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

Abstract

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 (NLR) 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 multi-component photoionization models to account for radial variations in the gas densities, which span $\sim$6 orders of magnitude. In order to simplify this method for larger samples with less spectral coverage, we compare these gas masses with those calculated from techniques in the literature. First, we use a recombination equation with three different estimates for the radial density profiles. These include constant densities, those derived from [S II], and power-law profiles based on constant values of the ionization parameter ($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]/H$\beta$ ratios. We find that assuming a constant density of $n_{\mathrm{H}}=$ 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.

Accepted for Publication in ApJ on March 11, 2022. The paper has 20 pages and 8 figures, with results tabulated in the Appendix. Version two includes minor corrections to match the journal publication

References in corpus (32)

• The Co-Evolution of Galaxies and Supermassive Black Holes: Insights from Surveys of the Contemporary Universe
• A Reverberation-Based Mass for the Central Black Hole in NGC 4151
• The WISSH Quasars Project I. Powerful ionised outflows in hyper-luminous quasars
• Ionized outflows from active galactic nuclei as the essential elements of feedback
• Observational Constraints on the Feeding of Supermassive Black Holes
• New Indicators for AGN Power: The Correlation Between [O IV] lambda 25.89 micron and Hard X-ray Luminosity for Nearby Seyfert Galaxies
• Size and properties of the narrow-line region in Seyfert-1 galaxies from spatially-resolved optical spectroscopy
• Discovering AGN-driven winds through their infrared emission: II. Mass outflow rate and energetics
• Ionised gas outflow signatures in SDSS-IV MaNGA active galactic nuclei
• NuSTAR unveils a Compton-thick Type 2 quasar in Mrk 34
• AGNIFS survey of local AGN: GMOS-IFU data and outflows in 30 sources
• The Limited Impact of Outflows: Integral-Field Spectroscopy of 20 Local AGNs
• Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. III. Results for the Seyfert 2 Galaxies Markarian 3, Markarian 78, and NGC 1068
• Feedback from Mass Outflows in Nearby Active Galactic Nuclei. II. Outflows in the Narrow-Line Region of NGC 4151
• Incidence, scaling relations and physical conditions of ionised gas outflows in MaNGA
• Unravelling the complex structure of AGN-driven outflows: II. Photoionization and energetics
• BASS XXXI: Outflow scaling relations in low redshift X-ray AGN host galaxies with MUSE
• Modelling narrow-line regions of active galaxies in the Sloan Digital Sky Survey - I.Sample selection and physical conditions
• Gauging the effect of Supermassive Black Holes feedback on Quasar host galaxies
• Multi-phase outflows in high redshift quasar host galaxies
• Ionised Gas Kinematics in MaNGA AGN. Extents of the Narrow Line and Kinematically Disturbed regions
• Gemini NIFS survey of feeding and feedback in nearby Active Galaxies -- V. Molecular and Ionised Gas Kinematics
• From Nuclear to Circumgalactic: Zooming in on AGN-Driven Outflows at z~2.2 with SINFONI
• SUPER V. ALMA continuum observations of z~2 AGN and the elusive evidence of outflows influencing star formation
• The Origin of Double-Peaked Narrow Lines in Active Galactic Nuclei III: Feedback from Biconical AGN Outflows
• The MURALES survey. IV. Searching for nuclear outflows in 3C radio galaxies at z < 0.3 with MUSE observations
• Gemini Near-Infrared Field Spectrograph Observations of the Seyfert 2 Galaxy Mrk 3: Feeding and Feedback on Galactic and Nuclear Scales
• Probing the hot X-ray gas in the narrow-line region of Mrk 3
• Unraveling the complex structure of AGN-driven outflows: V. Integral-field spectroscopy of 40 moderate-luminosity Type-2 AGNs
• Powerful multiphase outflows in the central region of Cygnus A
• AGN and Star Formation at Cosmic Noon: Comparison of Data to Theoretical Models
• Density profile of ambient circumnuclear medium in Seyfert 1 galaxies