Constraints on CMBR flux due to high-z dust emission
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866915813831737344 |
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| author | Lopez-Corredoira, Martin |
| author_facet | Lopez-Corredoira, Martin |
| contents | Gjergo & Kroupa (2025) have proposed a new foreground CMBR component produced by dust associated with the progenitor clouds at $z=15-20$ that led to the formation of massive early-type galaxies, calculating that a minimum of 1.4% and a maximum of 100% of the whole CMBR radiation would be produced by this mechanism. Here, I check how much dust emission is compatible with the spectrum of the CMBR monopole flux measurements within the corresponding errors. COBE-FIRAS monopole is fitted to different models with different dust emissivity spectral indexes ($β$) and dispersion of redshifts of the progenitor clouds ($σ_d$). Within the realistic values of $β\ge 0.5$, $σ_d\ge 0.8$, the contamination of CMBR flux by high $z$ dust should be $<1.3$% (95% CL). |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_20916 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Constraints on CMBR flux due to high-z dust emission Lopez-Corredoira, Martin Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Gjergo & Kroupa (2025) have proposed a new foreground CMBR component produced by dust associated with the progenitor clouds at $z=15-20$ that led to the formation of massive early-type galaxies, calculating that a minimum of 1.4% and a maximum of 100% of the whole CMBR radiation would be produced by this mechanism. Here, I check how much dust emission is compatible with the spectrum of the CMBR monopole flux measurements within the corresponding errors. COBE-FIRAS monopole is fitted to different models with different dust emissivity spectral indexes ($β$) and dispersion of redshifts of the progenitor clouds ($σ_d$). Within the realistic values of $β\ge 0.5$, $σ_d\ge 0.8$, the contamination of CMBR flux by high $z$ dust should be $<1.3$% (95% CL). |
| title | Constraints on CMBR flux due to high-z dust emission |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2602.20916 |