Modeling Noncircular Motions in Disk Galaxies: Application to NGC 2976
نویسندگان
چکیده
منابع مشابه
Non - Circular Motions in Disk Galaxies : Application to Ngc 2976
We present a new procedure to fit non-axisymmetric flow patterns to 2-D velocity maps of spiral galaxies. We concentrate on flows caused by bar-like or oval distortions to the total potential that may arise either from a non-axially symmetric halo or a bar in the luminous disk. We apply our method to high-quality CO and Hα data for the nearby, low-mass spiral NGC 2976 previously obtained by Sim...
متن کاملModeling Non - Circular Motions in Disk Galaxies : Application to Ngc 2976
We present a new procedure to fit non-axisymmetric flow patterns to 2-D velocity maps of spiral galaxies. We concentrate on flows caused by bar-like or oval distortions to the total potential that may arise either from a non-axially symmetric halo or a bar in the luminous disk. We apply our method to high-quality CO and Hα data for the nearby, low-mass spiral NGC 2976 previously obtained by Sim...
متن کاملar X iv : 0 70 8 . 28 52 v 1 [ as tr o - ph ] 2 1 A ug 2 00 7 Modeling Non - Circular Motions in Disk Galaxies : A Bar in NGC 2976
We give a brief description of a new model for non-circular motions in disk galaxy velocity fields, that does not invoke epicycles. We assume non-circular motions to stem from a bar-like or oval distortion to the potential, as could arise from a triaxial halo or a bar in the mass distribution of the baryons. We apply our model to the high-quality CO and Hα kinematics of NGC 2976 presented by [5...
متن کاملPrecision Velocity Fields in Spiral Galaxies. I. Noncircular Motions and Rms Noise in Disks
Investigation of the symmetry of the majorand minor-axis rotation curves reveals strong evidence of nonconcentric gas orbits with the maximum center shift of D300 pc. Comparisons between kinematic and photometric structure (e.g., position angles, inclinations, centers) show considerable noise on small scales. Although large-scale averages are in agreement, this noise is a matter of some concern...
متن کاملHigh-resolution Measurements of the Dark Matter Halo of Ngc 2976: Evidence for a Shallow Density Profile
We have obtained two-dimensional velocity fields of the dwarf spiral galaxy NGC 2976 in Hα and CO. The high spatial (∼ 75 pc) and spectral (13 km s and 2 km s, respectively) resolution of these observations, along with our multicolor optical and near-infrared imaging, allow us to measure the shape of the density profile of the dark matter halo with good precision. We find that the total (baryon...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2007
ISSN: 0004-637X,1538-4357
DOI: 10.1086/518471