Issue |
A&A
Volume 691, November 2024
|
|
---|---|---|
Article Number | A262 | |
Number of page(s) | 19 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/202450304 | |
Published online | 19 November 2024 |
[CII] line intensity mapping the epoch of reionization with the Prime-Cam on FYST
II. CO foreground masking based on an external catalog
1
Argelander Institut für Astronomie, Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
2
Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM, 91191 Gif-sur-Yvette, France
3
Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL, 32611, USA
4
I. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
⋆ Corresponding author; karoumpis@astro.uni-bonn.de
Received:
9
April
2024
Accepted:
9
October
2024
Context. The Fred Young Submillimeter Telescope (FYST) line intensity mapping (LIM) survey will measure the power spectrum (PS) of the singly ionized carbon 158 μm fine-structure line, [CII], to trace the appearance of the first galaxies that emerged during and right after the epoch of reionization (EoR, 6 < z < 9).
Aims. We aim to quantify the contamination of the (post-)EoR [CII] LIM signal by foreground carbon monoxide (CO) line emission (3 < Jup < 12) and assess the efficiency to retrieve this [CII] LIM signal by the targeted masking of bright CO emitters.
Methods. Using the IllustrisTNG300 simulation, we produced mock CO intensity tomographies based on empirical star formation rate-to-CO luminosity relations. Combining these predictions with the [CII] PS predictions of the first paper of this series, we evaluated a masking technique where the interlopers are identified and masked using an external catalog whose properties are equivalent to those of a deep Euclid survey.
Results. Prior to masking, our [CII] PS forecast is an order of magnitude lower than the predicted CO contamination in the 225 GHz ([CII] emitted at z = 6.8 − 8.3) band of the FYST LIM survey, at the same level in its 280 GHz ([CII] emitted at z = 5.3 − 6.3) and 350 GHz ([CII] emitted at z = 4.1 − 4.8) bands, and an order of magnitude higher in its 410 GHz ([CII] emitted at z = 3.4 − 3.9) band. For our fiducial model, the optimal masking depth is reached when less than 10% of the survey volume is masked at 350 and 410 GHz but around 40% at 280 GHz and 60% at 225 GHz. At these masking depths we anticipate a detection of the [CII] PS at 350 and 410 GHz, a tentative detection at 280 GHz, whereas at 225 GHz the CO signal still dominates our model. In the last case, alternative decontamination techniques will be needed.
Key words: ISM: lines and bands / galaxies: evolution / galaxies: high-redshift / galaxies: luminosity function / mass function / galaxies: star formation / galaxies: statistics
© ESO 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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