Origins Space Telescope: predictions for far-IR spectroscopic surveys. (arXiv:1903.00946v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Bonato_M/0/1/0/all/0/1">Matteo Bonato</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zotti_G/0/1/0/all/0/1">Gianfranco De Zotti</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Leisawitz_D/0/1/0/all/0/1">David Leisawitz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Negrello_M/0/1/0/all/0/1">Mattia Negrello</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Massardi_M/0/1/0/all/0/1">Marcella Massardi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Baronchelli_I/0/1/0/all/0/1">Ivano Baronchelli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cai_Z/0/1/0/all/0/1">Zhen-Yi Cai</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bradford_C/0/1/0/all/0/1">Charles M. Bradford</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pope_A/0/1/0/all/0/1">Alexandra Pope</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Murphy_E/0/1/0/all/0/1">Eric J. Murphy</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Armus_L/0/1/0/all/0/1">Lee Armus</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cooray_A/0/1/0/all/0/1">Asantha Cooray</a>
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 $zsim 5.5-6$ with very
good statistics. OST Concept 1 does not offer significant advantages for the
scientific goals presented here.
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 $zsim 5.5-6$ with very
good statistics. OST Concept 1 does not offer significant advantages for the
scientific goals presented here.
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