Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origins Space Telescope: predictions for far-IR spectroscopic surveys   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 $\sim 1.9 \times 10^{6}$ to $\sim 8.7 \times 10^{6}$ lines from
$\sim 4.8 \times 10^{5}$-$2.7 \times 10^{6}$ star-forming galaxies and from
$\sim 1.4 \times 10^{4}$ to $\sim 3.8 \times 10^{4}$ lines from $\sim 1.3
\times 10^{4}$-$3.5 \times 10^{4}$ 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.

17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio