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

Uzgil B.D.; Carilli C.; Lidz A.; Walter F.; Thyagarajan N.; Decarli R.; Aravena M.; Bertoldi F.; Cortes, P. C.; González-López J.; Inami H.; Popping G.; Riechers D.A.; Werf P.V.D.; Wagg J.; et. al.

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 less than or similar to z less than or similar to 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,P- (CO)(k(CO(2-1))) <= 1.9 x 10(2) mu K-2 (Mpc h(-1))(3). This upper limit (3 sigma) is consistent with the observed ASPECS CO LFs in Decarli et al. but rules out a large space in the range of P-CO,P-CO(k(CO(2-1))) inferred from these LFs, which we attribute primarily to large uncertainties in the normalization Phi(*) 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 mu K, which we estimate represents 68%-80% of the total CO surface brightness at this frequency.

Más información

Título según WOS: The ALMA Spectroscopic Survey in the HUDF: Constraining Cumulative CO Emission at 1 less than or similar to z less than or similar to 4 with Power Spectrum Analysis of ASPECS LP Data from 84 to 115 GHz
Título según SCOPUS: 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
Título de la Revista: ASTROPHYSICAL JOURNAL
Volumen: 887
Número: 1
Editorial: IOP PUBLISHING LTD
Fecha de publicación: 2019
Idioma: English
DOI:

10.3847/1538-4357/ab517f

Notas: ISI, SCOPUS