Forecasting the cross correlation of Terahertz Intensity Mapper [CII] line intensity maps with Euclid galaxies
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| author | Bracks, Justin S. Keenan, Ryan P. Agrawal, Shubh Keating, Garrett K. Aguirre, James E. Lidz, Adam Bradford, Charles M. Brendal, Brockton Filippini, Jeffrey Fu, Jianyang Garcia, Karolina Groppi, Christopher Hailey-Dunsheath, Steven Janssen, Reinier M. J. Kang, Wooseok Liu, Lun-Jun Lowe, Ian Manduca, Alex Marrone, Daniel P. Mauskopf, Philip Mayer, Evan C. O'Donnell, Sydnee Saeid, Talia Tartakovsky, Simon Cuyck, Mathilde Vieira, Joaquin D. Zebrowski, Jessica A. |
| author_facet | Bracks, Justin S. Keenan, Ryan P. Agrawal, Shubh Keating, Garrett K. Aguirre, James E. Lidz, Adam Bradford, Charles M. Brendal, Brockton Filippini, Jeffrey Fu, Jianyang Garcia, Karolina Groppi, Christopher Hailey-Dunsheath, Steven Janssen, Reinier M. J. Kang, Wooseok Liu, Lun-Jun Lowe, Ian Manduca, Alex Marrone, Daniel P. Mauskopf, Philip Mayer, Evan C. O'Donnell, Sydnee Saeid, Talia Tartakovsky, Simon Cuyck, Mathilde Vieira, Joaquin D. Zebrowski, Jessica A. |
| contents | We forecast that the Terahertz Intensity Mapper (TIM) cross-correlated with Euclid's Fornax deep field (EDF-F), TIM$\times$EDF-F, will detect the [CII]-galaxy cross-power spectrum at a median redshift of 1.1 with $\gtrsim 7 σ$ confidence. The Poisson component of the cross-power spectrum at $0.1 \leq k \leq 10$ hMpc$^{-1}$ (i.e. cross-shot noise) will be detected at $\gtrsim 3 σ$ in 4 bins spanning $0.5 < z< 1.7$. This measurement will constrain the mean [CII] specific intensity over half of cosmic history and assess the degree to which Euclid-selected galaxies account for the [CII] intensity observed by TIM. We find that TIM can detect the cross-power spectrum across a wide range of [CII] intensity models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_24204 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Forecasting the cross correlation of Terahertz Intensity Mapper [CII] line intensity maps with Euclid galaxies Bracks, Justin S. Keenan, Ryan P. Agrawal, Shubh Keating, Garrett K. Aguirre, James E. Lidz, Adam Bradford, Charles M. Brendal, Brockton Filippini, Jeffrey Fu, Jianyang Garcia, Karolina Groppi, Christopher Hailey-Dunsheath, Steven Janssen, Reinier M. J. Kang, Wooseok Liu, Lun-Jun Lowe, Ian Manduca, Alex Marrone, Daniel P. Mauskopf, Philip Mayer, Evan C. O'Donnell, Sydnee Saeid, Talia Tartakovsky, Simon Cuyck, Mathilde Vieira, Joaquin D. Zebrowski, Jessica A. Astrophysics of Galaxies We forecast that the Terahertz Intensity Mapper (TIM) cross-correlated with Euclid's Fornax deep field (EDF-F), TIM$\times$EDF-F, will detect the [CII]-galaxy cross-power spectrum at a median redshift of 1.1 with $\gtrsim 7 σ$ confidence. The Poisson component of the cross-power spectrum at $0.1 \leq k \leq 10$ hMpc$^{-1}$ (i.e. cross-shot noise) will be detected at $\gtrsim 3 σ$ in 4 bins spanning $0.5 < z< 1.7$. This measurement will constrain the mean [CII] specific intensity over half of cosmic history and assess the degree to which Euclid-selected galaxies account for the [CII] intensity observed by TIM. We find that TIM can detect the cross-power spectrum across a wide range of [CII] intensity models. |
| title | Forecasting the cross correlation of Terahertz Intensity Mapper [CII] line intensity maps with Euclid galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2602.24204 |