A novel approach for calculating galaxy rotation curves using spaxel cross-correlation and iterative smoothing
Bag S. Shafieloo A. Smith R. Chung H. Linder E.V. Park C. Abylkairov Y.S. Yelshibekov K.
1 August 2022Oxford University Press
Monthly Notices of the Royal Astronomical Society
2022#514Issue 22278 - 2297 pp.
Precise measurements of the internal dynamics of galaxies have proven of great importance for understanding the internal dark matter distribution of galaxies. We present a novel method for measuring the line-of-sight (LOS) velocities across the face of galaxies by cross-correlation of spectral pixels (spaxels) and an iterative method of smoothing. On simulated data the method can accurately recover the input LOS velocities for different types of spectra (absorption-line dominated, emission-line dominated, and differing shapes of the continuum), and can handle stellar population radial gradients. Most important of all, it continues to provide reliable measurements of LOS velocities with reasonable uncertainties even when the spectra are very low signal-To-noise ratio (approaching ∼1), which is a challenge for traditional template-fitting approaches. We apply our method to data from a real MaNGA galaxy as a demonstration and find promising results with good precision. This novel approach can be complementary to existing methods primarily based on template fitting.
Galaxy: Kinematics and dynamics , Methods: Data analysis , Methods: Statistical
Text of the article Перейти на текст статьи
Korea Astronomy and Space Science Institute, Daejeon, 34055, South Korea
University of Science and Technology, Daejeon, 34113, South Korea
Departamento de Fisica, Universidad TCrossed D sign©cnica Federico Santa Mari_auth, Avenida Vicuña Mackenna, San Joaquin, 3939, Chile
University of Arizona, Steward Observatory, 933 N Cherry Ave, Tucson, 85721, AZ, United States
Berkeley Center for Cosmological Physics, University of California, Berkeley, 94720, CA, United States
Lawrence Berkeley National Laboratory, Berkeley, 94720, CA, United States
Energetic Cosmos Laboratory, Nazarbayev University, Nur-Sultan, 010000, Kazakhstan
School of Physics, Korea Institute for Advanced Study, Seoul, 02455, South Korea
Department of Physics, University of California San Diego, La Jolla, San Diego, 92093, CA, United States
Korea Astronomy and Space Science Institute
University of Science and Technology
Departamento de Fisica
University of Arizona
Berkeley Center for Cosmological Physics
Lawrence Berkeley National Laboratory
Energetic Cosmos Laboratory
School of Physics
Department of Physics
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026