Search: onr:"swepub:oai:DiVA.org:su-221072" >
CONCERTO :
CONCERTO : Extracting the power spectrum of the [CII] emission line
-
Van Cuyck, M. (author)
-
Ponthieu, N. (author)
-
Lagache, G. (author)
-
show more...
-
Beelen, A. (author)
-
Béthermin, M. (author)
-
Gkogkou, A. (author)
-
Aravena, M. (author)
-
Benoit, A. (author)
-
Bounmy, J. (author)
-
Calvo, M. (author)
-
Catalano, A. (author)
-
Désert, F. X. (author)
-
Dupé, F. -X. (author)
-
Fasano, A. (author)
-
Ferrara, A. (author)
-
Goupy, J. (author)
-
Hoarau, C. (author)
-
Hu, W. (author)
-
Lambert, J. - C. (author)
-
Macías-Pérez, J. F. (author)
-
Marpaud, J. (author)
-
- Mellema, Garrelt (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
Monfardini, A. (author)
-
Pallottini, A. (author)
-
show less...
-
(creator_code:org_t)
- 2023
- 2023
- English.
-
In: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 676
- Related links:
-
https://doi.org/10.1...
-
show more...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- Context. CONCERTO is the first experiment to perform a [CII] line intensity mapping (LIM) survey on the COSMOS field to target z > 5.2. Measuring the [CII] angular power spectrum allows us to study the role of dusty star-forming galaxies in the star formation history during the epochs of Reionization and post-Reionization. The main obstacle to this measurement is the contamination by bright foregrounds: the dust continuum emission and atomic and molecular lines from foreground galaxies at z ≲ 3.Aims. We evaluate our ability to retrieve the [CII] signal in mock observations of the sky using the Simulated Infrared Dusty Extragalactic Sky (SIDES), which covers the mid-infrared to millimetre range. We also measure the impact of field-to-field variance on the residual foreground contamination.Methods. We compared two methods for dealing with the dust continuum emission from galaxies (i.e. the cosmic infrared background fluctuations): the standard principal component analysis (PCA) and the asymmetric re-weighted penalized least-squares (arPLS) method. For line interlopers, the strategy relies on masking low-redshift galaxies using the instrumental beam profile and external catalogues. As we do not have observations of CO or deep-enough classical CO proxies (such as LIR), we relied on the COSMOS stellar mass catalogue, which we demonstrate to be a reliable CO proxy for masking. To measure the angular power spectrum of masked data, we adapted the P of K EstimatoR (POKER) from cosmic infrared background studies and discuss its use on LIM data.Results. The arPLS method achieves a reduction in the cosmic infrared background fluctuations to a sub-dominant level of the [CII] power at z ∼ 7, a factor of > 70 below our fiducial [CII] model. When using the standard PCA, this factor is only 0.7 at this redshift. The masking lowers the power amplitude of line contamination down to 2 × 10−2 Jy2 sr−1. This residual level is dominated by faint undetected sources that are not clustered around the detected (and masked) sources. For our [CII] model, this results in a detection at z = 5.2 with a power ratio [CII]/(residual interlopers) = 62 ± 32 for a 22% area survey loss. However, at z = 7, [CII]/(residual interlopers) = 2.0 ± 1.4, due to the weak contrast between [CII] and the residual line contamination. Thanks to the large area covered by SIDES-Uchuu, we show that the power amplitude of line residuals varies by 12–15% for z = 5.2 − 7, which is less than the field-to-field variance affecting [CII] power spectra.Conclusions. We present an end-to-end simulation of the extragalactic foreground removal that we ran to detect the [CII] at high redshift via its angular power spectrum. We show that cosmic infrared background fluctuations are not a limiting foreground for [CII] LIM. On the contrary, the CO and [CI] line contamination severely limits our ability to accurately measure the [CII] angular power spectrum at z ≳ 7.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies
- star formation
- high-redshift
- ISM
- large-scale structure of Universe
- cosmology
- observations
Publication and Content Type
- ref (subject category)
- art (subject category)
Find in a library
To the university's database
- By the author/editor
-
Van Cuyck, M.
-
Ponthieu, N.
-
Lagache, G.
-
Beelen, A.
-
Béthermin, M.
-
Gkogkou, A.
-
show more...
-
Aravena, M.
-
Benoit, A.
-
Bounmy, J.
-
Calvo, M.
-
Catalano, A.
-
Désert, F. X.
-
Dupé, F. -X.
-
Fasano, A.
-
Ferrara, A.
-
Goupy, J.
-
Hoarau, C.
-
Hu, W.
-
Lambert, J. - C.
-
Macías-Pérez, J. ...
-
Marpaud, J.
-
Mellema, Garrelt
-
Monfardini, A.
-
Pallottini, A.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Astronomy and As ...
- By the university
-
Stockholm University