Intensity Mapping of Fine Structure Line Emission as a Probe of Large Scale Structure and the Evolving ISM in Dusty, Star-Forming Galaxies at Moderate Redshift

Uzgil, Bade D., Aguirre, J. E., Bradford, C. M.

SPICA Science Conference from Exoplanets to Distant Galaxies: SPICA's New Window on the Cool Universe (June 18-21, 2013. Ito Hall, the University of Tokyo), Bunkyou-ku, Tokyo, Japan

We explore the possibility of studying redshifted far-IR fine-structure transitions through cosmic time using 3- dimensional power spectra obtained with an imaging spectrometer. The intensity mapping approach measures the spatio-spectral fluctuations due to line emission from all galaxies, including those well below the individual detection threshold. With assumptions about large-scale structure, the large-scale fluctuations measure the total volume emissivity in a given transition, with redshift information naturally encoded. We consider as specific examples the possibility of studying redshifted [O I] 63 μm and [Si II] 35 μm with the SAFARI instrument aboard SPICA. While envisioned SAFARI surveys will only detect the brightest galaxies individually, the fluctuation signal from the aggregate population is detected with high significance: cumulative SNR of order 100 for both the total and shot noise power spectra, and order 10 for the clustering power spectrum from surveys sketched in this proceedings article.

形態: カラー図版あり

Physical characteristics: Original contains color illustrations

資料番号: AA1730027030

レポート番号: JAXA-SP-17-010E

Intensity Mapping of Fine Structure Line Emission as a Probe of Large Scale Structure and the Evolving ISM in Dusty, Star-Forming Galaxies at Moderate Redshift

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