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Emission from the circumgalactic medium: from cosmological zoom-in simulations to multiwavelength observables

Augustin, R. and Quiret, S. and Milliard, B. and Péroux, C. and Vibert, D.. and Blaizot, J. and Rasera, Y. and Teyssier, R. and Frank, S and Deharveng, J.-M. and Picouet, V and Martin, D. C. and Hamden, E. T. and Thatte, N. and Pereira Santaella, M. and Routledge, L. and Zieleniewski, S. (2019) Emission from the circumgalactic medium: from cosmological zoom-in simulations to multiwavelength observables. Monthly Notices of the Royal Astronomical Society, 489 (2). pp. 2417-2438. ISSN 0035-8711. doi:10.1093/mnras/stz2238.

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We simulate the flux emitted from galaxy haloes in order to quantify the brightness of the circumgalactic medium (CGM). We use dedicated zoom-in cosmological simulations with the hydrodynamical adaptive mesh refinement code RAMSES, which are evolved down to z = 0 and reach a maximum spatial resolution of 380 h⁻¹ pc and a gas mass resolution up to 1.8×10⁵h⁻¹M⊙ in the densest regions. We compute the expected emission from the gas in the CGM using CLOUDY emissivity models for different lines (e.g. Lyα, C IV, O VI, C VI, O VIII) considering UV background fluorescence, gravitational cooling and continuum emission. In the case of Lyα, we additionally consider the scattering of continuum photons. We compare our predictions to current observations and find them to be in good agreement at any redshift after adjusting the Lyα escape fraction. We combine our mock observations with instrument models for Faint Intergalactic Redshifted Emission Balloon-2 (FIREBall-2; UV balloon spectrograph) and HARMONI (visible and NIR IFU on the ELT) to predict CGM observations with either instrument and optimize target selections and observing strategies. Our results show that Lyα emission from the CGM at a redshift of 0.7 will be observable with FIREBall-2 for bright galaxies (NUV∼18 mag), while metal lines like O VI and C IV will remain challenging to detect. HARMONI is found to be well suited to study the CGM at different redshifts with various tracers.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Péroux, C.0000-0002-4288-599X
Martin, D. C.0000-0002-8650-1644
Pereira Santaella, M.0000-0002-4005-9619
Additional Information:© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2019 August 8. Received 2019 August 8; in original form 2018 November 14. Published: 12 August 2019. RA thanks CNRS and CNES (Centre National d’Etudes Spatiales) as well as ESO for support for her PhD. CP is grateful to the ESO science visitor programme and the DFG cluster of excellence ‘Origin and Structure of the Universe’ for support. CP thanks the Alexander von Humboldt Foundation for the granting of a Bessel Research Award held at MPA. NT, LR, MPS, and SZ acknowledge support from the Science and Technology Facilities Council (grants ST/N002717/1 and ST/M007650/1), as part of the UK E-ELT Programme at the University of Oxford. The simulations in this work are part of the BINGO! project. This work was granted access to the HPC resources of CINES under the allocation 2015-042287 made by GENCI. Images created with GLNemo2 (, a 3D visualization program for nbody data, developed by Jean-Charles Lambert at CeSAM-LAM. We thank J.-C. Lambert for GLNemo2-related discussions. We thank ESO for the publicly available Exposure Time Calculators for MUSE and SINFONI. RA thanks Jérémy Fensch and Nicolas Guillard for useful discussions.
Funding AgencyGrant Number
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Centre National d’Études Spatiales (CNES)UNSPECIFIED
European Southern Observatory (ESO)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Alexander von Humboldt FoundationUNSPECIFIED
Science and Technology Facilities Council (STFC)ST/N002717/1
Science and Technology Facilities Council (STFC)ST/M007650/1
Subject Keywords:galaxies: evolution – galaxies: formation – intergalactic medium
Issue or Number:2
Record Number:CaltechAUTHORS:20191025-135004556
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Official Citation:R Augustin, S Quiret, B Milliard, C Péroux, D Vibert, J Blaizot, Y Rasera, R Teyssier, S Frank, J-M Deharveng, V Picouet, D C Martin, E T Hamden, N Thatte, M Pereira Santaella, L Routledge, S Zieleniewski, Emission from the circumgalactic medium: from cosmological zoom-in simulations to multiwavelength observables, Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 2, October 2019, Pages 2417–2438,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99464
Deposited By: Tony Diaz
Deposited On:25 Oct 2019 21:22
Last Modified:16 Nov 2021 17:46

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