Jana, R and Gupta, S and Nath, BB (2020) Role of cosmic rays in the early stages of galactic outflows. In: Monthly Notices of the Royal Astronomical Society, 497 (3). pp. 2623-2640.
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Abstract
Using an idealized set-up, we investigate the dynamical role of cosmic rays (CRs) in the early stages of galactic outflows for galaxies of halo masses 108, 1011, and 1012 M⊙. The outflow is launched from a central region in the galactic disc where we consider three different constant star formation rates (0.1, 1, and 10 M⊙ yr-1) over a dynamical time-scale of 50 Myr. We determine the temperature distribution of the gas and find that CRs can reduce the temperature of the shocked gas, which is consistent with previous results. However, we show that CRs do not have any noticeable effect on the mass loading by the outflow. We find that CRs can reduce the size of the outflow, which contradicts previous claims of efficient dynamical impact of CRs; however, it is consistent with earlier theoretical models of CR-driven blastwave as well as stellar wind. We discuss the dependence of our results on CR injection prescriptions and compare them with earlier studies. We conclude that in the early stages of galactic outflows the dynamical role of CRs is not important. © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
| Item Type: | Journal Article |
|---|---|
| Publication: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Oxford University Press |
| Additional Information: | The copyright for this article belongs to The Author(s). |
| Keywords: | Cosmic rays; Galaxies; Stars, Galactic disks; Galaxies: star formation; Galaxies: starbursts; Galaxy evolution; Halo mass; ISM: cosmic rays; Mass loadings; Star formation rates; Stars: winds outflows; Time-scales, Cosmology |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 13 Jan 2023 05:20 |
| Last Modified: | 13 Jan 2023 05:20 |
| URI: | https://eprints.iisc.ac.in/id/eprint/79084 |
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