Spatial-Kinematic Absorption Models of the Circumgalactic Medium. II. Ionized Gas Phases and Absorption Lines
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arXiv
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866917047665950720 |
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| author | Churchill, Christopher W. |
| author_facet | Churchill, Christopher W. |
| contents | In this two-paper series, we present a straightforward mathematical model for synthesizing quasar absorption line profiles from sight lines through idealized, spatial-kinematic models of the circumgalactic medium (CGM) and their host galaxies. In Paper I, we developed the spatial components of the galaxy/CGM structures (disk, halo, wind, accretion) and their 3D velocity fields. We derived the formalism for arbitrary observed orientation of the galaxy/CGM model and quasar line of sight positioning. In this paper, following a brief review of Paper I, we present the formalism for populating the galaxy/CGM structures with multiphase photoionized and collisionally ionized gas and for generating HI and metal-line absorption profiles. Example absorption line systems through a fiducial galaxy/CGM model are presented. These flexible spatial-kinematic absorption models (SKAMs) can be directly applied to and/or easily modified/expanded for studying individual or ensembles of observed absorption line systems, for exploring various competing theoretical scenarios of the baryon cycle as studied through quasar absorption line systems, and/or serving as pedagogical tools for developing physical intuition. We briefly describe a SKAM GUI that is in early stages of development. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_23803 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spatial-Kinematic Absorption Models of the Circumgalactic Medium. II. Ionized Gas Phases and Absorption Lines Churchill, Christopher W. Astrophysics of Galaxies In this two-paper series, we present a straightforward mathematical model for synthesizing quasar absorption line profiles from sight lines through idealized, spatial-kinematic models of the circumgalactic medium (CGM) and their host galaxies. In Paper I, we developed the spatial components of the galaxy/CGM structures (disk, halo, wind, accretion) and their 3D velocity fields. We derived the formalism for arbitrary observed orientation of the galaxy/CGM model and quasar line of sight positioning. In this paper, following a brief review of Paper I, we present the formalism for populating the galaxy/CGM structures with multiphase photoionized and collisionally ionized gas and for generating HI and metal-line absorption profiles. Example absorption line systems through a fiducial galaxy/CGM model are presented. These flexible spatial-kinematic absorption models (SKAMs) can be directly applied to and/or easily modified/expanded for studying individual or ensembles of observed absorption line systems, for exploring various competing theoretical scenarios of the baryon cycle as studied through quasar absorption line systems, and/or serving as pedagogical tools for developing physical intuition. We briefly describe a SKAM GUI that is in early stages of development. |
| title | Spatial-Kinematic Absorption Models of the Circumgalactic Medium. II. Ionized Gas Phases and Absorption Lines |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.23803 |