The extra-planar neutral gas in the edge-on spiral galaxy NGC 891
Filippo Fraternali (University of Oxford), Tom Oosterloo (ASTRON),, Renzo Sancisi (INAF-Bologna & Kapteyn), Rob Swaters (University of Maryland)
TL;DR
This study investigates the extended neutral hydrogen gas in NGC 891, revealing a rotating halo with a velocity gradient and exploring a galactic fountain model to explain the extra-planar gas distribution.
Contribution
It provides detailed 3D modeling of the extra-planar gas in NGC 891 and introduces preliminary galactic fountain simulations for this galaxy.
Findings
Extended extra-planar HI emission up to 15 kpc from the plane.
Halo gas rotates more slowly than disk gas with a gradient of -15 km/s/kpc.
Preliminary galactic fountain model results for NGC 891.
Abstract
We present neutral hydrogen observations of the nearby edge-on spiral galaxy NGC891 which show extended extra-planar emission up to distances of 15 kpc from the plane. 3D modeling of the galaxy shows that this emission comes from halo gas rotating more slowly than the gas in the disk.We derive the rotation curves of the gas above the plane and find a gradient in rotation velocity of -15 km/s/kpc. We also present preliminary results of a galactic fountain model applied to NGC891.
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astrophysics and Star Formation Studies · Stellar, planetary, and galactic studies