H I distribution and kinematics in the peculiar spiral galaxy NGC 5474

Abstract

view Abstract Citations (43) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS HI Distribution and Kinematics in the Peculiar Spiral Galaxy NGC 5474 Rownd, B. K. ; Dickey, J. M. ; Helou, G. Abstract We present a detailed study of the distribution and kinematics of neutral hydrogen in the peculiar small spiral galaxy NGC 5474. Our VLA D-array observations show that its extended H I disk has a clumpy structure. The H I velocity field indicates that the galaxy `s gas disk is in normal differential rotation, with a pronounced warp developing beyond the bright optical disk. We confirm the observation of van der Hulst & Huchtmeier [A&A,78,82 (1979)] that the optical feature resembling a nuclear bulge is offset from the kinematic center of the galaxy. NGC 5474's very low inclination allows us to study the z motions of its H I disk. With our 5.2 km s' spectral resolution we find the z velocity distribution to be adequately represented by a single Gaussian component. Thus, there is no detectable population of high velocity clouds, nor is there any ordered pattern of velocity residuals about the best fit differential rotation model. Our interpretation is that the gravitational field of nearby M101 strips off the fountain gas before it has time to recombine and fall back toward NGC 5474. Thus, the bridge between M 101 and NGC 5474 is in part populated by the missing high- and intermediate- velocity clouds of NGC 5474. Publication: The Astronomical Journal Pub Date: November 1994 DOI: 10.1086/117185 Bibcode: 1994AJ....108.1638R Keywords: Astronomical Maps; Astronomical Models; Galactic Evolution; Gas Dynamics; H I Regions; H Lines; Hydrogen Atoms; Interacting Galaxies; Interstellar Gas; Neutral Gases; Rotating Fluids; Spiral Galaxies; Astronomical Spectroscopy; Galactic Bulge; Stellar Luminosity; Velocity Distribution; Very Large Array (Vla); Astronomy; GALAXIES: INDIVIDUAL: NGC 5474; GALAXIES: ELLIPTICAL AND LENTICULAR; GALAXIES: PECULIAR full text sources ADS | data products SIMBAD (3) NED (1)