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CONCERTO : Extracting the power spectrum of the [CII] emission line
- Van Cuyck, M. (författare)
- Ponthieu, N. (författare)
- Lagache, G. (författare)
- visa fler...
- Beelen, A. (författare)
- Béthermin, M. (författare)
- Gkogkou, A. (författare)
- Aravena, M. (författare)
- Benoit, A. (författare)
- Bounmy, J. (författare)
- Calvo, M. (författare)
- Catalano, A. (författare)
- Désert, F. X. (författare)
- Dupé, F. -X. (författare)
- Fasano, A. (författare)
- Ferrara, A. (författare)
- Goupy, J. (författare)
- Hoarau, C. (författare)
- Hu, W. (författare)
- Lambert, J. - C. (författare)
- Macías-Pérez, J. F. (författare)
- Marpaud, J. (författare)
- Monfardini, A. (författare)
- Pallottini, A. (författare)
- visa färre...
- (creator_code:org_t)
- 2023
- 2023
- Engelska.
- Ingår i: Astronomy and Astrophysics. - 0004-6361 .- 1432-0746. ; 676
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
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- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies
- star formation
- high-redshift
- ISM
- large-scale structure of Universe
- cosmology
- observations
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- Van Cuyck, M.
- Ponthieu, N.
- Lagache, G.
- Beelen, A.
- Béthermin, M.
- Gkogkou, A.
- visa fler...
- 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.
- visa färre...
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