Origins Space Telescope: predictions for far-IR spectroscopic surveys

Matteo Bonato; Gianfranco De Zotti; David Leisawitz; Mattia Negrello; Marcella Massardi; Ivano Baronchelli; Zhen-Yi Cai; Charles M. Bradford; Alexandra Pope; Eric J. Murphy; Lee Armus; Asantha Cooray

doi:10.1017/pasa.2019.8

paper

Origins Space Telescope: predictions for far-IR spectroscopic surveys

arXiv:1903.00946 · doi:10.1017/pasa.2019.8

Abstract

We illustrate the extraordinary potential of the (far-IR) Origins Survey Spectrometer (OSS) on board the Origins Space Telescope (OST) to address a variety of open issues on the co-evolution of galaxies and AGNs. We present predictions for blind surveys, each of 1000 h, with different mapped areas (a shallow survey covering an area of 10 deg $^{2}$ and a deep survey of 1 deg $^{2}$ ) and two different concepts of the OST/OSS: with a 5.9 m telescope (Concept 2, our reference configuration) and with a 9.1 m telescope (Concept 1, previous configuration). In 1000 h, surveys with the reference concept will detect from $\sim 1.9 \times 1 0^{6}$ to $\sim 8.7 \times 1 0^{6}$ lines from $\sim 4.8 \times 1 0^{5}$ - $2.7 \times 1 0^{6}$ star-forming galaxies and from $\sim 1.4 \times 1 0^{4}$ to $\sim 3.8 \times 1 0^{4}$ lines from $\sim 1.3 \times 1 0^{4}$ - $3.5 \times 1 0^{4}$ AGNs. The shallow survey will detect substantially more sources than the deep one; the advantage of the latter in pushing detections to lower luminosities/higher redshifts turns out to be quite limited. The OST/OSS will reach, in the same observing time, line fluxes more than one order of magnitude fainter than the SPICA/SMI and will cover a much broader redshift range. In particular it will detect tens of thousands of galaxies at $z \geq 5$ , beyond the reach of that instrument. The polycyclic aromatic hydrocarbons lines are potentially bright enough to allow the detection of hundreds of thousands of star-forming galaxies up to $z \sim 8.5$ , i.e. all the way through the re-ionization epoch. The proposed surveys will allow us to explore the galaxy-AGN co-evolution up to $z \sim 5.5 - 6$ with very good statistics. OST Concept 1 does not offer significant advantages for the scientific goals presented here.

24 pages, 20 figures, 2 tables, accepted for publication in PASA

Origins Space Telescope: predictions for far-IR spectroscopic surveys

Abstract

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