COMAP Early Science. V. Constraints and Forecasts at z ~ 3
Abstract
We present the current state of models for the z ~ 3 carbon monoxide (CO) line intensity signal targeted by the CO Mapping Array Project (COMAP) Pathfinder in the context of its early science results. Our fiducial model, relating dark matter halo properties to CO luminosities, informs parameter priors with empirical models of the galaxy–halo connection and previous CO (1–0) observations. The Pathfinder early science data spanning wavenumbers k = 0.051–0.62 Mpc–1 represent the first direct 3D constraint on the clustering component of the CO (1–0) power spectrum. Our 95% upper limit on the redshift-space clustering amplitude Aclust ≲ 70 μK2 greatly improves on the indirect upper limit of 420 μK2 reported from the CO Power Spectrum Survey (COPSS) measurement at k ~ 1 Mpc–1. The COMAP limit excludes a subset of models from previous literature and constrains interpretation of the COPSS results, demonstrating the complementary nature of COMAP and interferometric CO surveys. Using line bias expectations from our priors, we also constrain the squared mean line intensity–bias product, $${\left\langle {Tb}\right\rangle }_{2}$$ ≲ 50 μK2, and the cosmic molecular gas density, ρH2 < 2.5 × 108 M⊙ Mpc–3 (95% upper limits). Based on early instrument performance and our current CO signal estimates, we forecast that the 5 yr Pathfinder campaign will detect the CO power spectrum with overall signal-to-noise ratio of 9–17. Between then and now, we also expect to detect the CO–galaxy cross-spectrum using overlapping galaxy survey data, enabling enhanced inferences of cosmic star formation and galaxy evolution history.
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- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- Contributing Org.:
- COMAP Collaboration
- OSTI Identifier:
- 1882172
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 933; Journal Issue: 2; Journal ID: ISSN 0004-637X
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; CO line emission; Cosmological evolution; High-redshift galaxies; Molecular gas; Radio astronomy
Citation Formats
Chung, Dongwoo T., Breysse, Patrick C., Cleary, Kieran A., Ihle, Håvard T., Padmanabhan, Hamsa, Silva, Marta B., Richard Bond, J., Borowska, Jowita, Catha, Morgan, Church, Sarah E., Dunne, Delaney A., Kristian Eriksen, Hans, Kristine Foss, Marie, Gaier, Todd, Ott Gundersen, Joshua, Harper, Stuart E., Harris, Andrew I., Hensley, Brandon, Hobbs, Richard, Keating, Laura C., Kim, Junhan, Lamb, James W., Lawrence, Charles R., Gahr Sturtzel Lunde, Jonas, Murray, Norman, Pearson, Timothy J., Philip, Liju, Rasmussen, Maren, Readhead, Anthony S., Rennie, Thomas J., Stutzer, Nils-Ole, Uzgil, Bade D., Viero, Marco P., Watts, Duncan J., Wechsler, Risa H., Kathrine Wehus, Ingunn, and Woody, David P. COMAP Early Science. V. Constraints and Forecasts at z ~ 3. United States: N. p., 2022.
Web. doi:10.3847/1538-4357/ac63c7.
Chung, Dongwoo T., Breysse, Patrick C., Cleary, Kieran A., Ihle, Håvard T., Padmanabhan, Hamsa, Silva, Marta B., Richard Bond, J., Borowska, Jowita, Catha, Morgan, Church, Sarah E., Dunne, Delaney A., Kristian Eriksen, Hans, Kristine Foss, Marie, Gaier, Todd, Ott Gundersen, Joshua, Harper, Stuart E., Harris, Andrew I., Hensley, Brandon, Hobbs, Richard, Keating, Laura C., Kim, Junhan, Lamb, James W., Lawrence, Charles R., Gahr Sturtzel Lunde, Jonas, Murray, Norman, Pearson, Timothy J., Philip, Liju, Rasmussen, Maren, Readhead, Anthony S., Rennie, Thomas J., Stutzer, Nils-Ole, Uzgil, Bade D., Viero, Marco P., Watts, Duncan J., Wechsler, Risa H., Kathrine Wehus, Ingunn, & Woody, David P. COMAP Early Science. V. Constraints and Forecasts at z ~ 3. United States. https://doi.org/10.3847/1538-4357/ac63c7
Chung, Dongwoo T., Breysse, Patrick C., Cleary, Kieran A., Ihle, Håvard T., Padmanabhan, Hamsa, Silva, Marta B., Richard Bond, J., Borowska, Jowita, Catha, Morgan, Church, Sarah E., Dunne, Delaney A., Kristian Eriksen, Hans, Kristine Foss, Marie, Gaier, Todd, Ott Gundersen, Joshua, Harper, Stuart E., Harris, Andrew I., Hensley, Brandon, Hobbs, Richard, Keating, Laura C., Kim, Junhan, Lamb, James W., Lawrence, Charles R., Gahr Sturtzel Lunde, Jonas, Murray, Norman, Pearson, Timothy J., Philip, Liju, Rasmussen, Maren, Readhead, Anthony S., Rennie, Thomas J., Stutzer, Nils-Ole, Uzgil, Bade D., Viero, Marco P., Watts, Duncan J., Wechsler, Risa H., Kathrine Wehus, Ingunn, and Woody, David P. Wed .
"COMAP Early Science. V. Constraints and Forecasts at z ~ 3". United States. https://doi.org/10.3847/1538-4357/ac63c7. https://www.osti.gov/servlets/purl/1882172.
@article{osti_1882172,
title = {COMAP Early Science. V. Constraints and Forecasts at z ~ 3},
author = {Chung, Dongwoo T. and Breysse, Patrick C. and Cleary, Kieran A. and Ihle, Håvard T. and Padmanabhan, Hamsa and Silva, Marta B. and Richard Bond, J. and Borowska, Jowita and Catha, Morgan and Church, Sarah E. and Dunne, Delaney A. and Kristian Eriksen, Hans and Kristine Foss, Marie and Gaier, Todd and Ott Gundersen, Joshua and Harper, Stuart E. and Harris, Andrew I. and Hensley, Brandon and Hobbs, Richard and Keating, Laura C. and Kim, Junhan and Lamb, James W. and Lawrence, Charles R. and Gahr Sturtzel Lunde, Jonas and Murray, Norman and Pearson, Timothy J. and Philip, Liju and Rasmussen, Maren and Readhead, Anthony S. and Rennie, Thomas J. and Stutzer, Nils-Ole and Uzgil, Bade D. and Viero, Marco P. and Watts, Duncan J. and Wechsler, Risa H. and Kathrine Wehus, Ingunn and Woody, David P.},
abstractNote = {We present the current state of models for the z ~ 3 carbon monoxide (CO) line intensity signal targeted by the CO Mapping Array Project (COMAP) Pathfinder in the context of its early science results. Our fiducial model, relating dark matter halo properties to CO luminosities, informs parameter priors with empirical models of the galaxy–halo connection and previous CO (1–0) observations. The Pathfinder early science data spanning wavenumbers k = 0.051–0.62 Mpc–1 represent the first direct 3D constraint on the clustering component of the CO (1–0) power spectrum. Our 95% upper limit on the redshift-space clustering amplitude Aclust ≲ 70 μK2 greatly improves on the indirect upper limit of 420 μK2 reported from the CO Power Spectrum Survey (COPSS) measurement at k ~ 1 Mpc–1. The COMAP limit excludes a subset of models from previous literature and constrains interpretation of the COPSS results, demonstrating the complementary nature of COMAP and interferometric CO surveys. Using line bias expectations from our priors, we also constrain the squared mean line intensity–bias product, ${\left\langle {Tb}\right\rangle }_{2}$ ≲ 50 μK2, and the cosmic molecular gas density, ρH2 < 2.5 × 108 M⊙ Mpc–3 (95% upper limits). Based on early instrument performance and our current CO signal estimates, we forecast that the 5 yr Pathfinder campaign will detect the CO power spectrum with overall signal-to-noise ratio of 9–17. Between then and now, we also expect to detect the CO–galaxy cross-spectrum using overlapping galaxy survey data, enabling enhanced inferences of cosmic star formation and galaxy evolution history.},
doi = {10.3847/1538-4357/ac63c7},
journal = {The Astrophysical Journal},
number = 2,
volume = 933,
place = {United States},
year = {Wed Jul 13 00:00:00 EDT 2022},
month = {Wed Jul 13 00:00:00 EDT 2022}
}
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