The 4MOST–Gaia Purely Astrometric Quasar Survey (4G-PAQS)
The 4MOST–Gaia Purely Astrometric Quasar Survey (4G-PAQS)
The 4MOST–Gaia Purely Astrometric Quasar Survey (4G-PAQS) will carry out the first large-scale, colour-independent quasar survey selected solely on the basis of astrometry from Gaia. Our main objective is to quantify the selection effects of current colour-selected samples. These colour-selected samples bias our view of the neutral gas and its chemical enrichment because of dust obscuration and reddening of optical colours. Moreover, the broad absorption-line outflows observed in quasars are under-represented by optical colour selection. 4G-PAQS will provide the first sample to overcome these challenges and will constrain the physical and chemical properties of gas in galaxies and quasars at cosmic noon.
38-41
Krogager, Jens-Kristian
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Leighly, Karen M.
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Fynbo, Johan Peter Uldall
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Heintz, Kasper Elm
157e3e81-2ba2-479e-83b4-b6fe95eeeb18
Balashev, Sergi
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Christensen, Lise Bech
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Milvang-Jensen, Bo
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Møller, Palle
d6f2ce35-8508-441f-b8c3-aff0a478f15e
Raimundo, Sandra
e409d9d3-17e8-4049-ad29-43ada60b24e2
Vestergaard, Marianne
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1 March 2023
Krogager, Jens-Kristian
a3999346-eea6-4ecf-b8e3-40b14e52ddcc
Leighly, Karen M.
6c62a6e6-6274-46a7-ab6e-a78e33470cbf
Fynbo, Johan Peter Uldall
bc453d34-ca1d-47b4-a25a-2edb4772b12a
Heintz, Kasper Elm
157e3e81-2ba2-479e-83b4-b6fe95eeeb18
Balashev, Sergi
9b24fe03-90ec-49e3-8bbf-2c021ed57dbf
Christensen, Lise Bech
79ae460b-0506-4978-b8fe-9cdad1262107
Milvang-Jensen, Bo
b15cb308-fc0c-4351-a43f-6b1c0a124b7c
Møller, Palle
d6f2ce35-8508-441f-b8c3-aff0a478f15e
Raimundo, Sandra
e409d9d3-17e8-4049-ad29-43ada60b24e2
Vestergaard, Marianne
3d2377bc-0c0a-4198-9439-e7e9ac344b4e
Krogager, Jens-Kristian, Leighly, Karen M. and Fynbo, Johan Peter Uldall
,
et al.
(2023)
The 4MOST–Gaia Purely Astrometric Quasar Survey (4G-PAQS).
The Messenger, 190, .
(doi:10.18727/0722-6691/5310).
Abstract
The 4MOST–Gaia Purely Astrometric Quasar Survey (4G-PAQS) will carry out the first large-scale, colour-independent quasar survey selected solely on the basis of astrometry from Gaia. Our main objective is to quantify the selection effects of current colour-selected samples. These colour-selected samples bias our view of the neutral gas and its chemical enrichment because of dust obscuration and reddening of optical colours. Moreover, the broad absorption-line outflows observed in quasars are under-represented by optical colour selection. 4G-PAQS will provide the first sample to overcome these challenges and will constrain the physical and chemical properties of gas in galaxies and quasars at cosmic noon.
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More information
Published date: 1 March 2023
Identifiers
Local EPrints ID: 505344
URI: http://eprints.soton.ac.uk/id/eprint/505344
PURE UUID: 07638763-146a-48f5-a82b-bd1774e6fd97
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Date deposited: 07 Oct 2025 16:38
Last modified: 08 Oct 2025 02:01
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Contributors
Author:
Jens-Kristian Krogager
Author:
Karen M. Leighly
Author:
Johan Peter Uldall Fynbo
Author:
Kasper Elm Heintz
Author:
Sergi Balashev
Author:
Lise Bech Christensen
Author:
Bo Milvang-Jensen
Author:
Palle Møller
Author:
Marianne Vestergaard
Corporate Author: et al.
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