تقرير
Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. IV. The Effects of Different Density Estimates on the Ionized Gas Masses and Outflow Rates
| العنوان: | Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. IV. The Effects of Different Density Estimates on the Ionized Gas Masses and Outflow Rates |
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| المؤلفون: | Mitchell Revalski, Michael Crenshaw, Marc Rafelski, Steven B Kraemer, Garrett E Polack, Anna Trindade Falcão, Travis C Fischer, Beena Meena, Francisco Martinez, Henrique R Schmitt, Nicholas R Collins, Julia Falcone |
| المصدر: | The Astrophysical Journal. 930(1) |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Astrophysics |
| الوصف: | Active galactic nuclei (AGN) can launch outflows of ionized gas that may influence galaxy evolution, and quantifying their full impact requires spatially resolved measurements of the gas masses, velocities, and radial extents. We previously reported these quantities for the ionized narrow-line region outflows in six low-redshift AGN, where the gas velocities and extents were determined from Hubble Space Telescope long-slit spectroscopy. However, calculating the gas masses required multicomponent photoionization models to account for radial variations in the gas densities, which span ∼6 orders of magnitude. To simplify this method for larger samples with less spectral coverage, we compare these gas masses with those calculated from techniques in the literature. First, we use a recombination equation with three different estimates for the radial density profiles. These include constant densities, those derived from [S ii], and power-law profiles based on constant values of the ionization parameter (U). Second, we use single-component photoionization models with power-law density profiles based on constant U, and allow U to vary with radius based on the [O iii]/Hβ ratios. We find that assuming a constant density of nH = 10(^2) cm(^−3) overestimates the gas masses for all six outflows, particularly at small radii where the outflow rates peak. The use of [S ii] marginally matches the total gas masses, but also overestimates at small radii. Overall, single-component photoionization models where U varies with radius are able to best match the gas mass and outflow rate profiles when there are insufficient emission lines to construct detailed models. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| تدمد: | 1538-4357 0004-637X |
| DOI: | 10.3847/1538-4357/ac5f3d |
| URL الوصول: | https://ntrs.nasa.gov/citations/20220005055 |
| ملاحظات: | NAG5-4103 NAS5-26555 80GSFC17C0003 NNX17AC49G DDRF-82490 |
| رقم الأكسشن: | edsnas.20220005055 |
| قاعدة البيانات: | NASA Technical Reports |
Full Text Finder | تدمد: | 15384357 0004637X |
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| DOI: | 10.3847/1538-4357/ac5f3d |