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Astronomy Department Faculty Publication Series
Galaxies: individual (NGC 4631); galaxies: ISM; galaxies: spiral; radio lines: general
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Full-Text Articles in Physical Sciences and Mathematics
The Origin Of The Dust Arch In The Halo Of Ngc 4631: An Expanding Superbubble?, Cl Taylor, Qd Wang
The Origin Of The Dust Arch In The Halo Of Ngc 4631: An Expanding Superbubble?, Cl Taylor, Qd Wang
Astronomy Department Faculty Publication Series
We study the nature and the origin of the dust arch in the halo of the edge-on galaxy NGC 4631 detected by Neininger & Dumke. We present CO observations made using the new on-the-fly mapping mode with the Five College Radio Astronomy Observatory 14 m telescope and find no evidence for CO emission associated with the dust arch. Our examination of previously published H I data shows that, if previous assumptions about the dust temperature and gas/dust ratio are correct, then there must be molecular gas associated with the arch, below our detection threshold. If this is true, then the …