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Origins Space Telescope: Predictions for far-IR spectroscopic surveys
Bonato, Matteo; De Zotti, Gianfranco; Leisawitz, David; Negrello, Mattia; Massardi, Marcella; Baronchelli, Ivano; Cai, Zhen-Yi; Bradford, Charles M.; Pope, Alexandra; Murphy, Eric J.; Armus, Lee; Cooray, Asantha
AA(INAF - Istituto di Radioastronomia, and Italian ALMA Regional Centre, Via Gobetti 101, I-40129, Bologna, Italy 0000-0001-9139-2342), AB(INAF, Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, I-35122 Padova, Italy), AC(NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt MD, USA), AD(School of Physics and Astronomy, Cardiff University, The Parade, Cardiff CF24 3AA, UK), AE(INAF - Istituto di Radioastronomia, and Italian ALMA Regional Centre, Via Gobetti 101, I-40129, Bologna, Italy), AF(California Institute of Technology, Pasadena, CA), AG(CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, China), AH(California Institute of Technology, Pasadena, CA), AI(Department of Astronomy, University of Massachusetts Amherst, Amherst, MA), AJ(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA), AK(California Institute of Technology, Pasadena, CA)
Publications of the Astronomical Society of Australia, Volume 36, id. e017 (PASA Homepage)
Publication Date:
Astronomy Keywords:
galaxies: active, galaxies: evolution, galaxies: luminosity function, galaxies: starburst, infrared: galaxies
Abstract Copyright:
2019: Astronomical Society of Australia
Bibliographic Code:


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 deg2 and a deep survey of 1 deg2) 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 1 000 h, surveys with the reference concept will detect from ˜1.9×106 to ˜8.7×106 lines from ˜4.8×105 to 2.7×106 star-forming galaxies and from ˜1.4×104 to ˜3.8×104 lines from ˜1.3×104 to 3.5×104 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 >= 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 ˜ 8.5, i.e. all the way through the reionisation epoch. The proposed surveys will allow us to explore the galaxy-AGN co-evolution up to z ˜ 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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