Extragalactic CO emission lines in the CMB experiments: a forgotten signal and a foreground
International audience High resolution cosmic microwave background (CMB) experiments have allowed us to precisely measure the CMB temperature power spectrum down to very small scales (multipole $\ell \sim 3000$). Such measurements at multiple frequencies enable separating the primary CMB anisotropie...
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ftunivnantes:oai:HAL:hal-03982573v1 2023-05-15T18:23:00+02:00 Extragalactic CO emission lines in the CMB experiments: a forgotten signal and a foreground Maniyar, Abhishek S. Gkogkou, Athanasia Coulton, William R. Li, Zack Lagache, Guilaine Pullen, Anthony R. Laboratoire d'Astrophysique de Marseille (LAM) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) 2023-02-10 https://hal.science/hal-03982573 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/arxiv/2301.10764 hal-03982573 https://hal.science/hal-03982573 ARXIV: 2301.10764 INSPIRE: 2626540 https://hal.science/hal-03982573 2023 [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/preprint Preprints, Working Papers, . 2023 ftunivnantes 2023-03-08T00:51:46Z International audience High resolution cosmic microwave background (CMB) experiments have allowed us to precisely measure the CMB temperature power spectrum down to very small scales (multipole $\ell \sim 3000$). Such measurements at multiple frequencies enable separating the primary CMB anisotropies with other signals like CMB lensing, thermal and kinematic Sunyaev-Zel'dovich effects (tSZ and kSZ), and cosmic infrared background (CIB). In this paper, we explore another signal of interest at these frequencies that should be present in the CMB maps: extragalactic CO molecular rotational line emissions, which are the most widely used tracers of molecular gas in the line intensity mapping experiments. Using the SIDES simulations adopted for top hat bandpasses at 150 and 220 GHz, we show that the cross-correlation of the CIB with CO lines has a contribution similar to the CIB-tSZ correlation and the kSZ power, thereby contributing a non-negligible amount to the total power at these scales. This signal, therefore, may significantly impact the recently reported $\geq 3\sigma$ detection of the kSZ power spectrum from the South Pole Telescope (SPT) collaboration, as the contribution of the CO lines is not considered in such analyses. Our results also provide a new way of measuring the CO power spectrum in cross-correlation with the CIB. Finally, these results show that the CO emissions present in the CMB maps will have to be accounted for in all the CMB auto-power spectrum and cross-correlation studies involving a LSS tracer. Report South pole Université de Nantes: HAL-UNIV-NANTES South Pole |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Maniyar, Abhishek S. Gkogkou, Athanasia Coulton, William R. Li, Zack Lagache, Guilaine Pullen, Anthony R. Extragalactic CO emission lines in the CMB experiments: a forgotten signal and a foreground |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
description |
International audience High resolution cosmic microwave background (CMB) experiments have allowed us to precisely measure the CMB temperature power spectrum down to very small scales (multipole $\ell \sim 3000$). Such measurements at multiple frequencies enable separating the primary CMB anisotropies with other signals like CMB lensing, thermal and kinematic Sunyaev-Zel'dovich effects (tSZ and kSZ), and cosmic infrared background (CIB). In this paper, we explore another signal of interest at these frequencies that should be present in the CMB maps: extragalactic CO molecular rotational line emissions, which are the most widely used tracers of molecular gas in the line intensity mapping experiments. Using the SIDES simulations adopted for top hat bandpasses at 150 and 220 GHz, we show that the cross-correlation of the CIB with CO lines has a contribution similar to the CIB-tSZ correlation and the kSZ power, thereby contributing a non-negligible amount to the total power at these scales. This signal, therefore, may significantly impact the recently reported $\geq 3\sigma$ detection of the kSZ power spectrum from the South Pole Telescope (SPT) collaboration, as the contribution of the CO lines is not considered in such analyses. Our results also provide a new way of measuring the CO power spectrum in cross-correlation with the CIB. Finally, these results show that the CO emissions present in the CMB maps will have to be accounted for in all the CMB auto-power spectrum and cross-correlation studies involving a LSS tracer. |
author2 |
Laboratoire d'Astrophysique de Marseille (LAM) Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) |
format |
Report |
author |
Maniyar, Abhishek S. Gkogkou, Athanasia Coulton, William R. Li, Zack Lagache, Guilaine Pullen, Anthony R. |
author_facet |
Maniyar, Abhishek S. Gkogkou, Athanasia Coulton, William R. Li, Zack Lagache, Guilaine Pullen, Anthony R. |
author_sort |
Maniyar, Abhishek S. |
title |
Extragalactic CO emission lines in the CMB experiments: a forgotten signal and a foreground |
title_short |
Extragalactic CO emission lines in the CMB experiments: a forgotten signal and a foreground |
title_full |
Extragalactic CO emission lines in the CMB experiments: a forgotten signal and a foreground |
title_fullStr |
Extragalactic CO emission lines in the CMB experiments: a forgotten signal and a foreground |
title_full_unstemmed |
Extragalactic CO emission lines in the CMB experiments: a forgotten signal and a foreground |
title_sort |
extragalactic co emission lines in the cmb experiments: a forgotten signal and a foreground |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-03982573 |
geographic |
South Pole |
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South Pole |
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South pole |
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South pole |
op_source |
https://hal.science/hal-03982573 2023 |
op_relation |
info:eu-repo/semantics/altIdentifier/arxiv/2301.10764 hal-03982573 https://hal.science/hal-03982573 ARXIV: 2301.10764 INSPIRE: 2626540 |
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1766202427037450240 |