Comparison of the extraplanar H$\alpha$ and UV emissions in the halos of nearby edge-on spiral galaxies

Abstract

We compare vertical profiles of the extraplanar H$\alpha$ emission to those of the UV emission for 38 nearby edge-on late-type galaxies. It is found that detection of the "diffuse" extraplanar dust (eDust), traced by the vertically extended, scattered UV starlight, always coincides with the presence of the extraplanar H$\alpha$ emission. A strong correlation between the scale heights of the extraplanar H$\alpha$ and UV emissions is also found; the scale height at H$\alpha$ is found to be $\sim 0.74$ of the scale height at FUV. Our results may indicate the multiphase nature of the diffuse ionized gas and dust in the galactic halos. The existence of eDust in galaxies where the extraplanar H$\alpha$ emission is detected suggests that a larger portion of the extraplanar H$\alpha$ emission than that predicted in previous studies may be caused by H$\alpha$ photons that originate from H II regions in the galactic plane and are subsequently scattered by the eDust. This possibility raise a in studying the eDIG. We also find that the scale heights of the extraplanar emissions normalized to the galaxy size correlate well with the star formation rate surface density of the galaxies. The properties of eDust in our galaxies is on a continuation line of that found through previous observations of the extraplanar polycyclic aromatic hydrocarbons emission in more active galaxies known to have galactic winds.

arXiv comment25 pages; 6 figures; It was accepted for publication in The Astrophysical Journal at June 7, 2018

References in corpus (61)

• The Global Schmidt Law in Star Forming Galaxies
• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• Galactic Winds
• SINGS: The SIRTF Nearby Galaxies Survey
• Starburst-driven Mass Loss from Dwarf Galaxies: Efficiency and Metal Ejection
• Scattering by Interstellar Dust Grains: Optical and Ultraviolet
• Optical Spectroscopy and Nebular Oxygen Abundances of the Spitzer/SINGS Galaxies
• The Spitzer Local Volume Legacy: Survey Description and Infrared Photometry
• Gaseous Galaxy Halos
• An H-alpha Imaging Survey of Galaxies in the Local 11 Mpc Volume
• A high spatial resolution X-ray and H-alpha study of hot gas in the halos of star-forming disk galaxies. I. Spatial and spectral properties of the diffuse X-ray emission
• The warm ionized medium in spiral galaxies
• The On-Orbit Performance of the Galaxy Evolution Explorer
• Introducing GOLDMine: A new Galaxy Database on the WEB
• The Vertical Structure of Warm Ionised Gas in the Milky Way
• A high spatial resolution X-ray and H-alpha study of hot gas in the halos of star-forming disk galaxies. II. Quantifying supernova feedback
• SDSS-IV MaNGA: The Impact of Diffuse Ionized Gas on Emission-line Ratios, Interpretation of Diagnostic Diagrams, and Gas Metallicity Measurements
• The Survey for Ionization in Neutral Gas Galaxies: I. Description and Initial Results
• The H alpha Galaxy Survey I. The galaxy sample, H alpha narrow-band observations and star formation parameters for 334 galaxies
• A Search for Extraplanar Dust in Nearby Edge-On Spirals
• 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?
• Tightly Correlated X-ray/H$\alpha$ Emitting Filaments in the Superbubble and Large-Scale Superwind of NGC 3079
• The Contribution of Field OB Stars to the Ionization of the Diffuse Ionized Gas in M33
• Monte Carlo simulations of dusty spiral galaxies: extinction and polarization properties
• Extraplanar Dust in the Edge-On Spiral NGC 891
• A Model for the Scattered Light Contribution and Polarization of the Diffuse H$\alpha$ Galactic Background
• GALEX Observations of the Ultraviolet Halos of NGC 253 and M82
• The influence of diffuse scattered light I. The PSF and its role to observations of the edge-on galaxy NGC 5907
• 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
• The distribution of interstellar dust in CALIFA edge-on galaxies via oligochromatic radiative transfer fitting
• Far Ultraviolet and H-alpha Imaging of Nearby Spirals: The OB Stellar Population in the Diffuse Ionized Gas
• The SAMI Galaxy Survey: extraplanar gas, galactic winds, and their association with star formation history
• The emissivity of dust grains in spiral galaxies
• The origin of the ionization of the diffuse interstellar medium in spiral galaxies. II. Modelling the distribution of ionizing radiation in NGC 157
• The Multiphase Halo of NGC 891: WIYN H-alpha and BVI Imaging
• Extraplanar Emission-Line Gas in Edge-On Spiral Galaxies. I. Deep Emission-Line Imaging
• Photoionization of High Altitude Gas in a Supernova-Driven Turbulent Interstellar Medium
• Monte Carlo Photoionization Simulations of Diffuse Ionized Gas
• The influence of diffuse scattered light II. Observations of galaxy haloes and thick discs and hosts of BCGs
• A Hubble Space Telescope WFPC2 Investigation of the Disk-Halo Interface in NGC891
• Discovery of PAHs in the Halo of NGC 5907
• Extraplanar Emission-Line Gas in Edge-On Spiral Galaxies. II. Optical Spectroscopy
• Detection of Ultraviolet Halos around Highly Inclined Galaxies
• Halpha3: Halpha imaging survey of HI selected galaxies from ALFALFA
• Diffuse Extraplanar Dust in NGC 891
• HERschel Observations of Edge-on Spirals (HEROES). I: Far-infrared morphology and dust mass determination
• H-alpha and Free-Free Emission from the WIM
• Can the Lyman Continuum leaked out of H II regions explain Diffuse Ionized Gas?
• On the origins of the diffuse H-alpha emission: Ionized gas or dust-scattered H-alpha halos?
• SDSS IV MaNGA: Deep observations of extra-planar, diffuse ionized gas around late-type galaxies from stacked IFU spectra
• Halo dust detection around NGC 891
• Polarization in Monte Carlo radiative transfer and dust scattering polarization signatures of spiral galaxies
• The Effect of Light Scattering by Dust in Galactic Halos on Emission Line Ratios
• Models of Diffuse Hα in the Interstellar Medium: The Relative Contributions from In Situ Ionisation and Dust Scattering
• AKARI Detection of Far-Infrared Dust Emission in the Halo of NGC253
• Comparison of the Diffuse Halpha and FUV Continuum Backgrounds: On the Origins of the Diffuse Halpha Background
• Ultraviolet Halos Around Spiral Galaxies. I. Morphology
• Ultraviolet Radiative Transfer Modeling of Nearby Galaxies with Extraplanar Dusts
• The nature of the UV halo around the spiral galaxy NGC 3628
• The Relationship Between the Dense Neutral and Diffuse Ionized Gas in the Thick Disks of Two Edge-On Spiral Galaxies

Cited by in corpus (15)

• Cool Outflows in Galaxies and their Implications
• H-alpha emission in local galaxies: star formation, time variability and the diffuse ionized gas
• Diffuse Ionized Gas in Simulations of Multiphase, Star-Forming Galactic Disks
• Extragalactic Background Light: Inventory of light throughout the cosmic history
• The multifarious ionization sources and disturbed kinematics of extraplanar gas in five low-mass galaxies
• eDIG-CHANGES I: Extended Hα Emission from the Extraplanar Diffuse Ionized Gas (eDIG) around CHANG-ES Galaxies
• The distribution of dust in edge-on galaxies: I. The global structure
• Multi-Phase Magnetic Fields in the Galaxy NGC 3627
• JWST MIRI and NIRCam observations of NGC 891 and its circumgalactic medium
• Tilted outer and inner structures in edge-on galaxies?
• Bidimensional Exploration of the warm-Temperature Ionised gaS (BETIS) II. Revisiting the ionisation mechanism of the extraplanar diffuse ionised gas
• Chandra survey of nearby highly inclined disk galaxies -- V: emission structure and origin of galactic coronae
• Constraining the top-light initial mass function in the extended ultraviolet disk of M83
• Observing the Earliest Stages of Star Formation in Galaxies: 8 micron Cores in Three Edge-on Disks
• Extraplanar emission in isolated edge-on late-type galaxies. I. The H$\alpha$ distribution versus to the old and young stellar discs