NOAO >   Observing Info >   Approved Programs >   2004A-0290

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Proposal Information for 2004A-0290


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!


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NOAO >   Observing Info >   Approved Programs >   2004A-0290

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