Speaker
Description
I will introduce two new methods for large-scale structure (LSS) studies in mm-wave astronomy: (1) redshift tomography and (2) map-level density reconstruction, and demonstrate them with data to probe the thermal SZ history, cosmic infrared background (CIB), and Milky Way dust.
For the first method, I will focus on a new CIB tomography result in Chiang+2025, where we deproject 11 sky intensity maps from Planck, Herschel, and IRAS by cross-correlating diffuse photons in each band with galaxies and quasars from SDSS/BOSS/eBOSS in a tomographic manner. By combining hundreds of redshift- and frequency-dependent two-point function amplitudes, we achieve a 60-sigma detection of the evolving CIB spectrum over 0 < z < 4. This establishes a CIB benchmark for future CMB experiments and provides a complete census of cosmic dust and star formation history. Additionally, we detect the SZ background and, for the first time, cosmic CO and [CII] lines on top of the CIB continuum without line confusion.
For the second method, we reconstruct the LSS (CIB+SZ) field in mm-wave data at the map level, with the Fourier phases of the cosmic web fully constrained by 600 million WISE galaxies—the largest existing galaxy catalog. I will present the first example at 100 microns from Chiang 2023, where we strip the CIB from the SFD Milky Way dust map. I will also discuss the extension to 3D reconstruction and an ongoing project to apply the method to all Planck HFI bands, delivering a full-sky legacy component separation product for the CMB community.
| Would you be interested in presenting a poster if the conference is oversubcribed? | No |
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