OVI Emission in the Halos of Edge-on Spiral Galaxies

Abstract

We have used the Far Ultraviolet Spectroscopic Explorer to search for OVI 1031.926, 1037.617 A emission in the halos of the edge-on spiral galaxies NGC4631 and NGC891. In NGC4631, we detected OVI in emission toward a soft X-ray bubble above a region containing numerous Halpha arcs and filaments. The line-of-sight component of the motion of the OVI gas appears to match the underlying disk rotation. The observed OVI luminosities can account for 0.2-2% of the total energy input from supernovae (assuming a full OVI emitting halo) and yield mass flux cooling rates between 0.48 and 2.8 M_sun/yr depending on the model used in the derivations. Based on these findings, we believe it is likely that we are seeing cooling, galactic fountain gas. No emission was detected from the halo of NGC891, a galaxy in a direction with considerably high foreground Galactic extinction.

accepted for publication in ApJ, 16 pages including 4 figures

References in corpus (2)

• Distribution and Kinematics of O VI in the Galactic Halo
• FUSE Detection of Galactic OVI Emission in the Halo above the Perseus Arm

Cited by in corpus (17)

• Galactic Winds
• Gaseous Galaxy Halos
• Feedback in the local LBG Analog Haro 11 as probed by far-UV and X-ray observations
• Properties of O VI Absorption in the Local Interstellar Medium
• The dynamics and high-energy emission of conductive gas clouds in supernova-driven galactic superwinds
• O VI Emission Imaging of a Galaxy with the Hubble Space Telescope: a Warm Gas Halo Surrounding the Intense Starburst SDSS J115630.63+500822.1
• A Deep X-ray View of the Hot Halo in the Edge-on Spiral Galaxy NGC 891
• X-ray Halo Around the Spiral Galaxy NGC 4631 Observed with Suzaku
• High-Velocity Clouds and the Local Intergalactic Medium
• The impact of cosmic rays on dynamical balance and disk-halo interaction in Lstar disk galaxies
• The JCMT Nearby Galaxies Legacy Survey V: The CO(J=3-2) Distribution and Molecular Outflow in NGC~4631
• Catastrophic Cooling in Superwinds. III. Non-equilibrium Photoionization
• The ALPINE-ALMA [CII] survey: double stellar population and AGN activity in a galaxy at $z\sim 5.5$
• Revisiting FUSE O VI Emission in Galaxy Halos
• An X-ray View of the Hot Circum-Galactic Medium
• Absorption-based Circumgalactic Medium Line Emission Estimates
• OVI Emission From the Supernovae-regulated Interstellar Medium: Simulation Vs Observation