NOAO > Observing Info > Approved Programs > 2004A-0290
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NOAO > Observing Info > Approved Programs > 2004A-0290 |
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PI: George H. Heald, University of New Mexico, gheald@phys.unm.edu
Address: Physics Department, 800 Yale Blvd NE, Albuquerque, New Mexico 87131, USA
CoI: Richard J. Rand, University of New Mexico
CoI: Robert A. Benjamin, University of Wisconsin - Whitewater
CoI: Matthew A. Bershady, University of Wisconsin - Madison
Title: Kinematics of the Disk--Halo Flow in NGC 4302
Abstract:
The importance of cycling of gas between disks and halos of galaxies
is now well established in the evolution of ISMs. However, only limited
information is available on the kinematics of such flows. Long-slit
spectra for the edge-ons NGC 891 and NGC 5775 show that the decrease of
rotation speed of diffuse ionized gas with height off the plane is less
than expected from ballistic models of disk--halo flow, especially for
the less active NGC 891. These results may imply that disk gas and halo
gas are coupled, or that an outwardly directed pressure gradient in the
halo maintains the higher velocities. The results also suggest that
(magneto-)hydrostatic/hydrodynamic effects may be more important in
spirals with less active flows. Our goal is to obtain velocity data for
NGC 4302, an edge-on with a less prominent halo. We will use SparsePak
on WIYN to provide much better sampling of the entire halo velocity
field than is possible with long-slits. These data will be used to
constra!
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2004A-0290 |
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