The Most Completely Sampled Rotation Curves for Galaxies

Abstract

view Abstract Citations (144) References (53) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Most Completely Sampled Rotation Curves for Galaxies Sofue, Yoshiaki Abstract We have compiled high-resolution position-velocity diagrams observed along the major axes of nearby spiral galaxies in the CO line emission, and derived rotation curves for the inner regions of the galaxies. We have combined the inner rotation curves with the outer H I and optical rotation curves to obtain the total rotation curves. The inner rotation curves are characterized by a steep increase within a radius of a few hundred parsecs, indicating a compact massive concentration near the nucleus. We fit the obtained rotation curves for individual galaxies by a modified Miyamoto-Nagai potential by assuming existence of four mass components: a nuclear mass component with a scale radius of 100-150 pc and a mass of ∼3-5 × 109 Msun a central bulge of 0.5-1 kpc radius of mass ∼1010 Msun; a disk with scale radius 5-7 kpc and thickness 0.5 kpc of mass ∼1-2 × 1011 Msun and a massive halo of scale radius 15-20 kpc with a mass ∼2-3 × 1011 Msun. We discuss the implication of the nuclear compact mass component for the formation mechanism of multiple structures within the central bulge of a galaxy during its formation. Publication: The Astrophysical Journal Pub Date: February 1996 DOI: 10.1086/176796 arXiv: arXiv:astro-ph/9507098 Bibcode: 1996ApJ...458..120S Keywords: GALAXIES: KINEMATICS AND DYNAMICS; GALAXIES: ISM; Astrophysics E-Print: Plain TEX, 16 pages, Figures on request, to appear in ApJ full text sources arXiv | ADS | data products SIMBAD (9) NED (9)