A Dynamical Study of Extraplanar Diffuse Ionized Gas in NGC 5775

Abstract

The structure and kinematics of gaseous, disk-halo interfaces are imprinted with the processes that transfer mass, metals, and energy between galactic disks and their environments. We study the extraplanar diffuse ionized gas (eDIG) layer in the interacting, star-forming galaxy NGC 5775 to better understand the consequences of star-formation feedback on the dynamical state of the thick-disk interstellar medium (ISM). Combining emission-line spectroscopy from the Robert Stobie Spectrograph on the Southern African Large Telescope with radio continuum observations from Continuum Halos in Nearby Galaxies - an EVLA Survey, we ask whether thermal, turbulent, magnetic field, and cosmic-ray pressure gradients can stably support the eDIG layer in dynamical equilibrium. This model fails to reproduce the observed exponential electron scale heights of the eDIG thick disk and halo on the northeast ($h_{z,e}=0.6,7.5$ kpc) and southwest ($h_{z,e}=0.8,3.6$ kpc) sides of the galaxy at $R<11$ kpc. We report the first definitive detection of an increasing eDIG velocity dispersion as a function of height above the disk. Blueshifted gas along the minor axis at large distances from the midplane hints at a disk-halo circulation and/or ram pressure effects caused by the ongoing interaction with NGC 5774. This work motivates further integral field unit and/or Fabry-Perot spectroscopy of galaxies with a range of star-formation rates to develop a spatially-resolved understanding of the role of star-formation feedback in shaping the kinematics of the disk-halo interface.

arXiv comment20 pages, 12 figures, accepted for publication in the Astrophysical Journal

References in corpus (35)

• The chemical composition of the Sun
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Cosmic-Ray Rejection by Laplacian Edge Detection
• Galactic Winds
• The Interstellar Environment of our Galaxy
• Magnetic Fields in Spiral Galaxies
• 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
• Vertical structure of a supernova-driven turbulent magnetized ISM
• Chandra Survey of Nearby Highly-Inclined Disk Galaxies I: X-ray Measurements of Galactic Coronae
• Supernova-driven gas accretion in the Milky Way
• CHANG-ES IV: Radio continuum emission of 35 edge-on galaxies observed with the Karl G. Jansky Very Large Array in D-configuration, Data Release 1
• 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
• Continuum Halos in Nearby Galaxies -- an EVLA Survey (CHANG-ES) -- I: Introduction to the Survey
• Chandra Observation of the Edge-on Spiral NGC 5775: Probing the Hot Galactic Disk/Halo Connection
• Ionization Sources and Physical Conditions in the Diffuse Ionized Gas Halos of Four Edge-On Galaxies
• A New Prescription for Protogalactic Feedback and Outflows: Where Have All the Baryons Gone?
• Kinematics of Diffuse Ionized Gas Halos: A Ballistic Model of Halo Rotation
• CHANG-ES IX: Radio scale heights and scale lengths of a consistent sample of 13 spiral galaxies seen edge-on and their correlations
• Cosmic Ray Heating of the Warm Ionized Medium
• Ionization, Kinematics, and Extent of the Diffuse Ionized Gas Halo of NGC 5775
• The large scale magnetic field structure of the spiral galaxy NGC 5775
• Faint, Large-scale H-Alpha Filaments in the Milky Way
• Imaging Fabry-Perot Spectroscopy of NGC 5775: Kinematics of the Diffuse Ionized Gas Halo
• Equipartition and Cosmic Ray Energy Densities in Central Molecular Zones of Starbursts
• Emission Line Ratios and Variations in Temperature and Ionization State in the Diffuse Ionized Gas of Five Edge-on Galaxies
• The Parker Instability with Cosmic Ray Streaming
• Testing a Dynamical Equilibrium Model of the Extraplanar Diffuse Ionized Gas in NGC 891
• Infrared Spectroscopy of Halos of Edge-on Galaxies
• Hydrostatic equilibrium in a magnetized, warped Galactic disc
• Detection of Extraplanar Diffuse Ionized Gas in M83
• High Latitude Dust and the 617 MHz - 850 μm relation in NGC 5775
• Discovery of High-Latitude CO in a HI Supershell in NGC 5775

Cited by in corpus (10)

• Diffuse Ionized Gas in Simulations of Multiphase, Star-Forming Galactic Disks
• The impact of cosmic rays on dynamical balance and disk-halo interaction in Lstar disk galaxies
• CHANG-ES XXIII: Influence of a galactic wind in NGC 5775
• eDIG-CHANGES I: Extended Hα Emission from the Extraplanar Diffuse Ionized Gas (eDIG) around CHANG-ES Galaxies
• Extraplanar gas in Edge-on Galaxies traced by SOFIA observations of [C II]
• CHANG-ES XXXII: Spatially Resolved Thermal/Nonthermal Separation from Radio Data Alone -- New Probes into NGC 3044 and NGC 5775
• Bidimensional Exploration of the warm-Temperature Ionised gaS (BETIS) II. Revisiting the ionisation mechanism of the extraplanar diffuse ionised gas
• Shocked POststarburst Galaxy Survey. IV. Outflows in Shocked Post-Starburst Galaxies Are Not Responsible For Quenching
• An Imaging and Spectroscopic Exploration of the Dusty Compact Obscured Nucleus Galaxy Zw~049.057
• Spatially Resolved Properties of Extraplanar Diffuse Ionized Gas in NGC3511 and NGC3513