Spatially Resolved Properties of Extraplanar Diffuse Ionized Gas in NGC3511 and NGC3513

Abstract

Gaseous, disk-halo interfaces are shaped by processes that are critical to galaxy evolution, including gas accretion and outflows. Extraplanar diffuse ionized gas (eDIG) layers are characterized by scale heights that largely exceed those predicted by their temperature, suggesting the presence of turbulent energy injection from star formation feedback. However, the origin of this large scale height remains uncertain. To explore the connection between eDIG and star-forming disks, we present a spatially-resolved case study of a nearby pair of sub-$L_{\ast }$, intermediately inclined disk galaxies NGC3511/3513. We decompose optical nebular lines observed using long-slit spectroscopy into narrow and broad velocity components. In NGC3511, the broad component has three distinctive characteristics in comparison to the narrow component: (1) significantly higher velocity dispersions (a median $⟨\sigma {⟩}_{\text{Broad}}=24$ \kms compared to $⟨\sigma {⟩}_{\text{Narrow}}=13$ \kms), (2) elevated [NII]$\lambda$6583/H$\alpha$ and [SII]$\lambda$6716/H$\alpha$ line ratios, and (3) a rotational velocity lag. These characteristics support the origin of the broad component in an extraplanar, gaseous disk. In NGC3513, the broad component reveals disk-halo circulation via localized outflows at radius $\lesssim 1$ kpc. For NGC3511, we test a vertical hydrostatic equilibrium model with pressure support supplied by thermal and turbulent motions. Under this assumption, the eDIG velocity dispersion corresponds to a scale height $h_z\gtrsim 0.2-0.4$ kpc at $R=3-5$ kpc, a factor of a few above the thermal scale height ($h_z\lesssim 0.1$ kpc). This highlights the importance of turbulent motions to the vertical structure of the gaseous, disk-halo interface.

16 pages, 14 figures, comments are welcome

References in corpus (54)

• emcee: The MCMC Hammer
• A Universal Density Profile from Hierarchical Clustering
• The chemical composition of the Sun
• Star Formation in Galaxies Along the Hubble Sequence
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• Galactic Winds
• UniverseMachine: The Correlation between Galaxy Growth and Dark Matter Halo Assembly from z=0-10
• HyperLEDA. III. The catalogue of extragalactic distances
• Observational evidence for AGN feedback in early-type galaxies
• The 1000 Brightest HIPASS Galaxies: HI Properties
• Cosmicflows-3
• The Wisconsin H-Alpha Mapper Northern Sky Survey
• The warm ionized medium in spiral galaxies
• The cold gaseous halo of NGC 891
• A z=0 Multi-wavelength Galaxy Synthesis I: A WISE and GALEX Atlas of Local Galaxies
• The Cosmic BPT Diagram: Confronting Theory with Observations
• Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy
• An accurate physical model for halo concentrations
• WHAM Observations of H-Alpha, [S II], and [N II] toward the Orion and Perseus Arms: Probing the Physical Conditions of the Warm Ionized Medium
• Modeling the Warm Ionized Interstellar Medium and Its Impact on Elemental Abundance Studies
• Diffuse Ionized Gas in Edge-on Spiral Galaxies: Extraplanar and Outer Disk H-alpha Emission
• Supernova-driven gas accretion in the Milky Way
• An H-alpha survey aiming at the detection of extraplanar diffuse ionized gas in halos of edge-on spiral galaxies. I. How common are gaseous halos among non-starburst galaxies?
• Further Spectroscopy of the Diffuse Ionized Gas in NGC 891 and Evidence for a Secondary Source of Ionization
• Ionization Sources and Physical Conditions in the Diffuse Ionized Gas Halos of Four Edge-On Galaxies
• 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
• Cosmicflows-3: Two Distance$-$Velocity Calculators
• Kinematics of Diffuse Ionized Gas Halos: A Ballistic Model of Halo Rotation
• Integral Field Unit Observations of NGC 891: Kinematics of the Diffuse Ionized Gas Halo
• Integral Field Unit Observations of NGC 4302: Kinematics of the Diffuse Ionized Gas Halo
• Characterizing the Circumgalactic Medium of Nearby Galaxies with HST/COS and HST/STIS Absorption-Line Spectroscopy: II. Methods and Models
• The size--density relation of extragalactic HII regions
• HALOGAS: Extraplanar gas in NGC 3198
• An IRAS High Resolution Image Restoration (HIRES) Atlas of All Interacting Galaxies in the IRAS Revised Bright Galaxy Sample
• Cosmic Ray Heating of the Warm Ionized Medium
• Extraplanar Emission-Line Gas in Edge-On Spiral Galaxies. I. Deep Emission-Line Imaging
• The EDGE-CALIFA Survey: Evidence for Pervasive Extraplanar Diffuse Ionized Gas in Nearby Edge-On Galaxies
• HALOGAS: the properties of extraplanar HI in disc galaxies
• Imaging Fabry-Perot Spectroscopy of NGC 5775: Kinematics of the Diffuse Ionized Gas Halo
• Kinematics of the Ionised Gas in the Spiral Galaxy NGC 2403
• Extraplanar Emission-Line Gas in Edge-On Spiral Galaxies. II. Optical Spectroscopy
• SDSS IV MaNGA: Deep observations of extra-planar, diffuse ionized gas around late-type galaxies from stacked IFU spectra
• FLASH redshift survey - I. Observations and Catalogue
• SDSS IV MaNGA - Rotation Velocity Lags in the Extraplanar Ionized Gas from MaNGA Observations of Edge-on Galaxies
• The impact of cosmic rays on dynamical balance and disk-halo interaction in Lstar disk galaxies
• Testing a Dynamical Equilibrium Model of the Extraplanar Diffuse Ionized Gas in NGC 891
• An Introduction to Gas Accretion onto Galaxies
• Fountain-driven gas accretion feeding star formation over the disc of NGC 2403
• A Census of the Extended Neutral Hydrogen Around 18 MHONGOOSE Galaxies
• Stationary models for the extra-planar gas in disc galaxies
• A Dynamical Study of Extraplanar Diffuse Ionized Gas in NGC 5775
• A Kinematic Analysis of Ionised Extraplanar Gas in the Spiral Galaxies NGC 3982 and NGC 4152
• Detection of Extraplanar Diffuse Ionized Gas in M83