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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 ,
R. Walterbos ,
J. Choi  and
R.J. Rand
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
Information
European Astronomical Society Publications Series , Volume 56: The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall? , 2012 , pp. 251 - 254
Copyright
© EAS, EDP Sciences, 2012

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