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Halo Gas Velocities of NGC 4244 and NGC 891 Using Multi-long-slit Spectroscopy

Published online by Cambridge University Press:  17 September 2012

C.J. Wu
Affiliation:
New Mexico State University, Las Cruces, New Mexico. e-mail: catwu@nmsu.edu;
R. Walterbos
Affiliation:
New Mexico State University, Las Cruces, New Mexico. e-mail: catwu@nmsu.edu;
J. Choi
Affiliation:
New Mexico State University, Las Cruces, New Mexico. e-mail: catwu@nmsu.edu;
R.J. Rand
Affiliation:
University of New Mexico, Albuquerque, New Mexico
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Abstract

Extra-planar gas in spiral galaxies can originate from disk-halo cycling driven by star formation in the disk or from infalling gas clouds. Studying the kinematics of halo gas can provide evidence for which scenario is more plausible. Edge-on galaxies provide a direct view of the extra-planar gas. We measure gas velocities from Hα emission as a function of height above the galactic disk for NGC 4244, which has a low star formation rate, and NGC 891, which has a high star formation rate. Using a multi-slit setup on the ARC 3.5 m telescope, we are able to measure velocities along 16 slits simultaneously. We compare our preliminary results to studies of HI velocities in these galaxies.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2012

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