| Full text | |
| Author(s): |
Kokron, Nickolas
;
Bernal, Jose Luis
;
Dunkley, Jo
Total Authors: 3
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW D; v. 110, n. 10, p. 20-pg., 2024-11-21. |
| Abstract | |
We investigate the potential of CO rotational lines at redshifts z similar to 0-6 being an appreciable source of extragalactic foreground anisotropies in the cosmic microwave background. Motivated by previous investigations, we specifically focus on the frequency bands and small scales probed by ground-based surveys. Using an empirical parametrization for the relation between the infrared luminosity of galaxies and their CO line luminosity, conditioned on sub-mm observations of CO luminosity functions from J = 1 to J = 7 at nu = {100, 250} GHz, we explore how uncertainty in the CO luminosity function translates into uncertainty in the signature of CO emission in the cosmic microwave background. We find that at l = 3000 the amplitude of both CO autocorrelation and cross-correlation with the cosmic infrared background could be detectable in an ACT-like experiment with 90, 150 and 220 GHz bands, even in the scenarios with the lowest amplitude consistent with sub-mm data. We also investigate, for the first time, the amplitude of the COx cosmic infrared background correlation between different frequency bands and find that our model predicts that this signal could be comparable to the amplitude of the cosmic infrared background frequency cross-correlation at certain wavelengths. This implies current observations can potentially be used to constrain the bright end of CO luminosity functions, which are difficult to probe with current sub-mm telescopes due to the small volumes they survey. Our findings corroborate past results and have significant implications in template-based searches for cosmic microwave background secondaries, such as the kinetic Sunyaev Zel'dovich effect, using the frequency-dependent high-l temperature-temperature power spectrum. (AU) | |
| FAPESP's process: | 21/14335-0 - ICTP South American Institute for Fundamental Research: a regional center for Theoretical Physics |
| Grantee: | Nathan Jacob Berkovits |
| Support Opportunities: | Special Projects |