Hot Gas Outflow Properties of the Starburst Galaxy NGC 4945

被引：2
作者：
Barrera, Natalia Porraz [1 ]
Lopez, Sebastian [1 ,2 ]
Lopez, Laura A. [1 ,2 ]
Foord, Adi [3 ]
Nguyen, Dustin D. [2 ,4 ]
Thompson, Todd A. [1 ,2 ]
Mathur, Smita [1 ,2 ]
Bolatto, Alberto D. [5 ,6 ]
机构：
[1] Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA
[2] Ohio State Univ, Ctr Cosmol & AstroParticle Phys, 191 W Woodruff Ave, Columbus, OH 43210 USA
[3] Univ Maryland Baltimore Cty, Dept Phys, 1000 Hilltop Circle, Baltimore, MD 21250 USA
[4] Ohio State Univ, Dept Phys, 191 W Woodruff Ave, Columbus, OH 43210 USA
[5] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[6] Univ Maryland, Joint Space Sci Inst, College Pk, MD 20742 USA
来源：
ASTROPHYSICAL JOURNAL | 2024年 / 968卷 / 02期
基金：
美国国家航空航天局;
关键词：
X-RAY-EMISSION; SUPER STAR-CLUSTERS; H-ALPHA; IONIZED-GAS; XMM-NEWTON; MASS; ASTROPY; HALOS; CORE; M82;
D O I：
10.3847/1538-4357/ad4606
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We analyze 330 ks of 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 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 nonspherical outflow geometry. We estimate the mass outflow rate of the hot wind to be 1.6 M circle dot yr-1. Emission from charge exchange is detected in the northern outflow, and we estimate it contributes 12% to the emitted, broadband (0.5-7 keV) X-ray flux.
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页数：9
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