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Cosmology with AGN dust time lags–simulating the new VEILS survey

Cosmology with AGN dust time lags–simulating the new VEILS survey
Cosmology with AGN dust time lags–simulating the new VEILS survey
The time lag between optical and near-infrared continuum emission in active galactic nuclei (AGN) shows a tight correlation with luminosity and has been proposed as a standardizable candle for cosmology. In this paper, we explore the use of these AGN hot-dust time lags for cosmological model fitting under the constraints of the new VISTA Extragalactic Infrared Legacy Survey (VEILS). This new survey will target a 9 deg2 field observed in J and Ks band with a 14-d cadence and will run for 3 yr. The same area will be covered simultaneously in the optical griz bands by the Dark Energy Survey, providing complementary time-domain optical data. We perform realistic simulations of the survey setup, showing that we expect to recover dust time lags for about 450 objects out of a total of 1350 optical type 1 AGN, spanning a redshift range of 0.1 < z < 1.2. We use the lags recovered from our simulations to calculate precise distance moduli, establish a Hubble diagram, and fit cosmological models. Assuming realistic scatter in the distribution of the dust around the AGN as well as in the normalization of the lag–luminosity relation, we are able to constrain ΩΛ in ΛCDM with similar accuracy as current supernova samples. We discuss the benefits of combining AGN and supernovae for cosmology and connect the present work to future attempts to reach out to redshifts of z > 4.
0035-8711
1693-1703
Hoenig, S.F.
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Watson, D.
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Kishimoto, M.
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Gandhi, P.
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Goad, M.
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Horne, K.
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Shankar, F.
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Banerji, M.
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Boulderstone, B.
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Jarvis, M.
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Smith, M.
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Sullivan, M.
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Hoenig, S.F.
be0bb8bc-bdac-4442-8edc-f735834f3917
Watson, D.
cd946f1b-19b2-4629-9111-7d3be5798c8b
Kishimoto, M.
fe6c96f7-7782-424c-b715-44f27bfd4f41
Gandhi, P.
5bc3b5af-42b0-4dd8-8f1f-f74048d4d4a9
Goad, M.
62ad798a-4d53-4b93-8e2a-ddd6dcef72a8
Horne, K.
53fcebf2-d0a1-453a-b141-6174ac5e4afe
Shankar, F.
b10c91e4-85cd-4394-a18a-d4f049fd9cdb
Banerji, M.
5a6a7c49-46d6-4187-899f-2ae7e9b1854a
Boulderstone, B.
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Jarvis, M.
ab19a6b5-0be9-4535-a580-cf3566932e26
Smith, M.
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Sullivan, M.
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Hoenig, S.F., Watson, D., Kishimoto, M., Gandhi, P., Goad, M., Horne, K., Shankar, F., Banerji, M., Boulderstone, B., Jarvis, M., Smith, M. and Sullivan, M. (2017) Cosmology with AGN dust time lags–simulating the new VEILS survey. Monthly Notices of the Royal Astronomical Society, 464 (2), 1693-1703. (doi:10.1093/mnras/stw2484).

Record type: Article

Abstract

The time lag between optical and near-infrared continuum emission in active galactic nuclei (AGN) shows a tight correlation with luminosity and has been proposed as a standardizable candle for cosmology. In this paper, we explore the use of these AGN hot-dust time lags for cosmological model fitting under the constraints of the new VISTA Extragalactic Infrared Legacy Survey (VEILS). This new survey will target a 9 deg2 field observed in J and Ks band with a 14-d cadence and will run for 3 yr. The same area will be covered simultaneously in the optical griz bands by the Dark Energy Survey, providing complementary time-domain optical data. We perform realistic simulations of the survey setup, showing that we expect to recover dust time lags for about 450 objects out of a total of 1350 optical type 1 AGN, spanning a redshift range of 0.1 < z < 1.2. We use the lags recovered from our simulations to calculate precise distance moduli, establish a Hubble diagram, and fit cosmological models. Assuming realistic scatter in the distribution of the dust around the AGN as well as in the normalization of the lag–luminosity relation, we are able to constrain ΩΛ in ΛCDM with similar accuracy as current supernova samples. We discuss the benefits of combining AGN and supernovae for cosmology and connect the present work to future attempts to reach out to redshifts of z > 4.

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Accepted/In Press date: 1 October 2016
e-pub ahead of print date: 4 October 2016
Published date: 11 January 2017
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 402390
URI: https://eprints.soton.ac.uk/id/eprint/402390
ISSN: 0035-8711
PURE UUID: 55576647-3f8c-430d-924b-2bb1665be8b0
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615
ORCID for B. Boulderstone: ORCID iD orcid.org/0000-0002-2442-9966
ORCID for M. Smith: ORCID iD orcid.org/0000-0002-3321-1432
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 08 Nov 2016 11:40
Last modified: 15 Jul 2019 19:56

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