NOAO >   Observing Info >   Approved Programs >   2007A-0294

Small NOAO Logo

Proposal Information for 2007A-0294


PI: Sharon E. Meidt, University of New Mexico, shmeidt@unm.edu
Address: Physics Department, 800 Yale Blvd NE, Albuquerque, NM 87110, USA

CoI: Richard J. Rand, University of New Mexico

Title: Spiral Pattern Speeds Using the Tremaine-Weinberg Method

Abstract: We request three grey nights using SparsePak on WIYN to attempt to determine the pattern speed of the spiral galaxy NGC 6070 using the Tremaine-Weinberg method and observations of the old disk kinematics. The method requires a high-quality velocity field of the disk as well as an intensity map. Pattern speeds of many stellar bars have been determined in this way, but with the advent of SparsePak, it is now possible for the first time to attempt the method efficiently on the much fainter disks. NGC 6070 is perfectly suited to this method and the parameters of SparsePak, and can be observed with just two pointings of the fiber array. We will observe the region around the Mg B triplet and use cross-correlation techniques to determine mean velocities in each fiber (with an accuracy of ~4 km s^-1), along with an existing K-band image to determine the intensity of the old disk starlight.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2007A-0294

noaoprop-help@noao.edu

Small NOAO Logo