NOAO >   Observing Info >   Approved Programs >   2003A-0289

Small NOAO Logo

Proposal Information for 2003A-0289


PI: Joshua Simon, University of California at Berkeley, jsimon@astro.berkeley.edu
Address: Astronomy Department, 601 Campbell Hall, Berkeley, CA 94720, USA

CoI: Adam Leroy, University of California at Berkeley
CoI: Alberto Bolatto, University of California at Berkeley
CoI: Leo Blitz, University of California at Berkeley

Title: A High-Resolution Kinematic Study of the Low Mass Spiral NGC 4605

Abstract: We propose to follow up our previous rotation-curve study of the nearby dwarf galaxy NGC 4605 with integral field optical spectroscopy at the WIYN telescope. We will use the DensePak array at its highest resolution (~ 13 km/s) to map the extensive \ha emission in this galaxy. With this optical datacube, our existing CO velocity field, and our \hi observations (in progress at the VLA), we will be able to study the internal kinematics of NGC 4605 with 3-5\arcsec (60-100 pc) angular resolution and 0.5-3 km/s velocity uncertainties. The DensePak data will represent a dramatic improvement over our previous work; both the signal-to-noise ratio and the number of independent velocity data points will increase by at least an order of magnitude. There are a number of questions about NGC 4605 that we will address with these new data, including 1) will the full velocity field reveal that the position angle and/or inclination angle vary with radius, and if so, is there an effect on the derived density profile?, 2) is the ~10 km/s discrepancy between the CO and longslit \ha rotation curves real, and if so, what is its cause?, and 3) is there a large (30\arcdeg) offset between the photometric and kinematic position angles, as is suggested by the CO data, or are there significant radial motions present?


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 >   2003A-0289

noaoprop-help@noao.edu

Small NOAO Logo