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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/8677
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dc.contributor.authorDutta, Alankar-
dc.contributor.authorBisht, Mukesh Singh-
dc.contributor.authorSharma, Prateek-
dc.contributor.authorGhosh, Ritali-
dc.contributor.authorRoy, Manami-
dc.contributor.authorNath, Biman B-
dc.date.accessioned2026-02-27T11:19:47Z-
dc.date.available2026-02-27T11:19:47Z-
dc.date.issued2024-04-27-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2024, Vol. 531 (4), p 5117-5139en_US
dc.identifier.issn1365-2966-
dc.identifier.urihttp://hdl.handle.net/2289/8677-
dc.descriptionOpen Access. Also available at arXiv.org (one of the alternative locations)en_US
dc.description.abstractRecent observations and simulations reveal that the circumgalactic medium (CGM) surrounding galaxies is multiphase, with the gas temperatures spanning a wide range at most radii, ∼104 K to the virial temperature (∼106 K for Milky Way). Traditional CGM models using simple density profiles are inadequate at reproducing observations that indicate a broad temperature range. Alternatively, a model based on probability distribution functions (PDFs) with parameters motivated by simulations can better match multiwavelength observations. In this work, we use log-normal distributions, commonly seen in the simulations of the multiphase interstellar and circumgalactic media, to model the multiphase CGM. We generalize the isothermal background model by Faerman et al. to include more general CGM profiles. We extend the existing probabilistic models from 1D-PDFs in temperature to 2D-PDFs in density–temperature phase space and constrain its parameters using a Milky Way-like Illustris TNG50-1 halo. We generate various synthetic observables such as column densities of different ions, UV/X-ray spectra, and dispersion and emission measures. X-ray and radio (Fast Radio Burst) observations mainly constrain the hot gas properties. However, interpreting cold/warm phase diagnostics is not straightforward since these phases are patchy, with inherent variability in intercepting these clouds along arbitrary lines of sight. We provide a tabulated comparison of model predictions with observations and plan to expand this into a comprehensive compilation of models and data. Our modelling provides a simple analytical framework that is useful for describing important aspects of the multiphase CGM.en_US
dc.language.isoenen_US
dc.publisherMonthly Notices of the Royal Astronomical Societyen_US
dc.relation.urihttps://doi.org/10.48550/arXiv.2310.03717en_US
dc.relation.urihttps://doi.org/10.1093/mnras/stae977en_US
dc.rights2024 Authorsen_US
dc.subjectmethods: analyticalen_US
dc.subjectmethods: data analysisen_US
dc.subjectGalaxy: halo, galaxies: haloesen_US
dc.subjectquasars: absorption linesen_US
dc.subjectsoftware: developmenten_US
dc.titleBeyond radial profiles: using log-normal distributions to model the multiphase circumgalactic mediumen_US
dc.typeArticleen_US
dc.additionalCollection: RAS Journalsen_US
Appears in Collections:Research Papers (A&A)

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