Hot Gas Outflow Properties of the Starburst Galaxy NGC 4945
arXiv:2312.08444 · doi:10.3847/1538-4357/ad4606
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 . Emission from charge exchange is detected in the northern outflow, and we estimate it contributes 12\% to the emitted, broad-band ( keV) X-ray flux.
arXiv comment11 pages, 7 figures; submitted (13 December 2023), accepted ApJ (11 April 2023)
References in corpus (38)
- Astropy: A Community Python Package for Astronomy
- The chemical composition of the Sun
- The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- On the Absorption of X-rays in the Interstellar Medium
- The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
- Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
- HI4PI: A full-sky HI survey based on EBHIS and GASS
- Galactic Winds
- The Circumgalactic Medium
- An XMM-Newton survey of broad iron lines in Seyfert galaxies
- Cosmicflows-3
- Cool Outflows in Galaxies and their Implications
- A high spatial resolution X-ray and H-alpha study of hot gas in the halos of star-forming disk galaxies. I. Spatial and spectral properties of the diffuse X-ray emission
- A high spatial resolution X-ray and H-alpha study of hot gas in the halos of star-forming disk galaxies. II. Quantifying supernova feedback
- The MAGNUM survey: different gas properties in the outflowing and disk components in nearby active galaxies with MUSE
- Metal-enriched galactic outflows shape the mass-metallicity relationship
- An H-alpha survey aiming at the detection of extraplanar diffuse ionized gas in halos of edge-on spiral galaxies II. The H-alpha survey atlas and catalog
- Young Super Star Clusters in the Starburst of M82: The Catalogue
- The variable hard X-ray emission of NGC4945 as observed by NuSTAR
- Temperature and Metallicity Gradients in the Hot Gas Outflows of M82
- A search for HI absorption in nearby radio galaxies using HIPASS
- High-resolution X-ray imaging and spectroscopy of the core of NGC 4945 with XMM-Newton and Chandra
- The X-ray reflector in NGC 4945: a time and space resolved portrait
- Charge Exchange X-ray Emission of Nearby Star-forming Galaxies
- Measurement of the Mass and Stellar Population Distribution in M82 with the LBT
- The Resolved Stellar Halo of NGC 253
- Charge Exchange X-ray Emission of M82: Kα triplets of O VII, Ne IX, and Mg XI
- Simultaneous Chandra and RXTE observations of the nearby bright Seyfert 2 galaxy NGC4945
- Super Star Clusters in the Central Starburst of NGC 4945
- Spatially resolved Fe K spectroscopy of NGC 4945
- Spectral Modeling of the Charge-Exchange X-ray Emission from M82
- Free-free and H42alpha emission from the dusty starburst within NGC 4945 as observed by ALMA
- Atomic and Molecular Gas in the Starburst Galaxy NGC4945
- Ionized Gas Outflows from the MAGNUM Survey: NGC 1365 and NGC 4945
- X-ray Properties of NGC 253's Starburst-Driven Outflow
- The Morpho-Kinematic Architecture of Super Star Clusters in the Center of NGC253
- Black Holes and Neutron Stars in Nearby Galaxies: Insights from NuSTAR