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http://hdl.handle.net/2289/6905| Title: | Extraplanar X-ray emission from disc-wide out ows in spiral galaxies. |
| Authors: | Vijayan, Aditi Sarkar, Kartick Chandra Nath, Biman B. Sharma, Prateek Shchekinov, Yuri |
| Keywords: | Galaxies Starburst X-rays |
| Issue Date: | Apr-2018 |
| Publisher: | Oxford University Press for the Royal Astronomical Society |
| Citation: | Monthly Notices of the Royal Astronomical Society, 2018, Vol. 475, p5513-5528 |
| Abstract: | We study the effects of mass and energy injection due to OB associations spread across the rotating disc of a Milky Way-type galaxy, with the help of three-dimensional (3D) hydrodynamic simulations. We compare the resulting X-ray emission with that produced from the injection of mass and energy from a central region. We find that the predicted X-ray image shows a filamentary structure that arises even in the absence of disc gas inhomogeneity. This structure stems from warm clumps made of disc material being lifted by the injected gas. We show that as much as half of the total X-ray emission comes from regions surrounding warm clumps that are made of a mix of disc and injected gas. This scenario has the potential to explain the origin of the observed extraplanar X-ray emission around star-forming galaxies and can be used to understand the observed sub-linear relation between the LX, the total X-ray luminosity, and star formation rate (SFR). We quantify the mass contained in these ‘bow-shock’ regions. We also show that the top-most region of the outer shock above the central area emits harder X-rays than the rest. Further, we find that the mass distribution in different temperature ranges is bimodal, peaking at 104–105 K (in warm clumps) and 106–107 K (X-ray emitting gas). The mass-loading factor is found to decrease with increasing SFR, consistent with previous theoretical estimates and simulations. |
| Description: | Open Access |
| URI: | http://hdl.handle.net/2289/6905 |
| ISSN: | 0035-8711 1365-2966 (Online) |
| Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?arXiv:1712.06252 https://arxiv.org/abs/1712.06252 http://dx.doi.org/10.1093/mnras/sty198 |
| Copyright: | 2018 The authors & the Royal Astronomical Society |
| Appears in Collections: | Research Papers (A&A) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2018_MNRAS_475_5513.pdf | Open Access | 6.79 MB | Adobe PDF | View/Open |
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