The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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Comparison of the extraplanar Hα and UV emission in the halo of nearby edge-on spiral galaxies

  • Jo, Young-Soo (Korea Advanced Institute of Science and Technology (KAIST)) ;
  • Seon, Kwang-Il (Korea Astronomy and Space Science Institute (KASI)) ;
  • Shinn, Jong-Ho (Korea Astronomy and Space Science Institute (KASI)) ;
  • Yang, Yujin (Korea Astronomy and Space Science Institute (KASI)) ;
  • Lee, Dukhang (Korea Astronomy and Space Science Institute (KASI)) ;
  • Min, Kyoung-wook (Korea Advanced Institute of Science and Technology (KAIST))
  • Published : 2017.10.10
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Abstract

We compare vertical profiles of the extraplanar $H{\alpha}$ emission to those of FUV and NUV emission for 39 nearby edge-on galaxies to investigate the origin of the extraplanar $H{\alpha}$ emission. A strong correlation between scale heights of the extraplanar $H{\alpha}$ and UV emissions is found. This may indicate that the diffuse extraplanar $H{\alpha}$ emission either co-exists with the extraplanar dust or originates from the similar mechanism as the diffuse extraplanar UV emission such as scattering of $H{\alpha}$ photons at diffuse extraplanar dust. The scale heights of the extraplanar $H{\alpha}$ and UV emissions are also compared with size, star formation rate, and star formation rate surface density of the host galaxies to figure out what is the most important parameter associated with the extraplanar emission.

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