Detection of the Galaxy--Galaxy--Temperature Skewed Bispectrum
Abstract
We present the first measurement of the galaxy--galaxy--temperature skewed bispectrum, obtained by cross-correlating the squared, filtered unWISE galaxy overdensity with \textit{Planck} maps at 100, 143, 217, and 353~GHz. The signal is detected with high significance in all four channels. Its frequency dependence reveals contributions from hot gas through the thermal Sunyaev--Zel'dovich (tSZ) effect and from dust through the cosmic infrared background (CIB). With the galaxy occupation fixed, our halo-model fits favor higher integrated pressure and peak star-formation efficiency for the galaxy--temperature cross-spectra than for the skewed bispectrum. Comparisons with component-separated tSZ and CIB maps from the same \textit{Planck} observations indicate that this mismatch is not confined to the frequency-map fits. This difference motivates testing more flexible descriptions of gas pressure, CIB emission, and galaxy occupation. In particular, it could point to a mass dependence of the gas-pressure profile that our model does not fully capture. By giving greater weight to massive halos that host many galaxy pairs, the skewed bispectrum provides a complementary test of these descriptions, using information beyond two-point statistics at a comparable computational cost.
Related
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BibTeX
@misc{keja2026detection,
title = {{Detection of the Galaxy--Galaxy--Temperature Skewed Bispectrum}},
author = {I. J. Keja and D. Karagiannis and W. R. Coulton and P. D. Meerburg},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.03580},
eprint = {2611.03580},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.03580},
}
RIS
TY - UNPB
TI - Detection of the Galaxy--Galaxy--Temperature Skewed Bispectrum
AU - I. J. Keja
AU - D. Karagiannis
AU - W. R. Coulton
AU - P. D. Meerburg
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.03580
UR - https://arxiv.org/abs/2611.03580
AB - We present the first measurement of the galaxy--galaxy--temperature skewed bispectrum, obtained by cross-correlating the squared, filtered unWISE galaxy overdensity with \textit{Planck} maps at 100, 143, 217, and 353~GHz. The signal is detected with high significance in all four channels. Its frequency dependence reveals contributions from hot gas through the thermal Sunyaev--Zel'dovich (tSZ) effect and from dust through the cosmic infrared background (CIB). With the galaxy occupation fixed, our halo-model fits favor higher integrated pressure and peak star-formation efficiency for the galaxy--temperature cross-spectra than for the skewed bispectrum. Comparisons with component-separated tSZ and CIB maps from the same \textit{Planck} observations indicate that this mismatch is not confined to the frequency-map fits. This difference motivates testing more flexible descriptions of gas pressure, CIB emission, and galaxy occupation. In particular, it could point to a mass dependence of the gas-pressure profile that our model does not fully capture. By giving greater weight to massive halos that host many galaxy pairs, the skewed bispectrum provides a complementary test of these descriptions, using information beyond two-point statistics at a comparable computational cost.
ER -