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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
; | | Date: |
3 Mar 2019 | | 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 $sim 1.9 imes 10^{6}$ to $sim 8.7 imes 10^{6}$ lines from
$sim 4.8 imes 10^{5}$-$2.7 imes 10^{6}$ star-forming galaxies and from
$sim 1.4 imes 10^{4}$ to $sim 3.8 imes 10^{4}$ lines from $sim 1.3
imes 10^{4}$-$3.5 imes 10^{4}$ 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. | | Source: | arXiv, 1903.0946 | | Services: | Forum | Review | PDF | Favorites | |
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