background$\,-\,$optical-imaging cross-correlation using $\boldsymbol{Herschel}$ and UNIONS. 2022. ⟨hal-03644399⟩
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