Hot Gas Outflow Properties of the Starburst Galaxy NGC 4945
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| author | Barrera, Natalia Porraz Lopez, Sebastian Lopez, Laura A. Foord, Adi Nguyen, Dustin D. Thompson, Todd A. Mathur, Smita Bolatto, Alberto D. |
| author_facet | Barrera, Natalia Porraz Lopez, Sebastian Lopez, Laura A. Foord, Adi Nguyen, Dustin D. Thompson, Todd A. Mathur, Smita Bolatto, Alberto D. |
| contents | We analyze 330 ks of {\it Chandra} X-ray imaging and spectra of the nearby, edge-on starburst and Seyfert Type 2 galaxy NGC 4945 to measure the hot gas properties along the galactic outflows. We extract and model spectra from 15 regions extending from $-$0.55 kpc to $+$0.85 kpc above and below the galactic disk to determine the best-fit parameters and metal abundances. We find that the hot gas temperatures and number densities peak in the central regions and decrease along the outflows. These profiles are inconsistent with a spherical, adiabatically-expanding wind model, suggesting the need to include mass loading and/or a non-spherical outflow geometry. We estimate the mass outflow rate of the hot wind to be $1.6\:M_{\odot}~\rm{yr}^{-1}$. Emission from charge exchange is detected in the northern outflow, and we estimate it contributes 12\% to the emitted, broad-band ($0.5-7$ keV) X-ray flux. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_08444 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Hot Gas Outflow Properties of the Starburst Galaxy NGC 4945 Barrera, Natalia Porraz Lopez, Sebastian Lopez, Laura A. Foord, Adi Nguyen, Dustin D. Thompson, Todd A. Mathur, Smita Bolatto, Alberto D. High Energy Astrophysical Phenomena Astrophysics of Galaxies We analyze 330 ks of {\it Chandra} X-ray imaging and spectra of the nearby, edge-on starburst and Seyfert Type 2 galaxy NGC 4945 to measure the hot gas properties along the galactic outflows. We extract and model spectra from 15 regions extending from $-$0.55 kpc to $+$0.85 kpc above and below the galactic disk to determine the best-fit parameters and metal abundances. We find that the hot gas temperatures and number densities peak in the central regions and decrease along the outflows. These profiles are inconsistent with a spherical, adiabatically-expanding wind model, suggesting the need to include mass loading and/or a non-spherical outflow geometry. We estimate the mass outflow rate of the hot wind to be $1.6\:M_{\odot}~\rm{yr}^{-1}$. Emission from charge exchange is detected in the northern outflow, and we estimate it contributes 12\% to the emitted, broad-band ($0.5-7$ keV) X-ray flux. |
| title | Hot Gas Outflow Properties of the Starburst Galaxy NGC 4945 |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2312.08444 |