Hot Gas Outflow Properties of the Starburst Galaxy NGC 4945
| dc.contributor.author | Barrera, Natalia Porraz | |
| dc.contributor.author | Lopez, Sebastian | |
| dc.contributor.author | Lopez, Laura A. | |
| dc.contributor.author | Foord, Adi | |
| dc.contributor.author | Nguyen, Dustin D. | |
| dc.contributor.author | Thompson, Todd A. | |
| dc.contributor.author | Bolatto, Alberto D. | |
| dc.date.accessioned | 2024-01-12T13:17:11Z | |
| dc.date.available | 2024-01-12T13:17:11Z | |
| dc.date.issued | 2023-12-13 | |
| dc.description.abstract | 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 2.1M⊙ 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. | |
| dc.description.sponsorship | NPB, SL, and LAL were supported by NASA’s Astrophysics Data Analysis Program under grant number 80NSSC22K0496 and by the Heising-Simons Foundation through grant number 2022-3533. LAL also acknowledges the support of the Simons Foundation. We thank the OSU Galaxy/ISM Meeting for useful discussions. DDN acknowledges funding from NASA 21-ASTRO21- 0174. | |
| dc.description.uri | https://arxiv.org/abs/2312.08444 | |
| dc.format.extent | 10 pages | |
| dc.genre | journal articles | |
| dc.genre | preprints | |
| dc.identifier.uri | https://doi.org/10.48550/arXiv.2312.08444 | |
| dc.identifier.uri | http://hdl.handle.net/11603/31290 | |
| dc.language.iso | en_US | |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Physics Department Collection | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.title | Hot Gas Outflow Properties of the Starburst Galaxy NGC 4945 | |
| dc.type | Text | |
| dcterms.creator | https://orcid.org/0000-0002-1616-1701 |