Skip to Main content Skip to Navigation
Journal articles

The ALMA Spectroscopic Survey in the HUDF: Constraining Cumulative CO Emission at 1 ≲ z ≲ 4 with Power Spectrum Analysis of ASPECS LP Data from 84 to 115 GHz

Abstract : We present a power spectrum analysis of the ALMA Spectroscopic Survey Large Program (ASPECS LP) data from 84 to 115 GHz. These data predominantly probe small-scale fluctuations (k = 10-100 h Mpc-1) in the aggregate CO emission in galaxies at 1≲ z ≲ 4. We place an integral constraint on CO luminosity functions (LFs) in this redshift range via a direct measurement of their second moments in the three-dimensional (3D) autopower spectrum, finding a total CO shot-noise power {P}CO,{CO}}({k}CO(2-1)})≤slant 1.9× {10}2 μK2 (Mpc h -1)3. This upper limit (3σ) is consistent with the observed ASPECS CO LFs in Decarli et al. but rules out a large space in the range of {P}CO,{CO}}({k}CO(2-1)}) inferred from these LFs, which we attribute primarily to large uncertainties in the normalization Φ* and knee L * of the Schechter-form CO LFs at z > 2. Also, through power spectrum analyses of ASPECS LP data with 415 positions from galaxies with available optical spectroscopic redshifts, we find that contributions to the observed mean CO intensity and shot-noise power of MUSE galaxies are largely accounted for by ASPECS blind detections. Finally, we sum the fluxes from individual blind CO detections to yield a lower limit on the mean CO surface brightness at 99 GHz of < {T}CO}> =0.55+/- 0.02 μK, which we estimate represents 68%-80% of the total CO surface brightness at this frequency.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03711408
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Friday, July 1, 2022 - 1:35:39 PM
Last modification on : Saturday, July 2, 2022 - 3:40:14 AM

Links full text

Identifiers

Collections

Citation

Bade D. Uzgil, Chris Carilli, Adam Lidz, Fabian Walter, Nithyanandan Thyagarajan, et al.. The ALMA Spectroscopic Survey in the HUDF: Constraining Cumulative CO Emission at 1 ≲ z ≲ 4 with Power Spectrum Analysis of ASPECS LP Data from 84 to 115 GHz. The Astrophysical Journal, 2019, 887, ⟨10.3847/1538-4357/ab517f⟩. ⟨insu-03711408⟩

Share

Metrics

Record views

0